Remove ChangeLog entry for 4610ab9d9 as it I had to revert it

[privoxy.git] / ChangeLog

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ChangeLog for Privoxy
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*** Version 3.0.34 stable ***

- Bug fixes:
  - Improve the handling of chunk-encoded responses by buffering the data
    even if filters are disabled and properly keeping track of where the
    various chunks are supposed to start and end. Previously Privoxy would
    merely check the last bytes received to see if they looked like the
    last-chunk. This failed to work if the last-chunk wasn't received in one
    read and could also result in actual data being misdetected
    as last-chunk.
    Should fix: SF support request #1739
    Reported by: withoutname
  - remove_chunked_transfer_coding(): Refuse to de-chunk invalid data
    Previously the data could get corrupted even further.
    Now we simply pass the unmodified data to the client.
  - gif_deanimate(): Tolerate multiple image extensions in a row.
    This allows to deanimate all the gifs on:
    https://commons.wikimedia.org/wiki/Category:Animated_smilies
    Fixes SF bug #795 reported by Celejar.
  - OpenSSL generate_host_certificate(): Use X509_get_subject_name()
    instead of X509_get_issuer_name() to get the issuer for generated
    website certificates so there are no warnings in the browser when using
    an intermediate CA certificate instead of a self-signed root certificate.
    Problem reported and patch submitted by Chakib Benziane.
  - can_filter_request_body(): Fix a log message that contained a spurious u.
  - handle_established_connection(): Check for pending TLS data from the client
    before checking if data is available on the connection.
    The TLS library may have already consumed all the data from the client
    response in which case poll() and select() will not detect that data is
    available to be read.
    Sponsored by: Robert Klemme
  - ssl_send_certificate_error(): Don't crash if there's no certificate
    information available. This is only relevant when Privoxy is built with
    wolfSSL 5.0.0 or later (code not yet published). Earlier wolfSSL versions
    or the other TLS backends don't seem to trigger the crash.
  - socks5_connect(): Add support for target hosts specified as IPv4 address
    Previously the IP address was sent as domain.

- General improvements:
  - Add a client-body-tagger action which creates tags based on
    the content of the request body.
    Sponsored by: Robert Klemme
  - When client-body filters are enabled, buffer the whole request
    before opening a connection to the server.
    Makes it less likely that the server connection times out
    and we don't open a connection if the buffering fails anyway.
    Sponsored by: Robert Klemme
  - Add periods to a couple of log messages.
  - accept_connection(): Add missing space to a log message.
  - Initialize ca-related defaults with strdup_or_die() so errors
    aren't silently ignored.
  - make_path: Use malloc_or_die() in cases where allocation errors
    were already fatal anyway.
  - handle_established_connection(): Improve an error message slightly.
  - receive_client_request(): Reject https URLs without CONNECT request.
  - Include all requests in the statistics if mutexes are available.
    Previously in case of reused connections only the last request got
    counted. The statistics still aren't perfect but it's an improvement.
  - Add read_socks_reply() and start using it in socks5_connect()
    to apply the socket timeout more consistently.
  - socks5_connect(): Deal with domain names in the socks reply
  - Add a filter for bundeswehr.de

- Action file improvements:
  - Disable filter{banners-by-size} for .freiheitsfoo.de/
  - Disable filter{banners-by-size} for freebsdfoundation.org/
  - Disable fast-redirects for consent.youtube.com/
  - Block requests to ups.xplosion.de/
  - Block requests for elsa.memoinsights.com/t
  - Fix a typo in a test.
  - Disable fast-redirects for launchpad.net/
  - Unblock .eff.org/
  - Stop unblocking .org/.*(image|banner) which appears to be too generous
    It let requests like:
    https://stats.noblogs.org/piwik.php?action_name=anti%20gentrifizierungs%20fest&idsite=10175&rec=1&r=220192&h=17&m=7&s=44&url=https%3A%2F%2Fmuellemcalling.noblogs.org%2F&urlref=https%3A%2F%2Fmuellemcalling.noblogs.org%2Finfostande%2F&_id=&_idn=1&_refts=0&send_image=0&cookie=1&res=1366x768&pv_id=eqr7jX&pf_net=7&pf_srv=3&pf_tfr=2281&pf_dm1=156
    pass.
    The example URL http://www.gnu.org/graphics/gnu-head-banner.png is
    already unblocked due to .gnu.org being unblocked.
  - Unblock adfd.org/
  - Disable filter{banners-by-link} for .eff.org/
  - Block requests to odb.outbrain.com/
  - Disable fast-redirects for .gandi.net/
  - Disable fast-redirects{} for .onion/.*/status/
  - Disable fast-redirects{} for twitter.com/.*/status/
  - Unblock pinkstinks.de/
  - Disable fast-redirects for .hagalil.com/

- Privoxy-Log-Parser:
  - Bump version to 0.9.5.
  - Highlight more log messages.
  - Highlight the Crunch reason only once. Previously the "crunch reason"
    could also be highlighted when the URL contained a matching string.
    The real crunch reason only occurs once per line, so there's no need
    to continue looking for it after it has been found once.
    While at it, add a comment with an example log line.

- uagen:
  - Update BROWSER_VERSION and BROWSER_REVISION to 102.0
    to match the User-Agent of the current Firefox ESR.
  - Explicitly document that changing the 'Gecko token' is suspicious.
  - Consistently use a lower-case 'c' as copyright symbol.
  - Bump copyright.
  - Add 'aarch64' as Linux architecture.
  - Add OpenBSD architecture 'arm64'.
  - Stop using sparc64 as FreeBSD architecture.
    It hasn't been supported for a while now.
  - Bump version.

- Build system:
  - Makefile: Add a 'dok' target that depends on the 'error' target
    to show the "You are not using GNU make or did nor run configure"
    message.
  - configure: Fix --with-msan option.
    Also (probably) reported by Andrew Savchenko.

- Documentation:
  - Add OpenSSL to the list of libraries that may be licensed under the
    Apache 2.0 license in which case the linked Privoxy binary has to be
    distributed under the GPLv3 or later.
  - config: Fix the documented ca-directory default value
    Reported by avoidr.
  - Rebuild developer-manual and tidy with 'HTML Tidy for FreeBSD version 5.8.0'
  - Update developer manual with new macOS packaging instructions.

*** Version 3.0.33 stable ***
- Security/Reliability:
  - cgi_error_no_template(): Encode the template name to prevent
    XSS (cross-site scripting) when Privoxy is configured to servce
    the user-manual itself.
    Commit 0e668e9409c. OVE-20211102-0001. CVE-2021-44543.
    Reported by: Artem Ivanov
  - get_url_spec_param(): Free memory of compiled pattern spec
    before bailing.
    Reported by Joshua Rogers (Opera) who also provided the fix.
    Commit 652b4b7cb0. OVE-20211201-0003. CVE-2021-44540.
  - process_encrypted_request_headers(): Free header memory when
    failing to get the request destination.
    Reported by Joshua Rogers (Opera) who also provided the fix.
    Commit 0509c58045. OVE-20211201-0002. CVE-2021-44541.
  - send_http_request(): Prevent memory leaks when handling errors
    Reported by Joshua Rogers (Opera) who also provided the fix.
    Commit c48d1d6d08. OVE-20211201-0001. CVE-2021-44542.

- Bug fixes:
  - handle_established_connection(): Skip the poll()/select() calls
    if TLS data is pending on the server socket. The TLS library may
    have already consumed all the data from the server response in
    which case poll() and select() will not detect that data is
    available to be read.
    Fixes SF bug #926 reported by Wen Yue.
  - continue_https_chat(): Update csp->server_connection.request_sent
    after sending the request to make sure the latency is calculated
    correctly. Previously https connections were not reused after
    timeout seconds after the first request made on the connection.
  - free_pattern_spec(): Don't try to free an invalid pointer
    when unloading an action file with a TAG pattern while
    Privoxy has been compiled without FEATURE_PCRE_HOST_PATTERNS.
    Closes: SF patch request #147. Patch by Maxim Antonov.
  - Adjust build_request_line() to create a CONNECT request line when
    https-inspecting and forwarding to a HTTP proxy.
    Fixes SF bug #925 reported by Wen Yue.
  - load_config(): Add a space that was missing in a log message.
  - read_http_request_body(): Fix two error messages that used an
    incorrect variable.
  - If the the response is chunk-encoded, ignore the Content-Length
    header sent by the server.
    Allows to load https://redmine.lighttpd.net/ with filtering enabled.

- General improvements:
  - Allow to edit the add-header action through the CGI editor by
    generalizing the code that got added with the suppress-tag action.
    Closes SF patch request #146. Patch by Maxim Antonov.
  - Add a CGI handler for /wpad.dat that returns a
    Proxy Auto-Configuration (PAC) file.
    Among other things, it can be used to instruct clients
    through DHCP to use Privoxy as proxy.
    For example with the dnsmasq option:
    dhcp-option=252,http://config.privoxy.org/wpad.dat
    Initial patch by Richard Schneidt.
  - Don't log the applied actions in process_encrypted_request()
    Log them in continue_https_chat() instead to mirror chat().
    Prevents the applied actions from getting logged twice
    for the first request on an https-inspected connection.
  - OpenSSL generate_host_certificate(): Use config.privoxy.org as Common Name
    Org and Org Unit if the real host name is too long to get accepted by OpenSSL.
    Clients should only care about the Subject Alternative Name
    anyway and we can continue to use the real host name for it.
    Reported by Miles Wen on privoxy-users@.
  - Establish the TLS connection with the client earlier and decide
    how to route the request afterwards. This allows to change the
    forwarding settings based on information from the https-inspected
    request, for example the path.
  - listen_loop(): When shutting down gracefully, close listening ports
    before waiting for the threads to exit. Allows to start a second
    Privoxy with the same config file while the first Privoxy is still
    running.
  - serve(): Close the client socket as well if the server socket
    for an inspected connection has been closed. Privoxy currently
    can't establish a new server connection when the client socket
    is reused and would drop the connection in continue_https_chat()
    anyway.
  - Don't disable redirect checkers in redirect_url().
    Disable them in handle_established_connection() instead.
    Doing it in redirect_url() prevented the +redirect{} and
    +fast-redirects{} actions from being logged with LOG_LEVEL_ACTIONS.
  - handle_established_connection(): Slightly improve a comment.
  - handle_established_connection(): Fix a comment.
  - socks5_connect(): Fix indentation.
  - handle_established_connection(): Improve an error message.
  - create_pattern_spec(): Fix ifdef indentation.
  - Fix comment typos.
  - process_encrypted_request(): Improve a log message.
    The function only processes request headers and there
    may still be unread request body data left to process.
  - chat(): Log the applied actions before deciding how to forward the request.
  - parse_time_header(): Silence a coverity complaint when building without assertions.
  - receive_encrypted_request_headers(): Improve a log message.
  - mbedTLS get_ciphersuites_from_string(): Use strlcpy() instead of strncpy().
    Previously the terminating NUL wasn't copied which resulted
    in a compiler warning. This didn't cause actual problems as
    the target buffer was initialized by zalloc_or_die() so the
    last byte of the target buffer was NUL already.
    Actually copying the terminating NUL seems clearer, though.
  - Remove compiler warnings. "log_error(LOG_LEVEL_FATAL, ..."
    doesn't return but apparently the compiler doesn't know that.
    Get rid of several "this statement may fall through
    [-Wimplicit-fallthrough=]" warnings.
  - Store the PEM certificate in a dynamically allocated buffer
    when https-inspecting. Should prevent errors like:
    2021-03-16 22:36:19.148 7f47bbfff700 Error: X509 PEM cert len 16694 is larger than buffer len 16383
    As a bonus it should slightly reduce the memory usage as most
    certificates are smaller than the previously used fixed buffer.
    Reported by: Wen Yue
  - OpenSSL generate_host_certificate(): Fix two error messsages.
  - Improve description of handle_established_connection()
  - OpenSSL ssl_store_cert(): Translate EVP_PKEY_EC to a string.
  - OpenSSL ssl_store_cert(): Remove pointless variable initialization.
  - OpenSSL ssl_store_cert(): Initialize pointer with NULL instead of 0.

- Action file improvements:
  - Disable fast-redirects for .microsoftonline.com/.
  - Disable fast-redirects for idp.springer.com/.
  - Disable fast-redirects for .zeit.de/zustimmung.
  - Unblock adv-archiv.dfn-cert.de/.
  - Block requests to eu-tlp01.kameleoon.eu/.
  - Block requests to fpa-events.arstechnica.com/.
  - Unblock nlnet.nl/.
  - Unblock adguard.com/.

- Privoxy-Log-Parser:
  - Highlight 'Socket timeout 3 reached: http://127.0.0.1:20000/no-filter/chunked-content/36'.
  - Improve documentation for inactivity-detection mode.
  - Detect date changes when looking for inactivity.
  - Add a --passed-request-statistics-threshold option
    that can be set to get statistics for requests that
    were passed.
  - Add a "inactivity detection" mode which can be useful
    for debugging purposes.
  - Bump version to 0.9.4.
  - Only run print_intro() and print_outro() when syntax highlighting.
  - Rephrase a sentence in the documentation.
  - Highlight 'Client socket 7 is no longer usable. The server socket has been closed.'.
  - Clarify --statistics output by explicitly mentioning that
    the status codes sent by the server may differ from the ones
    in "debug 512" messages.
  - Fix typo in the --statistics output.
  - Remove an unused variable.
  - Highlight 'The peer notified us that the connection on socket 11 is going to be closed'.

- Privoxy-Regression-Test:
  - Remove duplicated word in a comment.

- regression-tests.action:
  - Add fetch test for http://p.p/wpad.dat.
  - Bump for-privoxy-version to 3.0.33 which introduced the wpad.dat support.
  - Add more tests for the '/send-banner' code.
  - Add test for OVE-20210203-0001.
  - Add a test for CVE-2021-20217.

- uagen:
  - Bump generated Firefox version to 91 (ESR).
  - Bump version to 1.2.3.
  - Bump copyright.

- Build system:
  - configure: Bump SOURCE_DATE_EPOCH.
  - GNUmakefile.in: Fix typo.
  - configure: Add another warning in case --disable-pthread
    is used while POSIX threads are available.
    Various features don't even compile when not using threads.
  - Add configure option to enable MemorySanitizer.
  - Add configure option to enable UndefinedBehaviorSanitizer.
  - Add configure option to enable AddressSanitizer.
  - Bump copyright.
  - Add a configure option to disable pcre JIT compilation.
    While JIT compilation makes filtering faster it can
    cause false-positive valgrind complaints.
    As reported by Gwyn Ciesla in SF bug 924 it also can
    cause problems when the SELinux policy does not grant
    Privoxy "execmem" privileges.
  - configure: Remove obsolete RPM_BASE check.

- Windows build system:
  - Update the build script to use mbed tls version 2.6.11.
  - Update build script to use the final 8.45 pcre library.
  - Put all the '--enable-xxx' options in the configure call together.

- macOS build system:
  - The OSXPackageBuilder repository has been updated and
    can be used to create macOS packages again.

- Documentation:
  - contacting: Remove obsolete reference to announce.sgml.
  - contacting: Request that the browser cache is cleared before
    producing a log file for submission.
  - Sponsor FAQ: Note that Privoxy users may follow sponsor links
    without Referer header set.
  - newfeatures: Clarify that https inspection also allows to
    filter https responses.
  - developer-manual: Mention that announce.txt should be updated
    when doing a release.
  - config: Explicitly mention that the CGI pages disclosing the
    ca-password can be blocked and upgrade the disclosure paragraphs
    to a warning.
  - Put all the requested debug options in the config file.
    Section 11.1 of the Privoxy user manual lists all the debug
    options that should be enabled when reporting problems or requesting support.
    Make it easier for users to do the right thing by having all those
    options present in the config.
  - Update TODO list item #184 to note that WolfSSL support will
    (hopefully) appear after the 3.0.34 release.
  - Update max-client-connections's description.
    On modern systems other than Windows Privoxy should
    use poll() in which case the FD_SETSIZE value isn't
    releveant.
  - Add a warning that the socket-timeout does not apply
    to operations done by TLS libraries.
  - Make documentation slightly less "offensive" for some people
    by avoiding the word "hell".

*** Version 3.0.32 stable ***

- Security/Reliability:
  - ssplit(): Remove an assertion that could be triggered with a
    crafted CGI request.
    Commit 2256d7b4d67. OVE-20210203-0001. CVE-2021-20272.
    Reported by: Joshua Rogers (Opera)
  - cgi_send_banner(): Overrule invalid image types. Prevents a
    crash with a crafted CGI request if Privoxy is toggled off.
    Commit e711c505c48. OVE-20210206-0001. CVE-2021-20273.
    Reported by: Joshua Rogers (Opera)
  - socks5_connect(): Don't try to send credentials when none are
    configured. Fixes a crash due to a NULL-pointer dereference
    when the socks server misbehaves.
    Commit 85817cc55b9. OVE-20210207-0001. CVE-2021-20274.
    Reported by: Joshua Rogers (Opera)
  - chunked_body_is_complete(): Prevent an invalid read of size two.
    Commit a912ba7bc9c. OVE-20210205-0001. CVE-2021-20275.
    Reported by: Joshua Rogers (Opera)
  - Obsolete pcre: Prevent invalid memory accesses with an invalid
    pattern passed to pcre_compile(). Note that the obsolete pcre code
    is scheduled to be removed before the 3.0.33 release. There has been
    a warning since 2008 already.
    Commit 28512e5b624. OVE-20210222-0001. CVE-2021-20276.
    Reported by: Joshua Rogers (Opera)

- Bug fixes:
  - Properly parse the client-tag-lifetime directive. Previously it was
    not accepted as an obsolete hash value was being used.
    Reported by: Joshua Rogers (Opera)
  - decompress_iob(): Prevent reading of uninitialized data.
    Reported by: Joshua Rogers (Opera).
  - decompress_iob(): Don't advance cur past eod when looking
    for the end of the file name and comment.
  - decompress_iob(): Cast value to unsigned char before shifting.
    Prevents a left-shift of a negative value which is undefined behaviour.
    Reported by: Joshua Rogers (Opera)
  - gif_deanimate(): Confirm that that we have enough data before doing
    any work. Fixes a crash when fuzzing with an empty document.
    Reported by: Joshua Rogers (Opera).
  - buf_copy(): Fail if there's no data to write or nothing to do.
    Prevents undefined behaviour "applying zero offset to null pointer".
    Reported by: Joshua Rogers (Opera)
  - log_error(): Treat LOG_LEVEL_FATAL as fatal even when --stfu is
    being used while fuzzing.
    Reported by: Joshua Rogers (Opera).
  - Respect DESTDIR when considering whether or not to install
    config files with ".new" extension.
  - OpenSSL ssl_store_cert(): Fix two error messages.
  - Fix a couple of format specifiers.
  - Silence compiler warnings when compiling with NDEBUG.
  - fuzz_server_header(): Fix compiler warning.
  - fuzz_client_header(): Fix compiler warning.
  - cgi_send_user_manual(): Also reject requests if the user-manual
    directive specifies a https:// URL. Previously Privoxy would try and
    fail to open a local file.

- General improvements:
  - Log the TLS version and the the cipher when debug 2 is enabled.
  - ssl_send_certificate_error(): Respect HEAD requests by not sending a body.
  - ssl_send_certificate_error(): End the body with a single new line.
  - serve(): Increase the chances that the host is logged when closing
    a server socket.
  - handle_established_connection(): Add parentheses to clarify an expression
    Suggested by: David Binderman
  - continue_https_chat(): Explicitly unset CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE
    if process_encrypted_request() fails. This makes it more obvious that the
    connection will not be reused. Previously serve() relied on
    CSP_FLAG_SERVER_CONTENT_LENGTH_SET and CSP_FLAG_CHUNKED being unset.
    Inspired by a patch from Joshua Rogers (Opera).
  - decompress_iob(): Add periods to a couple of log messages
  - Terminate the body of the HTTP snipplets with a single new line
    instead of "\r\n".
  - configure: Add --with-assertions option and only enable assertions
    when it is used
  - windows build: Use --with-brotli and --with-mbedtls by default and
    enable dynamic error checking.
  - gif_deanimate(): Confirm we've got an image before trying to write it
    Saves a pointless buf_copy() call.
  - OpenSSL ssl_store_cert(): Remove a superfluous space before the serial number.

- Action file improvements:
  - Disable fast-redirects for .golem.de/
  - Unblock requests to adri*.
  - Block requests for trc*.taboola.com/
  - Disable fast-redirects for .linkedin.com/

- Filter file improvements:
  - Make the second pcrs job of the img-reorder filter greedy again.
    The ungreedy version broke the img tags on:
    https://bulk.fefe.de/scalability/.

- Privoxy-Log-Parser:
  - Highlight a few more messages.
  - Clarify the --statistics output. The shown "Reused connections"
    are server connections so name them appropriately.
  - Bump version to 0.9.3.

- Privoxy-Regression-Test:
  - Add the --check-bad-ssl option to the --help output.
  - Bump version to 0.7.3.

- Documentation:
  - Add pushing the created tag to the release steps in the developer manual.
  - Clarify that 'debug 32768' should be used in addition to the other debug
    directives when reporting problems.
  - Add a 'Third-party licenses and copyrights' section to the user manual.

*** Version 3.0.31 stable ***

- Security/Reliability:
  - Prevent an assertion from getting triggered by a crafted CGI request.
    Commit 5bba5b89193fa. OVE-20210130-0001. CVE-2021-20217.
    Reported by: Joshua Rogers (Opera)
  - Fixed a memory leak when decompression fails "unexpectedly".
    Commit f431d61740cc0. OVE-20210128-0001. CVE-2021-20216.

- Bug fixes:
  - Fixed detection of insufficient data for decompression.
    Previously Privoxy could try to decompress a partly
    uninitialized buffer.

*** Version 3.0.30 stable ***

- Bug fixes:
  - Check the actual URL for redirects when https inspecting requests.
    Previously Privoxy would only check the path which resulted in
    rewrite results being rejected as invalid URLs.
    Reported by withoutname in #1736.
  - Let the hide-referrer code tolerate Referer headers with https:// URLs.
    Previously they would always be treated like a changed host.
  - Use the https headers if the show-request handler is reached through
    https://. Previously Privoxy would use the http headers which
    may be empty on a reused connection.
  - Make CGI_PREFIX protocol-relative when building with FEATURE_HTTPS_INSPECTION.
    This unbreaks (at least) https://config.privoxy.org/client-tags whose
    buttons would previously use a http:// URL resulting in browser warnings.
  - Support using https-inspection and client-header-order at the same time.
    Previously Privoxy would crash.
    Reported by: Kai Raven
  - Properly reject rewrites from http to https as they currently
    aren't supported. Previously Privoxy would wait for the client
    to establish an encrypted connection which obviously would not happen.
  - When https inspection is enabled and Privoxy has been compiled with
    FEATURE_GRACEFUL_TERMINATION (not recommended for production builds),
    the TLS backend resources are free'd later on and only if no active
    connections are left. Prevents crashes when exiting "gracefully" at the
    wrong time.
  - Let the uninstall target remove the config file even if DESTDIR
    is set and properly announce the deletion of the configuration files.

- General improvements:
  - Allow to rewrite the request destination for https-inspected
    requests behind the client's back. The documentation already sort
    of claimed that it was supported by not especially mentioning that
    it didn't work for https-inspected requests.
    Fixes SF bug #923 reported by withoutname.
  - Add support for filtering client request bodies by using
    CLIENT-BODY-FILTER filters which can be enabled with the
    client-body-filter action.
    Patch submitted by Maxim Antonov.
    Sponsored by: Robert Klemme
  - Add the new action suppress-tag{} which can be used to prevent
    a tagger from adding a tag. Patch submitted by Maxim Antonov.
    Sponsored by: Robert Klemme
  - Gracefully handle existing website keys without matching certificates.
    This can happen if Privoxy was previously running with an invalid
    TLS configuration that didn't allow it to create a certificate.
  - Recycle debug bit 4 for Tagging-related messages.
  - Improve the message shown when the client-tags CGI page
    is requested with no tags configured.
  - Shorten the 'donate' and 'participate' links used by templates
    using redirects. Currently the redirects lead to the FAQ entries
    but in the future we may want to relocate the content and using
    redirects makes this more convenient.
  - Log an error when a PCRE-HOST-PATTERN is used with
    FEATURE_PCRE_HOST_PATTERNS disabled. Don't treat this a
    fatal error so the regression tests can be used with and
    without FEATURE_PCRE_HOST_PATTERNS.
  - The code compiles with older C compilers again.
  - The chdir() return code is checked to fix a compiler warning.
  - The packages feed has been removed from the source tarball.
    It's usually out of date when the source tarball is generated
    for the release.
  - Fixed harmless compiler warnings from GCC9 with -D_FORTIFY_SOURCE=2.
  - windows: Remove obsolete '$(DEST)/doc/images' target.
  - windows: Install the images referenced in the user manual.
  - Remove obsolete 'gnu_regex.@OBJEXT@' target.
  - When installing from the GNUMAkefile, don't create an 'images'
    directory which is no longer used. The images were relocated to
    the user-manual directory years ago.
  - Add new FEATURES to the show-status page and resort list.
  - Remove unused variable in the OpenSSL-specific code.
  - Update bug tracker URL in cgi_error_unknown().
  - Saved a couple of memory allocations when sorting client headers.
  - Improved a couple of error messages.
  - Saved memory allocations when using OpenSSL and checking if a
    key already exists.
  - The configure script will bail out if OpenSSL and mbedTLS are
    enabled at the same time.
  - Log a message right before exiting gracefully.
  - A couple of structures have been rearranged to require slightly
    less memory.
  - When https inspection is enabled and the certificate is invalid
    the error message is now sent with status code 403 instead of 200.
  - The Slackware rc script template has been renamed to
    slackware/rc.privoxy.in to silence complaints when building
    Debian packages.
  - When building with MbedTLS support, mbedtls_md5_ret() is used
    instead of mbedtls_md5() which is deprecated and causes a warning
    on Debian GNU/Linux.

- Action file improvements:
  - Block requests to eu-tlp03.kameleoon.com/.
  - Unblock metrics.sr.ht/.
  - Disable fast-redirects for .fsf.org/.
  - Disable fast-redirects for .gravater.com/.
  - Disable fast-redirects for .ksta.de/.
  - Block requests to tag.crsspxl.com/.
  - Block requests to analytics.slashdotmedia.com/.
  - Block requests to ml314.com/.
  - Block requests to .adroll.com/.
  - Block requests to fastlane.rubiconproject.com/.
  - Block requests to api.theadex.com/.
  - Block requests to ih.adscale.de/.
  - Block requests to .s400.meetrics.net/.
  - Block requests for pp.lp4.io/.
  - Block requests for trc-events.taboola.com/.

- Filter file improvements:
  - A allow-autocompletion filter has been added which changes
    autocomplete="off" to "on" on input fields to allow autocompletion.
    Requested by Jamie Zawinski in #370.
    Filter based on a submission by Aaron Linville.
  - Added an imdb filter.
  - Added a sourceforge filter that reduces the amount of ads
    for proprietary software.
  - Added a github filter that removes the annoying "Sign-Up"
    banner and the Cookie disclaimer.
  - Removed a duplicated pcrs command from the js-annoyances filter.
  - The crude-parental filter now provides a short reason when blocking,
    inserts a link to Privoxy's webinterface and adds a new line at
    the end of the generated page.

- Privoxy-Log-Parser:
  - Highlight a few more messages.
  - Add a handler for tagging messages.
  - Properly deal with 'Certificate error' crunches
    Previously the error description was highlighted as 'host'.
  - Log truncated LOG_LEVEL_CLF messages more gracefully
    and note that the statistics will be imprecise.
  - Fixed perldoc typo.
  - Bump version to 0.9.2.

- Privoxy-Regression-Test:
  - Use http://127.0.0.1:8118/ as default Privoxy address
    unless http_proxy is set through the environment.
  - Add a --privoxy-cgi-prefix option that specifies the prefix
    to use when building URLs that are supposed to reach Privoxy's
    CGI interface. If it's not set, http://p.p/ is used, which is
    supposed to work with the default Privoxy configuration.
    If Privoxy has been built with FEATURE_HTTPS_INSPECTION enabled,
    and if https inspection is activated with the +https-inspection
    action, this option can be used with "https://p.p/" provided the
    system running Privoxy-Regression-Test has been configured to
    trust the certificate used by Privoxy.
    Note that there are currently two tests in the official
    regression-tests.action file that are expected to fail
    when using "https://p.p/" as privoxy-cgi-prefix.
  - Skip the connection-established response in get_status_code()
    when looking for the status code with a CGI prefix
    that starts with https://. We care about the status code
    sent by the impersonated web server.
  - Use --proxy-header when using a CGI prefix with https://
    and a "Host:" header.
  - Allow '|' in tokens and values to allow tag patterns like
    "TAG:^(application|text)/(x-)?javascript$".
  - When get_cgi_page_or_else() fails, include the URL of the
    requested page in the log message.
  - Added a --check-bad-ssl option that can be used to verify that
    Privoxy detects certificate problems when accessing the test
    sites from badssl.com.
  - Bumped version to 0.7.2

- uagen:
  - Update example output.
  - Recommend the use of the https-inspection action in the documentation.
  - Upgrade a couple of URLs to https://.
  - Add ElectroBSD to the list of operating systems.
  - Bumped generated Firefox version to 78 (ESR).
  - Bumped version to 1.2.2.

 - User documentation:
  - Remove reference to 'How to Report Bugs Effectively'.
    It was only rendered as text without URL in the README anyway
    and there's no indication that users read it ...
  - Let the dok-readme target fix the location embedded into the
    README file. This used to be done by CVS but since the git migration
    it has to be done through other means.
  - Remove 'experimental' warning for client-specific-tag-related directives.
    They seem to work reliably and there is no obvious reason
    why we would change the syntax in the near future.
  - Describe how to check if Privoxy has been built with
    FEATURE_HTTPS_INSPECTION.
  - Add a link to the trusted-cas-file documentation
    that explains how the user can create the file herself.
  - Don't explicitly mention the license for the code coming from
    'Anonymous Coders' and Junkbusters. It's obviously licensed under
    the GNU GPL like the rest of Privoxy or we wouldn't be allowed to
    distribute it.
  - Update the +hide-user-agent example with uagen output.
  - Slightly improve the wording of the ca-key-file documentation.
  - Explicitly mention Windows 10 as supported so search engines and
    users looking for it can find it.
  - Import a bunch of contributors from the ChangeLog.
  - Remove obsolete doc/gpl.html.
  - Upgrade a couple of links to https://.
  - Don't prefer the SourceForge patch tracker over the
    privoxy-devel mailing list. While at it, link to the
    SourceForge patch tracker.
  - Mention http-inspection in the 'my browser warns me about
    unauthenticated content' FAQ entry.
  - Simplify the 'Is there is a license or fee?' FAQ entry.
  - Add another +redirect{} example.
  - Explicitly mention that interested sponsors should include
    the link target in their first mail.
  - Clarify that only Privoxy team members can object to new sponsors
    and link to the list of current team members.
  - Note that sponsor URLs may not contain keyword spam.
  - Garbage collect doc/webserver/images which isn't referenced anymore.
  - Update the method to reach the proxy settings in Firefox.
  - Update proxy_setup.jpg description to refer to Firefox.
  - Regenerate proxy_setup.jpg with a more recent Firefox (78.0).
  - Regenerate files-in-use.jpg without obsolete standard.action
    with modern colors and a slightly better quality.
  - Update URL to the actionsfile tracker.
  - Update a support request URL.
  - Rephrase the 'Can Privoxy run as service' FAQ entry and
    remove an obsolete paragraph.
  - Let the 'Where can I get updated Actions Files?' entry link to
    the gitweb version of default.action.master.
  - Update a link to the default.action file.
  - Update URLs for trackers and mailing lists.
  - Replace CVS reference with git.
  - Mention regression-tests.action in the config file.
  - Explicitly mention in the config file that access to the
    CA key should be limited to Privoxy.
  - List more client-specific-tag examples for inspiration.
  - Add additional headers to the client-header-order example.
  - Note that actions aren't updated after rewrites.
  - Explicitly mention that upgrading from http to https with
    a client-header filter is not supported
  - Note that protocol and host have to be added when rewriting
    the destination host for https-inspected requests.
  - Explicitly mention that the CA key is used to sign certificates.
  - Put openssl command in 'command' tags.
  - The man page has been moved from section 1 to man section 8.

- Developer manual:
  - Flesh out the build instructions for Debian.
  - Remove the packaging instructions for RPM-based systems.
    They don't work and we don't release RPM packages anymore anyway.
  - Remove the packaging instructions for Solaris.
    They don't work and we don't release Solaris packages anymore anyway.
  - Update the suggested subject for the announce mails.
  - Update upload instructions.
    ftp://upload.sourceforge.net is no longer functional.
  - Remove a couple of package-dependent upload instructions
    that don't actually work.
  - Remove 'cd current' that no longer works.
  - Add regression-tests.action to the list of files that should be installed.
  - Stop claiming that there are text versions of the manuals.
    We stopped building them in 2008 (9ed36a3c5e6f12).
  - Note that the 'webserver' target creates the link needed for the user-manual.
  - Suggest to use the master branch as reference when creating
    the ChangeLog so the steps work when the current branch differs
    from master which is likely as the developer manual
    suggests to use a local branch for development.
  - Add the -s flag to the suggested 'git tag' command.  We prefer signed tags.
  - Mention that merges into 'master' should be avoided.
  - Add git commands that should result in a merge-free history.
  - Mention Privoxy-Regression-Test.
  - Add a section id to reduce link churn.
  - Recommend the dok-tidy target when building docs for the webserver.
  - Add another plug for the privoxy-devel mailing list.
  - Let the intro link the copyright section in the user manual instead
    of giving an incomplete summary of the license status.
  - Clarify that the webserver target uploads to the SourceForge webserver.
  - Mark the documentation for the Mac OS X installers as out of date and
    change the SCM name back to CVS.
  - Fix the location of the installer modules for Mac OS X.
    They are not actually available through git (yet).
  - Don't speak of Privoxy version 3 in the past tense.
  - Update the list of programs required for the release process.
  - Update description of the webserver target which uses ssh, not scp.
  - Remove obsolete reference to config.new.

- Tests:
  - Add another hide-referrer{conditional-block} test.
  - Add another hide-referrer{conditional-forge} test.
  - Fix a hide-referrer{conditional-forge} test
    that expected an acceptable header to be forged.
  - Fix a hide-referrer{conditional-block} test
    that expected an acceptable Referer to be removed.
  - Explain why the "Set Header = Host: whatever.example.org" test is
    expected to fail when using a CGI prefix that starts with "https://".
  - Explain why a connection-sharing test is known to fail
    when using "https://p.p/" as CGI prefix.
  - Add a link to Privoxy-Regression-Test to regression-tests.action
    in case it isn't packaged.
  - Add regression tests for pcre host patterns.
  - Fixed a regression test that is executed when
    FEATURE_GRACEFUL_TERMINATION is enabled.

- Privoxy infrastructure:
  - Import a Privoxy logo for the website.
  - Update Tor onion service to HiddenServiceVersion 3.
  - Display the "model" photos in a single row and remove placeholder images.
  - Regenerate homepage with updated sponsor list.
  - Use the '/sponsor' redirect for the link to the sponsor page.
  - Git commit messages are sent to the Privoxy-commits mailing list.

*** Version 3.0.29 stable ***

- Security/Reliability:
  - Fixed memory leaks when a response is buffered and the buffer
    limit is reached or Privoxy is running out of memory.
    Commits bbd53f1010b and 4490d451f9b. OVE-20201118-0001.
    CVE-2020-35502.
    Sponsored by: Robert Klemme
  - Fixed a memory leak in the show-status CGI handler when
    no action files are configured. Commit c62254a686.
    OVE-20201118-0002. CVE-2021-20209.
    Sponsored by: Robert Klemme
  - Fixed a memory leak in the show-status CGI handler when
    no filter files are configured. Commit 1b1370f7a8a.
    OVE-20201118-0003. CVE-2021-20210.
    Sponsored by: Robert Klemme
  - Fixes a memory leak when client tags are active.
    Commit 245e1cf32. OVE-20201118-0004. CVE-2021-20211.
    Sponsored by: Robert Klemme
  - Fixed a memory leak if multiple filters are executed
    and the last one is skipped due to a pcre error.
    Commit 5cfb7bc8fe. OVE-20201118-0005. CVE-2021-20212.
  - Prevent an unlikely dereference of a NULL-pointer that
    could result in a crash if accept-intercepted-requests
    was enabled, Privoxy failed to get the request destination
    from the Host header and a memory allocation failed.
    Commit 7530132349. CID 267165. OVE-20201118-0006. CVE-2021-20213.
  - Fixed memory leaks in the client-tags CGI handler when
    client tags are configured and memory allocations fail.
    Commit cf5640eb2a. CID 267168. OVE-20201118-0007. CVE-2021-20214.
  - Fixed memory leaks in the show-status CGI handler when memory
    allocations fail. Commit 064eac5fd0 and commit fdee85c0bf3.
    CID 305233. OVE-20201118-0008. CVE-2021-20215.

- General improvements:
  - Added experimental https inspection support which allows to filter
    https traffic. To enable it, install MbedTLS and configure with
    --with-mbedtls, or install OpenSSL or LibreSSL and configure
    with --with-openssl.
    Afterwards configure the directives in section 7 of the
    config file and enable the +https-inspection action.
    Initial MbedTLS-based code contributed by Vaclav Svec,
    initial OpenSSL support contributed by Maxim Antonov.
    With help from Nedzad Hrnjica and Ho+ Ho+ Ho+.
    Integration and improvements sponsored by Robert Klemme.
  - pcrs: Request JIT compilation if it's supported and
    the filter isn't dynamic. This can speed up filtering.
  - Added support for Brotli decompression.
    Sponsored by: Robert Klemme
  - Added FEATURE_EXTENDED_STATISTICS to gather statistics for
    block reasons and filter executions. To enable it, configure
    with --enable-extended-statistics and visit
    http://config.privoxy.org/show-status.
    Sponsored by: Robert Klemme
  - Use the IP_FREEBIND socket option, if defined. This allows
    Privoxy to bind to not-yet assigned IP addresses which is
    useful in failover environments.
    Patch by Sam Varshavchik.
  - Allow to use extended host patterns and vanilla host patterns
    at the same time by prefixing extended host patterns with
    "PCRE-HOST-PATTERN:". To enable this, configure with
    --enable-pcre-host-patterns.
    Sponsored by: Robert Klemme
  - Added "Cross-origin resource sharing" (CORS) support.
    This allows to access Privoxy's CGI interface via JavaScript from
    another domain (white-listed with the new cors-allowed-origin directive).
    Based on a patch by Nedzad Hrnjica.
    Sponsored by: Robert Klemme.
  - Add SOCKS5 username/password support.
    Based on a patch by Sam, improved by Ivan Romanov.
    Closes Patch#141 and solves TODO#105.
  - Bump the maximum number of action and filter files
    to 100 each.
    Sponsored by: Robert Klemme
  - Fixed handling of filters with "split-large-forms 1"
    when using the CGI editor.
    Reported by withoutname in #921.
  - Better detect a mismatch of connection details when
    figuring out whether or not a connection can be reused.
  - Don't send a "Connection failure" message instead of the
    "DNS failure" message.
    Sponsored by: Robert Klemme
  - Let LOG_LEVEL_REQUEST log all requests. Previously unencrypted
    requests were only logged with LOG_LEVEL_REQUEST when they weren't
    crunched (in which case they were logged with LOG_LEVEL_CRUNCH).
    This was documented behaviour, but logging all requests seems more useful.
  - Fixed locking around localtime() and gmtime().
  - Removed OS/2 support. We haven't provided OS/2 packages in years,
    it complicated the code and it depended on a fallback snprintf()
    implementation which is GPLv2 only.
  - Remove the fallback snprintf() implementation
    Now that OS/2 support is gone we no longer need it.
  - Fixed a bunch of format specifiers log messages.
  - Added a missing apostrophe in the 'More Privoxy' menu.
  - Explicitly prevent use of FEATURE_CONNECTION_SHARING
    without FEATURE_CONNECTION_KEEP_ALIVE. It makes no sense
    and does not compile anyway.
    Sponsored by: Robert Klemme
  - Fix build without FEATURE_CONNECTION_KEEP_ALIVE.
    Sponsored by: Robert Klemme
  - Downgrade the 'Graceful termination requested' message
    to LOG_LEVEL_INFO as it isn't an error.
    Sponsored by: Robert Klemme
  - decompress_iob(): Downgrade the no-content message to LOG_LEVEL_RE_FILTER
    While at it, fix a typo in a comment.
    Sponsored by: Robert Klemme
  - Fixed a couple of cppcheck warnings.
  - Rename LOG_LEVEL_GPC to LOG_LEVEL_REQUEST.
    Only the shadow knows what "GPC" is supposed to stand for.
  - Remove SourceForge references in copyright headers.
  - Upgrade a bunch of links to the homepage to https://.
  - Add 'no-brotli-accepted' filter which prevents the
    use of Brotli compression.
  - Changed license for pcrs to GPLv2+ after getting the
    permission from Andreas. This allows to redistribute
    Privoxy under the GPLv3 which is required when linking
    to future mbedTLS versions which are expected to be
    licensed under the Apache 2.0 license only.
  - Updated a bunch of tests that have to expect status code 403
    now after r1.168/070e904afa5.
  - Lowercase the host name in the request line.
  - Only set SOURCE_DATE_EPOCH if it's not already set so
    distributions can overwrite it through the environment.

- Documentation changes:
  - Explain that Privoxy has to be distributed under the
    GPLv3 (or later) when linked with an MbedTLS version
    that is licensed under the Apache 2.0 license.
  - Import the GNU GPLv3 and include it the user manual.
  - Clarify FEATURE_FORCE_LOAD's description. It allows to bypass
    blocking not filtering and only does it if blocks aren't enforced.
    Reported by: Robert Klemme
  - FAQ: Remove Zwiebelfreunde e.V. from the list of fiduciary sponsors
    As of 2021 they no longer handle donations for foreign organisations
    due to lack of resources.
  - FAQ: Remove an obsolete comment with a link to the long-gone PDF manual.
  - FAQ: Add a link to the TODO list.
  - FAQ: Change the sponsor amounts to USD slightly rounding the
    converted amounts up to get simple numbers.
    Receiving USD is apparently easier for SPI and SPI is
    preferred by sponsors as they can send invoices.
  - Advertise the client-tags CGI page in the user manual.
  - Stop advertising the show-version CGI page which no longer exists.
  - Add yet another reason why +prevent-compression may cause problems.
  - Don't claim that contributors need ssh. It's only needed for committers.
  - Replace obsolete CVS instructions with Git instructions.
  - Remove an obsolete comment

- Config file changes:
  - Change the suggested default-server-timeout to 5 to match the
    suggested keep-alive-timeout. Otherwise using the defaults would
    result in Privoxy reducing the default-server-timeout and logging
    an error message.
    Sponsored by: Robert Klemme
  - Update the 'debug 1' description.
  - Add a missing 'client-specific-tag' directive.
  - Comment out trusted-cgi-referer pointing to example.org.

- Action file improvements:
  - Block requests to /(.*/)?piwik\.php
  - Block requests to .connectaserver.de/
  - Block requests to pixel.inforsea.com/
  - Block requests to t.vi-serve.com/
  - Block requests to .ioam.de/
  - Block requests to t.9gag.com/img.gif
  - Block requests to .pixel.parsely.com/ as image
  - Block requests to pixel.wp.com/
  - Disable fast-redirects for .librarything.com/
  - Disable fast-redirects for issue.freebsdfoundation.org/
  - Disable fast-redirects for .twitter.com/.*origin=http
  - Unblock belco24.de/
  - Add fast-redirects exception for .wikipedia.org/
  - Add fast-redirects exception for oss-fuzz.com/
  - Disable fast-redirects for .consensu.org/delivery/pixel\.php
    and block the requests as image instead
  - Unblock .adbinstaller.com/
    Reported by lvm in #942.
  - Unblock .adbshell.com
    Reported by lvm in #942.
  - Unblock .tagesschau.de/
  - Disable fast-redirects for collector.githubapp.com/
    and block requests to it as image instead
  - Unblock 'ada*.'
  - Add fast-redirects{} exception for sourcepoint.vice.com/
  - Unblock adaway.org/
    Reported by DRS David Soft in AF#945.
  - Change two block reasons that previously were the same.
    Sponsored by: Robert Klemme
  - Added a +delay-response{} test.
  - Updated the location of the development version
    of default.action.master.

- Privoxy-Log-Parser:
  - Added a --keep-date option to keep the date in highlighted messages.
  - Highlight new log messages.
  - Make gather_loglevel_clf_stats() more tolerant. While at it,
    count all CLF messages as requests, even if the request is invalid.
  - Only show HTTP version distribution if at least one version has been detected.
  - Only show crunch statistics if crunches were detected.
  - Warn if the request counts differ.
  - Generate statistics if the log only contains LOG_LEVEL_CLF messages
    so it can be used with vanilla webserver logs.
    Previously Privoxy-specific "Request:" messages were required.
  - Align the client-HTTP-version distribution like other distributions
  - Bump version to 0.9.1
  - Include status code distribution in the stats.
  - Let the statistics include the size of the content Privoxy
    transferred excluding HTTP headers.
  - Get with the program and expect all requests to be logged with LOG_LEVEL_REQUEST.
    It's no longer necessary to count both LOG_LEVEL_REQUEST and
    LOG_LEVEL_CRUNCH messages to get the total number of requests.
  - Leverage the LOG_LEVEL_CLF message to gather statistics that where
    previously taken from LOG_LEVEL_HEADER lines. This results in less
    confusing results if https inspection is enabled in which case there
    are two LOG_LEVEL_HEADER lines with request lines.
    Sponsored by: Robert Klemme
  - Properly highlight the filter results message. Previously a brace got lost.
  - Prefer the number of CLF lines to get the total number of requests
    as it works with older Privoxy versions as well.

- Privoxy-Regression-Test:
  - Turn curl's globbing mode off so we can allow more characters in URLs.
  - Allow '[' and ']' in URLs.
  - Include the action file when complaining about missing Sticky Actions.
  - Fix a sentence in the documentation.
  - Bump version to 0.7.1

- url-pattern-translator:
  - Detect a couple of pattern prefixes case-insensitively.
    Sponsored by: Robert Klemme
  - Skip CLIENT-TAG patterns.
    Sponsored by: Robert Klemme
  - Skip patterns that have already been converted.
    It should now be safe to "convert" a file multiple times.
    Sponsored by: Robert Klemme
  - Add the new 'PCRE-HOST-PATTERN:' prefix.
    Sponsored by: Robert Klemme

*** Version 3.0.28 stable ***

- Bug fixes for regressions in 3.0.27:
  - Fixed misplaced parentheses.
    Reported by David Binderman.
  - Changed two regression tests to depend on config directive
    enable-remote-toggle instead of FEATURE_TOGGLE.

*** Version 3.0.27 stable ***

- General improvements:
  - Add a receive-buffer-size directive which can be used to
    set the size of the previously statically allocated buffer
    in handle_established_connection().
    Increasing the buffer size increases Privoxy's memory usage but
    can lower the number of context switches and thereby reduce the
    CPU usage and potentially increase the throughput.
    This is mostly relevant for fast network connections and
    large downloads that don't require filtering.
    Sponsored by: Robert Klemme
  - Add a listen-backlog directive which specifies the backlog
    value passed to listen().
    Sponsored by: Robert Klemme
  - Add an enable-accept-filter directive which allows to
    toggle accept filter support at run time when compiled
    with FEATURE_ACCEPT_FILTER support.
    It makes testing more convenient and now that it's
    optional we can emit an error message if enabling
    the accept filter fails.
    Sponsored by: Robert Klemme
  - Add a delay-response{} action.
    This is useful to tar pit JavaScript requests that
    are endlessly retried in case of blocks. It can also
    be used to simulate a slow Internet connection.
    Sponsored by: Robert Klemme
  - Add a 'trusted-cgi-referrer' directive.
    It allows to configure another page or site that can be used
    to reach sensitive CGI resources.
    Sponsored by: Robert Klemme
  - Add a --fuzz mode which exposes Privoxy internals to input
    from files or stdout.
    Mainly tested with American Fuzzy Lop. For details see:
    https://www.fabiankeil.de/talks/fuzzing-on-freebsd/
    This work was partially funded with donations and done
    as part of the Privoxy month in 2015.
  - Consistently use the U(ngreedy) flag in the 'img-reorder' filter.
  - listen_loop(): Reuse a single thread attribute object
    The object doesn't change and creating a new one for
    every thread is a waste of (CPU) time.
    Sponsored by: Robert Klemme
  - Free csp resources in the thread that belongs to the csp instead
    of the main thread which has enough on its plate already.
    Sponsored by: Robert Klemme
  - Improve 'socket timeout reached' message.
    Log the timeout that was triggered and downgrade the
    log level to LOG_LEVEL_CONNECT to reduce the log noise
    with common debug settings.
    The timeout isn't necessary the result of an error and
    usually merely indicates that Privoxy's socket timeout
    is lower than the relevant timeouts used by client and
    server.
    Sponsored by: Robert Klemme
  - Explicitly taint the server socket in case of CONNECT requests.
    This doesn't fix any known problems, but makes
    some log messages less confusing.
  - Let write_pid_file() terminate if the pid file can't be opened.
    Logging the issue at info level is unlikely to help.
  - log_error(): Reduce the mutex-protected area by not using a
    heap-allocated buffer that is shared between all threads.
    This increases performance and reduces the latency with
    verbose debug settings and multiple concurrent connections.
    Sponsored by: Robert Klemme
  - Let zalloc() use calloc() if it's available.
    In some situations using calloc() can be faster than
    malloc() + memset() and it should never be slower.
    In the real world the impact of this change is not
    expected to be noticeable.
    Sponsored by: Robert Klemme
  - Never use select() when poll() is available.
    On most platforms select() is limited by FD_SETSIZE while
    poll() is not. This was a scaling issue for multi-user setups.
    Using poll() has no downside other than the usual risk
    that code modifications may introduce new bugs that have
    yet to be found and fixed.
    At least in theory this commit could also reduce the latency
    when there are lots of connections and select() would use
    "bit fields in arrays of integers" to store file descriptors.
    Another side effect is that Privoxy no longer has to stop
    monitoring the client sockets when pipelined requests are
    waiting but can't be read yet.
    This code keeps the select()-based code behind ifdefs for
    now but hopefully it can be removed soonish to make the
    code more readable.
    Sponsored by: Robert Klemme
  - Add a 'reproducible-tarball-dist' target.
    It's currently separate from the "tarball-dist" target
    because it requires a tar implementation with mtree spec
    support.
    It's far from being perfect and does not enforce a
    reproducible mode, but it's better than nothing.
  - Use arc4random() if it's available.
    While Privoxy doesn't need high quality pseudo-random numbers
    there's no reason not to use them when we can and this silences
    a warning emitted by code checkers that can't tell whether or not
    the quality matters.
  - Show the FEATURE_EXTERNAL_FILTERS status on the status page.
    Better late than never. Previously a couple of tests weren't
    executed as Privoxy-Regression-Test couldn't detect that the
    FEATURE_EXTERNAL_FILTERS dependency was satisfied.
  - Ditch FEATURE_IMAGE_DETECT_MSIE.
    It's an obsolete workaround we inherited from Junkbuster
    and was already disabled by default.
    Users that feel the urge to work around issues with
    image requests coming from an Internet Explorer version
    from more than 15 years ago can still do this using tags.
  - Consistently use strdup_or_die() instead of strdup() in
    cases where allocation failures aren't expected.
    Using strdup_or_die() allows to remove a couple of explicit
    error checks which slightly reduces the size of the binary.
  - Insert a refresh tag into the /client-tags CGI page when
    serving it while a client-specific tag is temporarily enabled.
    This makes it less likely that the user ends up
    looking at tag state that is out of date.
  - Use absolute URLs in the client-tag forms.
    It's more consistent with the rest of the CGI page
    URLs and makes it more convenient to copy the forms
    to external pages.
  - cgi_error_disabled(): Use status code 403 and an appropriate response line
  - Use a dedicated CGI handler to deal with tag-toggle requests
    As a result the /client-tags page is now safe to reach without
    trusted Referer header which makes bookmarking or linking to
    it more convenient.
    Finally, refreshing the /client-tags page to show the
    current state can no longer unintentionally repeat the
    previous toggle request.
  - Don't add a "Connection" header for CONNECT requests.
    Explicitly sending "Connection: close" is not necessary and
    apparently it causes problems with some forwarding proxies
    that will close the connection prematurely.
    Reported by Marc Thomas.
  - Fix compiler warnings.

- Bug fixes:
  - rfc2553_connect_to(): Properly detect and log when poll()
    reached the time out. Previously this was logged as:
    Could not connect to [...]: No error: 0.
    which isn't very helpful.
    Sponsored by: Robert Klemme
  - add_tag_for_client(): Set time_to_live properly.
    Previously the time_to_live was always set for the first tag.
    Attempts to temporarily enable a tag would result in enabling
    it permanently unless no tag was enabled already.
  - Revert r1.165 which didn't perform as advertised.
    While the idea was to use "https:// when creating links
    for the user manual on the website", the actual effect
    was to use "https://" when Privoxy was supposed to serve
    the user manual itself.
    Reported by Yossi Zahn on Privoxy-devel@.
  - socks5_connect(): Fail in case of unsupported address types.
    Previously they would not be detected right away and
    Privoxy would fail later on with an error message that
    didn't make it obvious that the problem was socks-related.
    So far, no such problems have actually been reported.
  - socks5_connect(): Properly deal with socks replies that
    contain IPv6 addresses.
    Previously parts of the reply were left unread and
    later on treated as invalid HTTP response data.
    Fixes #904 reported by Danny Goossen who also provided
    the initial version of this patch.

- Action file improvements:
  - Unblock 'msdn.microsoft.com/'.
    It (presumably) isn't used to serve the kind of ads Privoxy should
    block by default but happens to serve lots of pages with URLs that
    are likely to result in false positives.
    Reported by bugreporter1694 in AF#939.
  - Disable gif deanimation for requests tagged with CSS-REQUEST.
    The action will ignore content that isn't considered text
    anyway and explicitly disabling it makes this more obvious
    if "action" debugging (debug 65536) is enabled while
    "gif deanimation" debugging (debug 256) isn't.
  - Explicitly disable HTML filters for requests with CSS-REQUEST tag.
    The filters are unlikely to break CSS files but executing
    them without (intentionally) getting any hits is a waste of
    cpu time and makes the log more noisy when running with
    "debug 64".
  - Unblock 'adventofcode.com/'.
    Reported by Clint Adams in Debian bug #848211.
    Fixes Roland's AF#937.
  - Unblock 'adlibris.com'.
    Reported by Wyrex in #935
  - Unblock .golang.org/
  - Add fast-redirects exception for '.youtube.com/.*origin=http'

- Privoxy-Log-Parser:
  - Don't gather host and resource statistics if they aren't requested.
    While the performance impact seems negligible this significantly
    reduces the memory usage if there are lots of requests.
  - Bump version as the behaviour (slightly) changed.
  - Count connection failures as well in statistics mode.
    Sponsored by: Robert Klemme
  - Count connection timeouts as well in statistics mode.
    Sponsored by: Robert Klemme
  - Fix an 'uninitialized value' warning when generating
    statistics for a log file without response headers.
    While privoxy-log-parser was supposed to detect this already,
    the check was flawed and the message the user didn't see was
    somewhat confusing anyway.
    Now the message is less confusing, more helpful and actually printed.
    Reported by: Robert Klemme

- Documentation improvements:
  - Refer to the git sources instead of CVS.
  - Use GNU/Linux when referring to the OS instead of the kernel.
  - Add FAQ entry for what to do if editing the config file is access denied.
  - Add brief HTTP/2 FAQ.
  - Add a small fuzzing section to the developer documentation.
  - Add a client-header-tagger{client-ip-address} example.
  - Stop suggesting that Privoxy is an anonymizing proxy.
    The term could lead to Privoxy users overestimating
    what it can do on its own (without Tor).
  - Make it more obvious that SPI accepts Paypal, too.
    Currently most donations are made through the Paypal account
    managed by Zwiebelfreunde e.V. and a more even distribution
    would be useful.
  - Suggest to log applying actions as well when reproducing problems.
  - Explicitly mention that Privoxy binaries are built by individuals
    on their own systems. Buyer beware!
  - Mention the release feed on the homepage.
  - Remove a mysterious comment with a GNU FDL link as it isn't
    useful and could confuse license scanners.
    In May 2002 it was briefly claimed that "this document" was covered
    by the GNU FDL. The commit message (r1.5) doesn't explain the motivation
    or whether all copyright holders were actually asked and agreed to the
    declared license change.
    It's thus hard to tell whether or not the license change was legit,
    but luckily two days later the "doc license" was "put" "back to GPL"
    anyway (r1.6).
    At the same time the offending comment with a link to the FDL
    (not the GPL) was added for no obvious reason.
    Now it's gone again.

- Regression tests:
  - Bump for-privoxy-version to 3.0.27 as we now rely on untrusted
    CGI request being rejected with status code 403 (instead of 200).
  - Update test for /send-stylesheet and add another one

- Templates:
  - Consistently use https:// when linking to the Privoxy website.
  - Remove SourceForge references in Copyright header.
  - Remove a couple of SourceForge references in a comment.
    While at it, fix the grammar.
  - Move the site-specific documentation block before the generic one.
    While most Privoxy installations don't have a site-specific
    documentation block, in cases were it exists it's likely to
    be more relevant than the generic one.
    Showing it first makes it less likely that users stop reading
    before they reach it, especially on pages that don't fit on
    the screen.

- Build system improvements:
  - Prefer openjade to jade. On some systems Jade produces
    HTML with unescaped ampersands in URLs.
  - Prefer OpenSP to SP to be consistent.
  - Have Docbook generated HTML files be straight ASCII.
    Dealing with a mixture of ISO-8859 and UTF-8 files is problematic.
  - Echo the filename to stderr for 'make dok-tidy'.
    Make it a bit easier to find errors in docbook generated HTML.
  - Warn when still using select().
  - Warn when compiling without calloc().
  - Make it more obvious that the --with-fdsetsize configure switch
    is pointless if poll() is available.
  - Remove support for AmigaOS.
  - Update windows build system to use supported software.
    The cygwin gcc -mno-cygwin option is no longer supported, so
    convert the windows build system to use the cygwin cross-compiler
    to build "native" code.
  - Add --enable-static-linking option for configure
    does the same thing as LDFLAGS=-static; ./configure
    but nicer than mixing evars and configure options.

*** Version 3.0.26 stable ***

- Bug fixes:
  - Fixed crashes with "listen-addr :8118" (SF Bug #902).
    The regression was introduced in 3.0.25 beta and reported
    by Marvin Renich in Debian bug #834941.

- General improvements:
  - Log when privoxy is toggled on or off via cgi interface.
  - Highlight the "Info: Now toggled " on/off log message
    in the Windows log viewer.
  - Highlight the loading actions/filter file log message
    in the Windows log viewer.
  - Mention client-specific tags on the toggle page as a
    potentionally more appropriate alternative.

- Documentation improvements:
  - Update download section on the homepage.
    The downloads are available from the website now.
  - Add sponsor FAQ.
  - Remove obsolete reference to mailing lists hosted at SourceForge.
  - Update the "Before the Release" section of the developer manual.

- Infrastructure improvements:
  - Add perl script to generate an RSS feed for the packages
    Submitted by "Unknown".

- Build system improvements:
  - strptime.h: fix a compiler warning about ambiguous else.
  - configure.in: Check for Docbook goo on the BSDs as well.
  - GNUMakefile.in: Let the dok-user target remove temporary files.

*** Version 3.0.25 beta ***

- Bug fixes:
  - Always use the current toggle state for new requests.
    Previously new requests on reused connections inherited
    the toggle state from the previous request even though
    the toggle state could have changed.
    Reported by Robert Klemme.
  - Fixed two buffer-overflows in the (deprecated) static
    pcre code. These bugs are not considered security issues
    as the input is trusted.
    Found with afl-fuzz and ASAN.

- General improvements:
  - Added support for client-specific tags which allow Privoxy
    admins to pre-define tags that are set for all requests from
    clients that previously opted in through the CGI interface.
    They are useful in multi-user setups where admins may
    want to allow users to disable certain actions and filters
    for themselves without affecting others.
    In single-user setups they are useful to allow more fine-grained
    toggling. For example to disable request blocking while still
    crunching cookies, or to disable experimental filters only.
    This is an experimental feature, the syntax and behaviour may
    change in future versions.
    Sponsored by Robert Klemme.
  - Dynamic filters and taggers now support a $listen-address variable
    which contains the address the request came in on.
    For external filters the variable is called $PRIVOXY_LISTEN_ADDRESS.
    Original patch contributed by pursievro.
  - Add client-header-tagger 'listen-address'.
  - Include the listen-address in the log message when logging new requests.
    Patch contributed by pursievro.
  - Turn invalid max-client-connections values into fatal errors.
  - The show-status page now shows whether or not dates before 1970
    and after 2038 are expected to be handled properly.
    This is mainly useful for Privoxy-Regression-Test but could
    also come handy when dealing with time-related support requests.
  - On Mac OS X the thread id in log messages are more likely to
    be unique now.
  - When complaining about missing filters, the filter type is logged
    as well.
  - A couple of harmless coverity warnings were silenced
    (CID #161202, CID #161203, CID #161211).

- Action file improvements:
  - Filtering is disabled for Range requests to let download resumption
    and Windows updates work with the default configuration.
  - Unblock ".ardmediathek.de/".
    Reported by ThTomate in #932.

- Documentation improvements:
  - Add FAQ entry for crashes caused by memory limits.
  - Remove obsolete FAQ entry about a bug in PHP 4.2.3.
  - Mention the new mailing lists were appropriate.
    As the archives have not been migrated, continue to
    mention the archives at SF in the contacting section
    for now.
  - Note that the templates should be adjusted if Privoxy is
    running as intercepting proxy without getting all requests.
  - A bunch of links were converted to https://.
  - Rephrase onion service paragraph to make it more obvious
    that Tor is involved and that the whole website (and not
    just the homepage) is available as onion service.
  - Streamline the "More information" section on the homepage further
    by additionally ditching the link to the 'See also' section
    of the user manual. The section contains mostly links that are
    directly reachable from the homepage already and the rest is
    not significant enough to get a link from the homepage.
  - Change the add-header{} example to set the DNT header
    and use a complete section to make copy and pasting
    more convenient.
    Add a comment to make it obvious that adding the
    header is not recommended for obvious reasons.
    Using the DNT header as example was suggested by
    Leo Wzukw.
  - Streamline the support-and-service template
    Instead of linking to the various support trackers
    (whose URLs hopefully change soon), link to the
    contact section of the user manual to increase the
    chances that users actually read it.
  - Add a FAQ entry for tainted sockets.
  - More sections in the documentation have stable URLs now.
  - FAQ: Explain why 'ping config.privoxy.org' is not expected
    to reach a local Privoxy installation.
  - Note that donations done through Zwiebelfreunde e.V. currently
    can't be checked automatically.
  - Updated section regarding starting Privoxy under OS X.
  - Use dedicated start instructions for FreeBSD and ElectroBSD.
  - Removed release instructions for AIX. They haven't been working
    for years and unsurprisingly nobody seems to care.
  - Removed obsolete reference to the solaris-dist target.
  - Updated the release instructions for FreeBSD.
  - Removed unfinished release instructions for Amiga OS and HP-UX 11.
  - Added a pointer to the Cygwin Time Machine for getting the last release of
    Cygwin version 1.5 to use for building Privoxy on Windows.
  - Various typos have been fixed.

- Infrastructure improvements:
  - The website is no longer hosted at SourceForge and
    can be reached through https now.
  - The mailing lists at SourceForge have been deprecated,
    you can subscribe to the new ones at: https://lists.privoxy.org/
  - Migrating the remaining services from SourceForge is
    work in progress (TODO list item #53).

- Build system improvements:
  - Add configure argument to optimistically redefine FD_SETSIZE
    with the intent to change the maximum number of client
    connections Privoxy can handle. Only works with some libcs.
    Sponsored by Robert Klemme.
  - Let the tarball-dist target skip files in ".git".
  - Let the tarball-dist target work in cwds other than current.
  - Make the 'clean' target faster when run from a git repository.
  - Include tools in the generic distribution.
  - Let the gen-dist target work in cwds other than current.
  - Sort find output that is used for distribution tarballs
    to get reproducible results.
  - Don't add '-src' to the name of the tar ball generated by the
    gen-dist target. The package isn't a source distribution but a
    binary package.
    While at it, use a variable for the name to reduce the chances
    that the various references get out of sync and fix the gen-upload
    target which was looking in the wrong directory.
  - Add regression-tests.action to the files that are distributed.
  - The gen-dist target which was broken since 2002 (r1.92) has been fixed.
  - Remove genclspec.sh which has been obsolete since 2009.
  - Remove obsolete reference to Redhat spec file.
  - Remove the obsolete announce target which has been commented out years ago.
  - Let rsync skip files if the checksums match.

- Privoxy-Regression-Test:
  - Add a "Default level offset" directive which can be used to
    change the default level by a given value.
    This directive affects all tests located after it until the end
    of the file or a another "Default level offset" directive is reached.
    The purpose of this directive is to make it more convenient to skip
    similar tests in a given file without having to remove or disable
    the tests completely.
  - Let test level 17 depend on FEATURE_64_BIT_TIME_T
    instead of FEATURE_PTHREAD which has no direct connection
    to the time_t size.
  - Fix indentation in perldoc examples.
  - Don't overlook directives in the first line of the action file.
  - Bump version to 0.7.
  - Fix detection of the Privoxy version now that https://
    is used for the website.

*** Version 3.0.24 stable ***

- Security fixes (denial of service):
  - Prevent invalid reads in case of corrupt chunk-encoded content.
    CVE-2016-1982. Bug discovered with afl-fuzz and AddressSanitizer.
  - Remove empty Host headers in client requests.
    Previously they would result in invalid reads. CVE-2016-1983.
    Bug discovered with afl-fuzz and AddressSanitizer.

- Bug fixes:
  - When using socks5t, send the request body optimistically as well.
    Previously the request body wasn't guaranteed to be sent at all
    and the error message incorrectly blamed the server.
    Fixes #1686 reported by Peter Müller and G4JC.
  - Fixed buffer scaling in execute_external_filter() that could lead
    to crashes. Submitted by Yang Xia in #892.
  - Fixed crashes when executing external filters on platforms like
    Mac OS X. Reported by Jonathan McKenzie on ijbswa-users@.
  - Properly parse ACL directives with ports when compiled with HAVE_RFC2553.
    Previously the port wasn't removed from the host and in case of
    'permit-access 127.0.0.1 example.org:80' Privoxy would try (and fail)
    to resolve "example.org:80" instead of example.org.
    Reported by Pak Chan on ijbswa-users@.
  - Check requests more carefully before serving them forcefully
    when blocks aren't enforced. Privoxy always adds the force token
    at the beginning of the path, but would previously accept it anywhere
    in the request line. This could result in requests being served that
    should be blocked. For example in case of pages that were loaded with
    force and contained JavaScript to create additionally requests that
    embed the origin URL (thus inheriting the force prefix).
    The bug is not considered a security issue and the fix does not make
    it harder for remote sites to intentionally circumvent blocks if
    Privoxy isn't configured to enforce them.
    Fixes #1695 reported by Korda.
  - Normalize the request line in intercepted requests to make rewriting
    the destination more convenient. Previously rewrites for intercepted
    requests were expected to fail unless $hostport was being used, but
    they failed "the wrong way" and would result in an out-of-memory
    message (vanilla host patterns) or a crash (extended host patterns).
    Reported by "Guybrush Threepwood" in #1694.
  - Enable socket lingering for the correct socket.
    Previously it was repeatedly enabled for the listen socket
    instead of for the accepted socket. The bug was found by
    code inspection and did not cause any (reported) issues.
  - Detect and reject parameters for parameter-less actions.
    Previously they were silently ignored.
  - Fixed invalid reads in internal and outdated pcre code.
    Found with afl-fuzz and AddressSanitizer.
  - Prevent invalid read when loading invalid action files.
    Found with afl-fuzz and AddressSanitizer.
  - Windows build: Use the correct function to close the event handle.
    It's unclear if this bug had a negative impact on Privoxy's behaviour.
    Reported by Jarry Xu in #891.
  - In case of invalid forward-socks5(t) directives, use the
    correct directive name in the error messages. Previously they
    referred to forward-socks4t failures.
    Reported by Joel Verhagen in #889.

- General improvements:
  - Set NO_DELAY flag for the accepting socket. This significantly reduces
    the latency if the operating system is not configured to set the flag
    by default. Reported by Johan Sintorn in #894.
  - Allow to build with mingw x86_64. Submitted by Rustam Abdullaev in #135.
  - Introduce the new forwarding type 'forward-webserver'.
    Currently it is only supported by the forward-override{} action and
    there's no config directive with the same name. The forwarding type
    is similar to 'forward', but the request line only contains the path
    instead of the complete URL.
  - The CGI editor no longer treats 'standard.action' special.
    Nowadays the official "standards" are part of default.action
    and there's no obvious reason to disallow editing them through
    the cgi editor anyway (if the user decided that the lack of
    authentication isn't an issue in her environment).
  - Improved error messages when rejecting intercepted requests
    with unknown destination.
  - A couple of log messages now include the number of active threads.
  - Removed non-standard Proxy-Agent headers in HTTP snipplets
    to make testing more convenient.
  - Include the error code for pcre errors Privoxy does not recognize.
  - Config directives with numerical arguments are checked more carefully.
  - Privoxy's malloc() wrapper has been changed to prevent zero-size
    allocations which should only occur as the result of bugs.
  - Various cosmetic changes.

- Action file improvements:
  - Unblock ".deutschlandradiokultur.de/".
    Reported by u302320 in #924.
  - Add two fast-redirect exceptions for "yandex.ru".
  - Disable filter{banners-by-size} for ".plasmaservice.de/".
  - Unblock "klikki.fi/adv/".
  - Block requests for "resources.infolinks.com/".
    Reported by "Black Rider" on ijbswa-users@.
  - Block a bunch of criteo domains.
    Reported by Black Rider.
  - Block "abs.proxistore.com/abe/".
    Reported by Black Rider.
  - Disable filter{banners-by-size} for ".black-mosquito.org/".
  - Disable fast-redirects for "disqus.com/".

- Documentation improvements:
  - FAQ: Explicitly point fingers at ASUS as an example of a
    company that has been reported to force malware based on
    Privoxy upon its customers.
  - Correctly document the action type for a bunch of "multi-value"
    actions that were incorrectly documented to be "parameterized".
    Reported by Gregory Seidman on ijbswa-users@.
  - Fixed the documented type of the forward-override{} action
    which is obviously 'parameterized'.

- Website improvements:
  - Users who don't trust binaries served by SourceForge
    can get them from a mirror. Migrating away from SourceForge
    is planned for 2016 (TODO list item #53).
  - The website is now available as onion service
    (http://jvauzb4sb3bwlsnc.onion/).

*** Version 3.0.23 stable ***

- Bug fixes:
  - Fixed a DoS issue in case of client requests with incorrect
    chunk-encoded body. When compiled with assertions enabled
    (the default) they could previously cause Privoxy to abort().
    Reported by Matthew Daley. CVE-2015-1380.
  - Fixed multiple segmentation faults and memory leaks in the
    pcrs code. This fix also increases the chances that an invalid
    pcrs command is rejected as such. Previously some invalid commands
    would be loaded without error. Note that Privoxy's pcrs sources
    (action and filter files) are considered trustworthy input and
    should not be writable by untrusted third-parties. CVE-2015-1381.
  - Fixed an 'invalid read' bug which could at least theoretically
    cause Privoxy to crash. So far, no crashes have been observed.
    CVE-2015-1382.
  - Compiles with --disable-force again. Reported by Kai Raven.
  - Client requests with body that can't be delivered no longer
    cause pipelined requests behind them to be rejected as invalid.
    Reported by Basil Hussain.

- General improvements:
  - If a pcrs command is rejected as invalid, Privoxy now logs
    the cause of the problem as text. Previously the pcrs error
    code was logged.
  - The tests are less likely to cause false positives.

- Action file improvements:
  - '.sify.com/' is no longer blocked. Apparently it is not actually
    a pure tracking site (anymore?). Reported by Andrew on ijbswa-users@.
  - Unblock banners on .amnesty.de/ which aren't ads.

- Documentation improvements:
  - The 'Would you like to donate?' section now also contains
    a "Paypal" address.
  - The list of supported operating systems has been updated.
  - The existence of the SF support and feature trackers has been
    deemphasized because they have been broken for months.
    Most of the time the mailing lists still work.
  - The claim that default.action updates are sometimes released
    on their own has been removed. It hasn't happened in years.
  - Explicitly mention that Tor's port may deviate from the default
    when using a bundle. Requested by Andrew on ijbswa-users@.

*** Version 3.0.22 stable ***

- Bug fixes:
  - Fixed a memory leak when rejecting client connections due to
    the socket limit being reached (CID 66382). This affected
    Privoxy 3.0.21 when compiled with IPv6 support (on most
    platforms this is the default). CVE-2015-1030.
  - Fixed an immediate-use-after-free bug (CID 66394) and two
    additional unconfirmed use-after-free complaints made by
    Coverity scan (CID 66391, CID 66376). CVE-2015-1031.
  - Actually show the FORCE_PREFIX value on the show-status page.
  - Properly deal with Keep-Alive headers with timeout= parameters
    If the timeout still can't be parsed, use the configured
    timeout instead of preventing the client from keeping the
    connection alive. Fixes #3615312/#870 reported by Bernard Guillot.
  - Not using any filter files no longer results in warning messages
    unless an action file is referencing header taggers or filters.
    Reported by Stefan Kurtz in #3614835.
  - Fixed a bug that prevented Privoxy from reusing some reusable
    connections. Two bit masks with different purpose unintentionally
    shared the same bit.
  - A couple of additional bugs were discovered by Coverity Scan.
    The fixes that are not expected to affect users are not explicitly
    mentioned here, for details please have a look at the CVS logs.

- General improvements:
  - Introduced negative tag patterns NO-REQUEST-TAG and NO-RESPONSE-TAG.
    They apply if no matching tag is found after parsing client or
    server headers.
  - Add support for external filters which allow to process the
    response body with a script or program written in any language
    the platform supports. External filters are enabled with
    +external-filter{} after they have been defined in one of the
    filter files with a header line starting with "EXTERNAL-FILTER:".
    External filter support is experimental, not compiled by default
    and known not to work on all platforms.
  - Add support for the 'PATCH' method as defined in RFC5789.
  - Reject requests with unsupported Expect header values.
    Fixes a couple of Co-Advisor tests.
  - Normalize the HTTP-version in forwarded requests and responses.
    This is an explicit RFC 2616 MUST and RFC 7230 mandates that
    intermediaries send their own HTTP-version in forwarded
    messages.
  - Server 'Keep-Alive' headers are no longer forwarded. From a user's
    point of view it doesn't really matter, but RFC 2616 (obsolete)
    mandates that the header is removed and this fixes a Co-Advisor
    complaint.
  - Change declared template file encoding to UTF-8. The templates
    already used a subset of UTF-8 anyway and changing the declaration
    allows to properly display UTF-8 characters used in the action files.
    This change may require existing action files with ISO-8859-1
    characters that aren't valid UTF-8 to be converted to UTF-8.
    Requested by Sam Chen in #582.
  - Do not pass rejected keep-alive timeouts to the server. It might
    not have caused any problems (we know of), but doing the right
    thing shouldn't hurt either.
  - Let log_error() use its own buffer size #define to make changing
    the log buffer size slightly less inconvenient.
  - Turned single-threaded into a "proper" toggle directive with arguments.
  - CGI templates no longer enforce new windows for some links.
  - Remove an undocumented workaround ('HOST' header removal) for
    an Apple iTunes bug that according to #729900 got fixed in 2003.

- Action file improvements:
  - The pattern 'promotions.' is no longer being blocked.
    Reported by rakista in #3608540.
  - Disable fast-redirects for .microsofttranslator.com/.
  - Disable filter{banners-by-size} for .dgb-tagungszentren.de/.
  - Add adn.speedtest.net as a site-specific unblocker.
    Support request #3612908.
  - Disable filter{banners-by-size} for creativecommons.org/.
  - Block requests to data.gosquared.com/. Reported by cbug in #3613653.
  - Unblock .conrad./newsletter/. Reported by David Bo in #3614238.
  - Unblock .bundestag.de/.
  - Unblock .rote-hilfe.de/.
  - Disable fast-redirects for .facebook.com/plugins/like.php.
  - Unblock Stackexchange popup URLs that aren't used to serve ads.
    Reported by David Wagner in #3615179.
  - Disable fast-redirects for creativecommons.org/.
  - Unblock .stopwatchingus.info/.
  - Block requests for .adcash.com/script/.
    Reported by Tyrexionibus in #3615289.
  - Disable HTML filters if the response was tagged as JavaScript.
    Filtering JavaScript code with filters intended to deal with HTML
    is usually a waste of time and, more importantly, may break stuff.
  - Use a custom redirect{} for .washingtonpost.com/wp-apps/imrs\.php\?src=
    Previously enabling the 'Advanced' settings (or manually enabling
    +fast-redirects{}) prevented some images from being loaded properly.
  - Unblock "adina*." Fixes #919 reported by Morton A. Goldberg.
  - Block '/.*DigiAd'.
  - Unblock 'adele*.'. Reported by Adele Lime in #1663.
  - Disable banners-by-size for kggp.de/.

- Filter file improvements & bug fixes:
  - Decrease the chances that js-annoyances creates invalid JavaScript.
    Submitted by John McGowan on ijbswa-users@.
  - Let the msn filter hide 'related' ads again.
  - Remove a stray '1' in the 'html-annoyances' filter.
  - Prevent img-reorder from messing up img tags with empty src
    attributes. Fixes #880 reported by Duncan.

- Documentation improvements:
  - Updated the 'Would you like to donate?' section.
  - Note that invalid forward-override{} parameter syntax isn't
    detected until the parameter is used.
  - Add another +redirect{} example: a shortcut for illumos bugs.
  - Make it more obvious that many operating systems support log
    rotation out of the box.
  - Fixed dead links. Reported by Mark Nelson in #3614557.
  - Rephrased the 'Why is the configuration so complicated?' answer
    to be slightly less condescending. Anonymously suggested in #3615122.
  - Be more explicit about accept-intercepted-requests's lack of MITM support.
  - Make 'demoronizer' FAQ entries more generic.
  - Add an example hostname to the --pre-chroot-nslookup description.
  - Add an example for a host pattern that matches an IP address.
  - Rename the 'domain pattern' to 'host pattern' as it may
    contain IP addresses as well.
  - Recommend forward-socks5t when using Tor. It seems to work fine and
    modifying the Tor configuration to profit from it hasn't been necessary
    for a while now.
  - Add another redirect{} example to stress that redirect loops can
    and should be avoided.
  - The usual spelling and grammar fixes. Parts of them were
    reported by Reuben Thomas in #3615276.
  - Mention the PCRS option letters T and D in the filter section.
  - Clarify that handle-as-empty-doc-returns-ok is still useful
    and will not be removed without replacement.
  - Note that security issues shouldn't be reported using the bug tracker.
  - Clarify what Privoxy does if both +block{} and +redirect{} apply.
  - Removed the obsolete bookmarklets section.

- Build system improvements:
  - Let --with-group properly deal with secondary groups.
    Patch submitted by Anatoly Arzhnikov in #3615187.
  - Fix web-actions target.
  - Add a web-faq target that only updates the FAQ on the webserver.
  - Remove already-commented-out non-portable DOSFILTER alternatives.
  - Remove the obsolete targets dok-put and dok-get.
  - Add a sf-shell target.

*** Version 3.0.21 stable ***

- Bug fixes:
  - On POSIX-like platforms, network sockets with file descriptor
    values above FD_SETSIZE are properly rejected. Previously they
    could cause memory corruption in configurations that allowed
    the limit to be reached.
  - Proxy authentication headers are removed unless the new directive
    enable-proxy-authentication-forwarding is used. Forwarding the
    headers potentially allows malicious sites to trick the user
    into providing them with login information.
    Reported by Chris John Riley.
  - Compiles on OS/2 again now that unistd.h is only included
    on platforms that have it.

- General improvements:
  - The show-status page shows the FEATURE_STRPTIME_SANITY_CHECKS status.
  - A couple of assert()s that could theoretically dereference
    NULL pointers in debug builds have been relocated.
  - Added an LSB info block to the generic start script.
    Based on a patch from Natxo Asenjo.
  - The max-client-connections default has been changed to 128
    which should be more than enough for most setups.

- Action file improvements:
  - Block rover.ebay./ar.*\&adtype= instead of "/.*\&adtype=" which
    caused too man false positives.
    Reported by u302320 in #360284, additional feedback from Adam Piggott.
  - Unblock '.advrider.com/' and '/.*ADVrider'.
    Anonymously reported in #3603636.
  - Stop blocking '/js/slider\.js'.
    Reported by Adam Piggott in #3606635 and _lvm in #2791160.

- Filter file improvements:
  - Added an iframes filter.

- Documentation improvements:
  - The whole GPLv2 text is included in the user manual now,
    so Privoxy can serve it itself and the user can read it
    without having to wade through GPLv3 ads first.
  - Properly numbered and underlined a couple of section titles
    in the config that where previously overlooked due to a flaw
    in the conversion script. Reported by Ralf Jungblut.
  - Improved the support instruction to hopefully make it harder to
    unintentionally provide insufficient information when requesting
    support. Previously it wasn't obvious that the information we need
    in bug reports is usually also required in support requests.
  - Removed documentation about packages that haven't been provided
    in years.

- Privoxy-Regression-Test:
  - Only log the test number when not running in verbose mode
    The position of the test is rarely relevant and it previously
    wasn't exactly obvious which one of the numbers was useful to
    repeat the test with --test-number.

- GNUmakefile improvements:
  - Factor generate-config-file out of config-file to make testing
    more convenient.
  - The clean target now also takes care of patch leftovers.

*** Version 3.0.20 beta ***

- Bug fixes:
  - Client sockets are now properly shutdown and drained before being
    closed. This fixes page truncation issues with clients that aggressively
    pipeline data on platforms that otherwise discard already written data.
    The issue mainly affected Opera users and was initially reported
    by Kevin in #3464439, szotsaki provided additional information to track
    down the cause.
  - Fix latency calculation for shared connections (disabled by default).
    It was broken since their introduction in 2009. The calculated latency
    for most connections would be 0 in which case the timeout detection
    failed to account for the real latency.
  - Reject URLs with invalid port. Previously they were parsed incorrectly and
    characters between the port number and the first slash were silently
    dropped as shown by curl test 187.
  - The default-server-timeout and socket-timeout directives accept 0 as
    valid value.
  - Fix a race condition on Windows that could cause Privoxy to become
    unresponsive after toggling it on or off through the taskbar icon.
    Reported by Tim H. in #3525694.
  - Fix the compilation on Windows when configured without IPv6 support.
  - Fix an assertion that could cause debug builds to abort() in case of
    socks5 connection failures with "debug 2" enabled.
  - Fix an assertion that could cause debug builds to abort() if a filter
    contained nul bytes in the replacement text.

- General improvements:
  - Significantly improved keep-alive support for both client and server
    connections.
  - New debug log level 65536 which logs all actions that were applied to
    the request.
  - New directive client-header-order to forward client headers in a
    different order than the one in which they arrived.
  - New directive tolerate-pipelining to allow client-side pipelining.
    If enabled (3.0.20 beta enables it by default), Privoxy will keep
    pipelined client requests around to deal with them once the current
    request has been served.
  - New --config-test option to let Privoxy exit after checking whether or not
    the configuration seems valid. The limitations noted in TODO #22 and #23
    still apply. Based on a patch by Ramkumar Chinchani.
  - New limit-cookie-lifetime{} action to let cookies expire before the end
    of the session. Suggested by Rick Sykes in #1049575.
  - Increase the hard-coded maximum number of actions and filter files from
    10 to 30 (each). It doesn't significantly affect Privoxy's memory usage
    and recompiling wasn't an option for all Privoxy users that reached the
    limit.
  - Add support for chunk-encoded client request bodies. Previously
    chunk-encoded request bodies weren't guaranteed to be forwarded correctly,
    so this can also be considered a bug fix although chunk-encoded request
    bodies aren't commonly used in the real world.
  - Add support for Tor's optimistic-data SOCKS extension, which can reduce the
    latency for requests on newly created connections. Currently only the
    headers are sent optimistically and only if the client request has already
    been read completely which rules out requests with large bodies.
  - After preventing the client from pipelining, don't signal keep-alive
    intentions. When looking at the response headers alone, it previously
    wasn't obvious from the client's perspective that no additional responses
    should be expected.
  - Stop considering client sockets tainted after receiving a request with body.
    It hasn't been necessary for a while now and unnecessarily causes test
    failures when using curl's test suite.
  - Allow HTTP/1.0 clients to signal interest in keep-alive through the
    Proxy-Connection header. While such client are rare in the real world, it
    doesn't hurt and couple of curl tests rely on it.
  - Only remove duplicated Content-Type headers when filters are enabled.
    If they are not it doesn't cause ill effects and the user might not want it.
    Downgrade the removal message to LOG_LEVEL_HEADER to clarify that it's not
    an error in Privoxy and is unlikely to cause any problems in general.
    Anonymously reported in #3599335.
  - Set the socket option SO_LINGER for the client socket.
  - Move several variable declarations to the beginning of their code block.
    It's required when compiling with gcc 2.95 which is still used on some
    platforms. Initial patch submitted by Simon South in #3564815.
  - Optionally try to sanity-check strptime() results before trusting them.
    Broken strptime() implementations have caused problems in the past and
    the most recent offender seems to be FreeBSD's libc (standards/173421).
  - When filtering is enabled, let Range headers pass if the range starts at
    the beginning. This should work around (or at least reduce) the video
    playback issues with various Apple clients as reported by Duc in #3426305.
  - Do not confuse a client hanging up with a connection time out. If a client
    closes its side of the connection without sending a request line, do not
    send the CLIENT_CONNECTION_TIMEOUT_RESPONSE, but report the condition
    properly.
  - Allow closing curly braces as part of action values as long as they are
    escaped.
  - On Windows, the logfile is now written before showing the GUI error
    message which blocks until the user acknowledges it.
    Reported by Adriaan in #3593603.
  - Remove an unreasonable parameter limit in the CGI interface. The new
    parameter limit depends on the memory available and is currently unlikely
    to be reachable, due to other limits in both Privoxy and common clients.
    Reported by Andrew on ijbswa-users@.
  - Decrease the chances of parse failures after requests with unsupported
    methods were sent to the CGI interface.

- Action file improvements:
  - Remove the comment that indicated that updated default.action versions
    are released on their own.
  - Block 'optimize.indieclick.com/' and 'optimized-by.rubiconproject.com/'
  - Unblock 'adjamblog.wordpress.com/' and 'adjamblog.files.wordpress.com/'.
    Reported by Ryan Farmer in #3496116.
  - Unblock '/.*Bugtracker'. Reported by pwhk in #3522341.
  - Add test URLs for '.freebsd.org' and '.watson.org'.
  - Unblock '.urbandictionary.com/popular'.
  - Block '.adnxs.com/'.
  - Block 'farm.plista.com/widgetdata.php'.
  - Block 'rotation.linuxnewmedia.com/'.
  - Block 'reklamy.sfd.pl/'. Reported by kacperdominik in #3399948.
  - Block 'g.adspeed.net/'.
  - Unblock 'websupport.wdc.com/'. Reported by Adam Piggot in #3577851.
  - Block '/openx/www/delivery/'.
  - Disable fast-redirects for '.googleapis.com/'.
  - Block 'imp.double.net/'. Reported by David Bo in #3070411.
  - Block 'gm-link.com/' which is used for email tracking.
    Reported by David Bo in #1812733.
  - Verify that requests to "bwp." are blocked. URL taken from #1736879
    submitted by Francois Marier.
  - Block '/.*bannerid='. Reported by Adam Piggott in #2975779.
  - Block 'cltomedia.info/delivery/' and '.adexprt.com/'.
    Anonymously reported in #2965254.
  - Block 'de17a.com/'. Reported by David Bo in #3061472.
  - Block 'oskar.tradera.com/'. Reported by David Bo in #3060596.
  - Block '/scripts/webtrends\.js'. Reported by johnd16 in #3002729.
  - Block requests for 'pool.*.adhese.com/'. Reported by johnd16 in #3002716.
  - Update path pattern for Coremetrics and add tests.
    Pattern and URLs submitted by Adam Piggott #3168443.
  - Enable +fast-redirects{check-decoded-url} for 'tr.anp.se/'.
    Reported by David Bo in #3268832.
  - Unblock '.conrad.se/newsletter/banners/'. Reported by David Bo in #3413824.
  - Block '.tynt.com/'. Reported by Dan Stahlke in #3421767.
  - Unblock '.bbci.co.uk/radio/'. Reported by Adam Piggott in #3569603.
  - Block requests to 'service.maxymiser.net/'.
    Reported by johnd16 in #3118401 (with a previous URL).
  - Disable fast-redirects for Google's "let's pretend your computer is
    infected" page.
  - Unblock '/.*download' to resolve actionsfile feedback #3498129.
    Submitted by Steven Kolins (soundcloud.com not working).
  - Unblock '.wlxrs.com/' which is required by hotmail.com.
    Fixes #3413827 submitted by David Bo.
  - Add two unblock patterns for popup radio and TV players.
    Submitted by Adam Piggott in #3596089.

- Filter file improvements & bug fixes:
  - Add a referer tagger.
  - Reduce the likelihood that the google filter messes up HTML-generating
    JavaScript. Reported by Zeno Kugy in #3520260.

- Documentation improvements:
  - Revised all OS X sections due to new packaging module (OSXPackageBuilder).
  - Update the list of supported operating systems to clarify that all Windows
    versions after 95 are expected to work and note that the platform-specific
    code for AmigaOS and QNX currently isn't maintained.
  - Update 'Signals' section, the only explicitly handled signals are SIGINT,
    SIGTERM and SIGHUP.
  - Add Haiku to the list of operating systems on which Privoxy is known to
    run.
  - Add DragonFly to the list of BSDs on which Privoxy is known to run.
  - Removed references to redhat-specific documentation set since it no longer
    exists.
  - Removed references to building PDFs since we no longer do so.
  - Multiple listen-address directives are supported since 3.0.18, correct the
    documentation to say so.
  - Remove bogus section about long and short being preferable to int.
  - Corrected some Internet JunkBuster references to Privoxy.
  - Removed references to www.junkbusters.com since it is no longer
    maintained. Reported by Angelina Matson.
  - Various grammar and spelling corrections
  - Add a client-header-tagger{} example for disabling filtering for range
    requests.
  - Correct a URL in the "Privoxy with Tor" FAQ.
  - Spell 'refresh-tags' correctly. Reported by Don in #3571927.
  - Sort manpage options alphabetically.
  - Remove an incorrect sentence in the toggle section. The toggle state
    doesn't affect whether or not the Windows version uses the tray icon.
    Reported by Zeno Kugy in #3596395.
  - Add new contributors since 3.0.19.

- Log message improvements:
  - When stopping to watch a client socket due to pipelining, additionally log
    the socket number.
  - Log the client socket and its condition before closing it. This makes it
    more obvious that the socket actually gets closed and should help when
    diagnosing problems like #3464439.
  - In case of SOCKS5 failures, do not explicitly log the server's response.
    It hasn't helped so far and the response can already be logged by enabling
    "debug 32768" anyway. This reverts v1.81 and the follow-up bug fix v1.84.
  - Relocate the connection-accepted message from listen_loop() to serve().
    This way it's printed by the thread that is actually serving the
    connection which is nice when grepping for thread ids in log files.

- Code cleanups:
  - Remove compatibility layer for versions prior to 3.0 since it has been
    obsolete for more than 10 years now.
  - Remove the ijb_isupper() and ijb_tolower() macros from parsers.c since
    they aren't used in this file.
  - Removed the 'Functions declared include:' comment sections since they tend
    to be incomplete, incorrect and out of date and the benefit seems
    questionable.
  - Various comment grammar and comprehensibility improvements.
  - Remove a pointless fflush() call in chat(). Flushing all streams pretty
    much all the time for no obvious reason is ridiculous.
  - Relocate ijb_isupper()'s definition to project.h and get the ijb_tolower()
    definition from there, too.
  - Relocate ijb_isdigit()'s definition to project.h.
  - Rename ijb_foo macros to privoxy_foo.
  - Add malloc_or_die() which will allow to simplify code paths where malloc()
    failures don't need to be handled gracefully.
  - Add strdup_or_die() which will allow to simplify code paths where strdup()
    failures don't need to be handled gracefully.
  - Replace strdup() calls with strdup_or_die() calls where it's safe and
    simplifies the code.
  - Fix white-space around parentheses.
  - Add missing white-space behind if's and the following parentheses.
  - Unwrap a memcpy() call in resolve_hostname_to_ip().
  - Declare pcrs_get_delimiter()'s delimiters[] static const.
  - Various optimisations to remove dead code and merge inefficient code
    structures for improved clarity, performance or code compactness.
  - Various data type corrections.
  - Change visibility of several code segments when compiling without
    FEATURE_CONNECTION_KEEP_ALIVE enabled for clarity.
  - In pcrs_get_delimiter(), do not use delimiters outside the ASCII range.
    Fixes a clang complaint.
  - Fix an error message in get_last_url() nobody is supposed to see.
    Reported by Matthew Fischer in #3507301.
  - Fix a typo in the no-zlib-support complaint. Patch submitted by Matthew
    Fischer in #3507304.
  - Shorten ssplit()'s prototype by removing the last two arguments. We always
    want to skip empty fields and ignore leading delimiters, so having
    parameters for this only complicates the API.
  - Use an enum for the type of the action value.
  - Rename action_name's member takes_value to value_type as it isn't used as
    boolean.
  - Turn family mismatches in match_sockaddr() into fatal errors.
  - Let enlist_unique_header() verify that the caller didn't pass a header
    containing either \r or \n.
  - Change the hashes used in load_config() to unsigned int. That's what
    hash_string() actually returns and using a potentially larger type
    is at best useless.
  - Use privoxy_tolower() instead of vanilla tolower() with manual casting of
    the argument.
  - Catch ssplit() failures in parse_cgi_parameters().

- Privoxy-Regression-Test:
  - Add an 'Overwrite condition' directive to skip any matching tests before
    it. As it has a global scope, using it is more convenient than clowning
    around with the Ignore directive.
  - Log to STDOUT instead of STDERR.
  - Include the Privoxy version in the output.
  - Various grammar and spelling corrections in documentation and code.
  - Additional tests for range requests with filtering enabled.
  - Tests with mostly invalid range request.
  - Add a couple of hide-if-modified-since{} tests with different date formats.
  - Cleaned up the format of the regression-tests.action file to match the
    format of default.action.
  - Remove the "Copyright" line from print_version(). When using --help, every
    line of screen space matters and thus shouldn't be wasted on things the
    user doesn't care about.

- Privoxy-Log-Parser:
  - Improve the --statistics performance by skipping sanity checks for input
    that shouldn't affect the results anyway. Add a --strict-checks option
    that enables some of the checks again, just in case anybody cares.
  - The distribution of client requests per connection is included in
    the --statistic output.
  - The --accept-unknown-messages option has been removed and the behavior
    is now the default.
  - Accept and (mostly) highlight new log messages introduced with
    Privoxy 3.0.20.

- uagen:
  - Bump generated Firefox version to 17.

- GNUmakefile improvements:
  - The dok-tidy target no longer taints documents with a tidy-mark
  - Change RA_MODE from 0664 to 0644. Suggested by Markus Dittrich in
    #3505445.
  - Remove tidy's clean flag as it changes the scope of attributes.
    Link-specific colors end up being applied to all text. Reported by Adam
    Piggott in #3569551.
  - Leave it up to the user whether or not smart tags are inserted.
  - Let w3m itself do the line wrapping for the config file. It works better
    than fmt as it can honour pre tags causing less unintentional line breaks.
  - Ditch a pointless '-r' passed to rm to delete files.
  - The config-file target now requires less manual intervention and updates
    the original config.
  - Change WDUMP to generate ASCII. Add WDUMP_UTF8 to allow UTF-8 in the
    AUTHORS file so the names are right.
  - Stop pretending that lynx and links are supported for the documentation.

- configure improvements:
  - On Haiku, do not pass -lpthread to the compiler. Haiku's pthreads
    implementation is contained in its system library, libroot, so no
    additional library needs to be searched.
    Patch submitted by Simon South in #3564815.
  - Additional Haiku-specific improvements. Disable checks intended for
    multi-user systems as Haiku is presently single-user. Group Haiku-specific
    settings in their own section, following the pattern for Solaris, OS/2 and
    AmigaOS. Add additional library-related settings to remove the need for
    providing configure with custom LDFLAGS.
    Submitted by Simon South in #3574538.

*** Version 3.0.19 Stable ***

- Bug fixes:
  - Prevent a segmentation fault when de-chunking buffered content.
    It could be triggered by malicious web servers if Privoxy was
    configured to filter the content and running on a platform
    where SIZE_T_MAX isn't larger than UINT_MAX, which probably
    includes most 32-bit systems. On those platforms, all Privoxy
    versions before 3.0.19 appear to be affected.
    To be on the safe side, this bug should be presumed to allow
    code execution as proving that it doesn't seems unrealistic.
  - Do not expect a response from the SOCKS4/4A server until it
    got something to respond to. This regression was introduced
    in 3.0.18 and prevented the SOCKS4/4A negotiation from working.
    Reported by qqqqqw in #3459781.

- General improvements:
  - Fix an off-by-one in an error message about connect failures.
  - Use a GNUMakefile variable for the webserver root directory and
    update the path. Sourceforge changed it which broke various
    web-related targets.
  - Update the CODE_STATUS description.

*** Version 3.0.18 Stable ***

- Bug fixes:
  - If a generated redirect URL contains characters RFC 3986 doesn't
    permit, they are (re)encoded. Not doing this makes Privoxy versions
    from 3.0.5 to 3.0.17 susceptible to HTTP response splitting (CWE-113)
    attacks if the +fast-redirects{check-decoded-url} action is used.
  - Fix a logic bug that could cause Privoxy to reuse a server
    socket after it got tainted by a server-header-tagger-induced
    block that was triggered before the whole server response had
    been read. If keep-alive was enabled and the request following
    the blocked one was to the same host and using the same forwarding
    settings, Privoxy would send it on the tainted server socket.
    While the server would simply treat it as a pipelined request,
    Privoxy would later on fail to properly parse the server's
    response as it would try to parse the unread data from the
    first response as server headers for the second one.
    Regression introduced in 3.0.17.
  - When implying keep-alive in client_connection(), remember that
    the client didn't. Fixes a regression introduced in 3.0.13 that
    would cause Privoxy to wait for additional client requests after
    receiving a HTTP/1.1 request with "Connection: close" set
    and connection sharing enabled.
    With clients which terminates the client connection after detecting
    that the whole body has been received it doesn't really matter,
    but with clients that don't the connection would be kept open until
    it timed out.
  - Fix a subtle race condition between prepare_csp_for_next_request()
    and sweep(). A thread preparing itself for the next client request
    could briefly appear to be inactive.
    If all other threads were already using more recent files,
    the thread could get its files swept away under its feet.
    So far this has only been reproduced while stress testing in
    valgrind while touching action files in a loop. It's unlikely
    to have caused any actual problems in the real world.
  - Disable filters if SDCH compression is used unless filtering is forced.
    If SDCH was combined with a supported compression algorithm, Privoxy
    previously could try to decompress it and ditch the Content-Encoding
    header even though the SDCH compression wasn't dealt with.
    Reported by zebul666 in #3225863.
  - Make a copy of the --user value and only mess with that when splitting
    user and group. On some operating systems modifying the value directly
    is reflected in the output of ps and friends and can be misleading.
    Reported by zepard in #3292710.
  - If forwarded-connect-retries is set, only retry if Privoxy is actually
    forwarding the request. Previously direct connections would be retried
    as well.
  - Fixed a small memory leak when retrying connections with IPv6
    support enabled.
  - Remove an incorrect assertion in compile_dynamic_pcrs_job_list()
    It could be triggered by a pcrs job with an invalid pcre
    pattern (for example one that contains a lone quantifier).
  - If the --user argument user[.group] contains a dot, always bail out
    if no group has been specified. Previously the intended, but undocumented
    (and apparently untested), behaviour was to try interpreting the whole
    argument as user name, but the detection was flawed and checked for '0'
    instead of '\0', thus merely preventing group names beginning with a zero.
  - In html_code_map[], use a numeric character reference instead of '
    which wasn't standardized before XHTML 1.0.
  - Fix an invalid free when compiled with FEATURE_GRACEFUL_TERMINATION
    and shut down through http://config.privoxy.org/die
  - In get_actions(), fix the "temporary" backwards compatibility hack
    to accept block actions without reason.
    It also covered other actions that should be rejected as invalid.
    Reported by Billy Crook.

- General improvements:
  - Privoxy can (re)compress buffered content before delivering
    it to the client. Disabled by default as most users wouldn't
    benefit from it.
  - The +fast-redirects{check-decoded-url} action checks URL
    segments separately. If there are other parameters behind
    the redirect URL, this makes it unnecessary to cut them off
    by additionally using a +redirect{} pcrs command.
    Initial patch submitted by Jamie Zawinski in #3429848.
  - When loading action sections, verify that the referenced filters
    exist. Currently missing filters only result in an error message,
    but eventually the severity will be upgraded to fatal.
  - Allow to bind to multiple separate addresses.
    Patch set submitted by Petr Pisar in #3354485.
  - Set socket_error to errno if connecting fails in rfc2553_connect_to().
    Previously rejected direct connections could be incorrectly reported
    as DNS issues if Privoxy was compiled with IPv6 support.
  - Adjust url_code_map[] so spaces are replaced with %20 instead of '+'
    While '+' can be used by client's submitting form data, this is not
    actually what Privoxy is using the lookups for. This is more of a
    cosmetic issue and doesn't fix any known problems.
  - When compiled without FEATURE_FAST_REDIRECTS, do not silently
    ignore +fast-redirect{} directives
  - Added a workaround for GNU libc's strptime() reporting negative
    year values when the parsed year is only specified with two digits.
    On affected systems cookies with such a date would not be turned
    into session cookies by the +session-cookies-only action.
    Reported by Vaeinoe in #3403560
  - Fixed bind failures with certain GNU libc versions if no non-loopback
    IP address has been configured on the system. This is mainly an issue
    if the system is using DHCP and Privoxy is started before the network
    is completely configured.
    Reported by Raphael Marichez in #3349356.
    Additional insight from Petr Pisar.
  - Privoxy log messages now use the ISO 8601 date format %Y-%m-%d.
    It's only slightly longer than the old format, but contains
    the full date including the year and allows sorting by date
    (when grepping in multiple log files) without hassle.
  - In get_last_url(), do not bother trying to decode URLs that do
    not contain at least one '%' sign. It reduces the log noise and
    a number of unnecessary memory allocations.
  - In case of SOCKS5 failures, dump the socks response in the log message.
  - Simplify the signal setup in main().
  - Streamline socks5_connect() slightly.
  - In socks5_connect(), require a complete socks response from the server.
    Previously Privoxy didn't care how much data the server response
    contained as long as the first two bytes contained the expected
    values. While at it, shrink the buffer size so Privoxy can't read
    more than a whole socks response.
  - In chat(), do not bother to generate a client request in case of
    direct CONNECT requests. It will not be used anyway.
  - Reduce server_last_modified()'s stack size.
  - Shorten get_http_time() by using strftime().
  - Constify the known_http_methods pointers in unknown_method().
  - Constify the time_formats pointers in parse_header_time().
  - Constify the formerly_valid_actions pointers in action_used_to_be_valid().
  - Introduce a GNUMakefile MAN_PAGE variable that defaults to privoxy.1.
    The Debian package uses section 8 for the man page and this
    should simplify the patch.
  - Deduplicate the INADDR_NONE definition for Solaris by moving it to jbsockets.h
  - In block_url(), ditch the obsolete workaround for ancient Netscape versions
    that supposedly couldn't properly deal with status code 403.
  - Remove a useless NULL pointer check in load_trustfile().
  - Remove two useless NULL pointer checks in load_one_re_filterfile().
  - Change url_code_map[] from an array of pointers to an array of arrays
    It removes an unnecessary layer of indirection and on 64bit system reduces
    the size of the binary a bit.
  - Fix various typos. Fixes taken from Debian's 29_typos.dpatch by Roland Rosenfeld.
  - Add a dok-tidy GNUMakefile target to clean up the messy HTML
    generated by the other dok targets.
  - GNUisms in the GNUMakefile have been removed.
  - Change the HTTP version in static responses to 1.1
  - Synced config.sub and config.guess with upstream
    2011-11-11/386c7218162c145f5f9e1ff7f558a3fbb66c37c5.
  - Add a dedicated function to parse the values of toggles. Reduces duplicated
    code in load_config() and provides better error handling. Invalid or missing
    toggle values are now a fatal error instead of being silently ignored.
  - Terminate HTML lines in static error messages with \n instead of \r\n.
  - Simplify cgi_error_unknown() a bit.
  - In LogPutString(), don't bother looking at pszText when not
    actually logging anything.
  - Change ssplit()'s fourth parameter from int to size_t.
    Fixes a clang complaint.
  - Add a warning that the statistics currently can't be trusted.
    Mention Privoxy-Log-Parser's --statistics option as
    an alternative for the time being.
  - In rfc2553_connect_to(), start setting cgi->error_message on error.
  - Change the expected status code returned for http://p.p/die depending
    on whether or not FEATURE_GRACEFUL_TERMINATION is available.
  - In cgi_die(), mark the client connection for closing.
    If the client will fetch the style sheet through another connection
    it gets the main thread out of the accept() state and should thus
    trigger the actual shutdown.
  - Add a proper CGI message for cgi_die().
  - Don't enforce a logical line length limit in read_config_line().
  - Slightly refactor server_last_modified() to remove useless gmtime*() calls.
  - In get_content_type(), also recognize '.jpeg' as JPEG extension.
  - Add '.png' to the list of recognized file extensions in get_content_type().
  - In block_url(), consistently use the block reason "Request blocked by Privoxy"
    In two places the reason was "Request for blocked URL" which hides the
    fact that the request got blocked by Privoxy and isn't necessarily
    correct as the block may be due to tags.
  - In listen_loop(), reload the configuration files after accepting
    a new connection instead of before.
    Previously the first connection that arrived after a configuration
    change would still be handled with the old configuration.
  - In chat()'s receive-data loop, skip a client socket check if
    the socket will be written to right away anyway. This can
    increase the transfer speed for unfiltered content on fast
    network connections.
  - The socket timeout is used for SOCKS negotiations as well which
    previously couldn't timeout.
  - Don't keep the client connection alive if any configuration file
    changed since the time the connection came in. This is closer to
    Privoxy's behaviour before keep-alive support for client connection
    has been added and also less confusing in general.
  - Treat all Content-Type header values containing the pattern
    'script' as a sign of text. Reported by pribog in #3134970.

- Action file improvements:
  - Moved the site-specific block pattern section below the one for the
    generic patterns so for requests that are matched in both, the block
    reason for the domain is shown which is usually more useful than showing
    the one for the generic pattern.
  - Remove -prevent-compression from the fragile alias. It's no longer
    used anywhere by default and isn't known to break stuff anyway.
  - Add a (disabled) section to block various Facebook tracking URLs.
    Reported by Dan Stahlke in #3421764.
  - Add a (disabled) section to rewrite and redirect click-tracking
    URLs used on news.google.com.
    Reported by Dan Stahlke in #3421755.
  - Unblock linuxcounter.net/.
    Reported by Dan Stahlke in #3422612.
  - Block 'www91.intel.com/' which is used by Omniture.
    Reported by Adam Piggott in #3167370.
  - Disable the handle-as-empty-doc-returns-ok option and mark it as deprecated.
    Reminded by tceverling in #2790091.
  - Add ".ivwbox.de/" to the "Cross-site user tracking" section.
    Reported by Nettozahler in #3172525.
  - Unblock and fast-redirect ".awin1.com/.*=http://".
    Reported by Adam Piggott in #3170921.
  - Block "b.collective-media.net/".
  - Widen the Debian popcon exception to "qa.debian.org/popcon".
    Seen in Debian's 05_default_action.dpatch by Roland Rosenfeld.
  - Block ".gemius.pl/" which only seems to be used for user tracking.
    Reported by johnd16 in #3002731. Additional input from Lee and movax.
  - Disable banners-by-size filters for '.thinkgeek.com/'.
    The filter only seems to catch pictures of the inventory.
  - Block requests for 'go.idmnet.bbelements.com/please/showit/'.
    Reported by kacperdominik in #3372959.
  - Unblock adainitiative.org/.
  - Add a fast-redirects exception for '.googleusercontent.com/.*=cache'.
  - Add a fast-redirects exception for webcache.googleusercontent.com/.
  - Unblock http://adassier.wordpress.com/ and http://adassier.files.wordpress.com/.

- Filter file improvements:
  - Let the yahoo filter hide '.ads'.
  - Let the msn filter hide overlay ads for Facebook 'likes' in search
    results and elements with the id 's_notf_div'. They only seem to be
    used to advertise site 'enhancements'.
  - Let the js-events filter additionally disarm setInterval().
    Suggested by dg1727 in #3423775.

- Documentation improvements:
  - Clarify the effect of compiling Privoxy with zlib support.
    Suggested by dg1727 in #3423782.
  - Point out that the SourceForge messaging system works like a black
    hole and should thus not be used to contact individual developers.
  - Mention some of the problems one can experience when not explicitly
    configuring an IP addresses as listen address.
  - Explicitly mention that hostnames can be used instead of IP addresses
    for the listen-address, that only the first address returned will be
    used and what happens if the address is invalid.
    Requested by Calestyo in #3302213.

- Log message improvements:
  - If only the server connection is kept alive, do not pretend to
    wait for a new client request.
  - Remove a superfluous log message in forget_connection().
  - In chat(), properly report missing server responses as such
    instead of calling them empty.
  - In forwarded_connect(), fix a log message nobody should ever see.
  - Fix a log message in socks5_connect(), a failed write operation
    was logged as failed read operation.
  - Let load_one_actions_file() properly complain about a missing
    '{' at the beginning of the file.
    Simply stating that a line is invalid isn't particularly helpful.
  - Do not claim to listen on a socket until Privoxy actually does.
    Patch submitted by Petr Pisar #3354485
  - Prevent a duplicated LOG_LEVEL_CLF message when sending out
    the "no-server-data" response.
  - Also log the client socket when dropping a connection.
  - Include the destination host in the 'Request ... marked for
    blocking. limit-connect{...} doesn't allow CONNECT ...' message
    Patch submitted by Saperski in #3296250.
  - Prevent a duplicated log message if none of the resolved IP
    addresses were reachable.
  - In connect_to(), do not pretend to retry if forwarded-connect-retries
    is zero or unset.
  - When a specified user or group can't be found, put the name in
    single-quotes when logging it.
  - In rfc2553_connect_to(), explain getnameinfo() errors better.
  - Remove a useless log message in chat().
  - When retrying to connect, also log the maximum number of connection
    attempts.
  - Rephrase a log message in compile_dynamic_pcrs_job_list().
    Divide the error code and its meaning with a colon. Call the pcrs
    job dynamic and not the filter. Filters may contain dynamic and
    non-dynamic pcrs jobs at the same time. Only mention the name of
    the filter or tagger, but don't claim it's a filter when it could
    be a tagger.
  - In a fatal error message in load_one_actions_file(), cover both
    URL and TAG patterns.
  - In pcrs_strerror(), properly report unknown positive error code
    values as such. Previously they were handled like 0 (no error).
  - In compile_dynamic_pcrs_job_list(), also log the actual error code as
    pcrs_strerror() doesn't handle all errors reported by pcre.
  - Don't bother trying to continue chatting if the client didn't ask for it.
    Reduces log noise a bit.
  - Make two fatal error message in load_one_actions_file() more descriptive.
  - In cgi_send_user_manual(), log when rejecting a file name due to '/' or '..'.
  - In load_file(), log a message if opening a file failed.
    The CGI error message alone isn't too helpful.
  - In connection_destination_matches(), improve two log messages
    to help understand why the destinations don't match.
  - Rephrase a log message in serve(). Client request arrival
    should be differentiated from closed client connections now.
  - In serve(), log if a client connection isn't reused due to a
    configuration file change.
  - Let mark_server_socket_tainted() always mark the server socket tainted,
    just don't talk about it in cases where it has no effect. It doesn't change
    Privoxy's behaviour, but makes understanding the log file easier.

- configure:
  - Added a --disable-ipv6-support switch for platforms where support
    is detected but doesn't actually work.
  - Do not check for the existence of strerror() and memmove() twice
  - Remove a useless test for setpgrp(2). Privoxy doesn't need it and
    it can cause problems when cross-compiling.
  - Rename the --disable-acl-files switch to --disable-acl-support.
    Since about 2001, ACL directives are specified in the standard
    config file.
  - Update the URL of the 'Removing outdated PCRE version after the
    next stable release' posting. The old URL stopped working after
    one of SF's recent site "optimizations". Reported by Han Liu.

- Privoxy-Regression-Test:
  - Added --shuffle-tests option to increase the chances of detection race conditions.
  - Added a --local-test-file option that allows to use Privoxy-Regression-Test without Privoxy.
  - Added tests for missing socks4 and socks4a forwarders.
  - The --privoxy-address option now works with IPv6 addresses containing brackets, too.
  - Perform limited sanity checks for parameters that are supposed to have numerical values.
  - Added a --sleep-time option to specify a number of seconds to
    sleep between tests, defaults to 0.
  - Disable the range-requests tagger for tests that break if it's enabled.
  - Log messages use the ISO 8601 date format %Y-%m-%d.
  - Fix spelling in two error messages.
  - In the --help output, include a list of supported tests and their default levels.
  - Adjust the tests to properly deal with FEATURE_TOGGLE being disabled.

- Privoxy-Log-Parser:
  - Perform limited sanity checks for command line parameters that
    are supposed to have numerical values.
  - Implement a --unbreak-lines-only option to try to revert MUA breakage.
  - Accept and highlight: Added header: Content-Encoding: deflate
  - Accept and highlight: Compressed content from 29258 to 8630 bytes.
  - Accept and highlight: Client request arrived in time on socket 21.
  - Highlight: Didn't receive data in time: a.fsdn.com:443
  - Accept log messages with ISO 8601 time stamps, too.

- uagen:
  - Bump generated Firefox version to 8.0.
  - Only randomize the release date if the new --randomize-release-date
    option is enabled. Firefox versions after 4 use a fixed date string
    without meaning.

*** Version 3.0.17 Stable ***

- Fixed last-chunk-detection for responses where the body was small
  enough to be read with the headers, causing Privoxy to wait for the
  end of the content until the server closed the connection or the
  request timed out. Reported by "Karsten" in #3028326.
- Responses with status code 204 weren't properly detected as body-less
  like RFC2616 mandates. Like the previous bug, this caused Privoxy to
  wait for the end of the content until the server closed the connection
  or the request timed out. Fixes #3022042 and #3025553, reported by a
  user with no visible name. Most likely also fixes a bunch of other
  AJAX-related problem reports that got closed in the past due to
  insufficient information and lack of feedback.
- Fixed an ACL bug that made it impossible to build a blacklist.
  Usually the ACL directives are used in a whitelist, which worked
  as expected, but blacklisting is still useful for public proxies
  where one only needs to deny known abusers access.
- Added LOG_LEVEL_RECEIVED to log the not-yet-parsed data read from the
  network. This should make debugging various parsing issues a lot easier.
- The IPv6 code is enabled by default on Windows versions that support it.
  Patch submitted by oCameLo in #2942729.
- In mingw32 versions, the user.filter file is reachable through the
  GUI, just like default.filter is. Feature request 3040263.
- Added the configure option --enable-large-file-support to set a few
  defines that are required by platforms like GNU/Linux to support files
  larger then 2GB. Mainly interesting for users without proper logfile
  management.
- Logging with "debug 16" no longer stops at the first nul byte which is
  pretty useless. Non-printable characters are replaced with their hex value
  so the result can't span multiple lines making parsing them harder then
  necessary.
- Privoxy logs when reading an action, filter or trust file.
- Fixed incorrect regression test markup which caused a test in
  3.0.16 to fail while Privoxy itself was working correctly.
  While Privoxy accepts hide-referer, too, the action name is actually
  hide-referrer which is also the name used one the final results page,
  where the test expected the alias.

- CGI interface improvements:
  - In finish_http_response(), continue to add the 'Connection: close'
    header if the client connection will not be kept alive.
    Anonymously pointed out in #2987454.
  - Apostrophes in block messages no longer cause parse errors
    when the blocked page is viewed with JavaScript enabled.
    Reported by dg1727 in #3062296.
  - Fix a bunch of anchors that used underscores instead of dashes.
  - Allow to keep the client connection alive after crunching the previous request.
    Already opened server connections can be kept alive, too.
  - In cgi_show_url_info(), don't forget to prefix URLs that only contain
    http:// or https:// in the path. Fixes #2975765 reported by Adam Piggott.
  - Show the 404 CGI page if cgi_send_user_manual() is called while
    local user manual delivery is disabled.

- Action file improvements:
  - Enable user.filter by default. Suggested by David White in #3001830.
  - Block .sitestat.com/. Reported by johnd16 in #3002725.
  - Block .atemda.com/. Reported by johnd16 in #3002723.
  - Block js.adlink.net/. Reported by johnd16 in #3002720.
  - Block .analytics.yahoo.com/. Reported by johnd16 in #3002713.
  - Block sb.scorecardresearch.com, too. Reported by dg1727 in #2992652.
  - Fix problems noticed on Yahoo mail and news pages.
  - Remove the too broad yahoo section, only keeping the
    fast-redirects exception as discussed on ijbswa-devel@.
  - Don't block adesklets.sourceforge.net. Reported in #2974204.
  - Block chartbeat ping tracking. Reported in #2975895.
  - Tag CSS and image requests with cautious and medium settings, too.
  - Don't handle view.atdmt.com as image. It's used for click-throughs
    so users should be able to "go there anyway".
    Reported by Adam Piggott in #2975927.
  - Also let the refresh-tags filter remove invalid refresh tags where
    the 'url=' part is missing. Anonymously reported in #2986382.
    While at it, update the description to mention the fact that only
    refresh tags with refresh times above 9 seconds are covered.
  - javascript needs to be blocked with +handle-as-empty-document to
    work around Firefox bug 492459.  So move .js blockers from
    +block{Might be a web-bug.} -handle-as-empty-document to
    +block{Might be a web-bug.} +handle-as-empty-document.
  - ijbswa-Feature Requests-3006719 - Block 160x578 Banners.
  - Block another omniture tracking domain.
  - Added a range-requests tagger.
  - Added two sections to get Flickr's Ajax interface working with
    default pre-settings. If you change the configuration to block
    cookies by default, you'll need additional exceptions.
    Reported by Mathias Homann in #3101419 and by Patrick on ijbswa-users@.

- Documentation improvements:
  - Explicitly mention how to match all URLs.
  - Consistently recommend socks5 in the Tor FAQ entry and mention
    its advantage compared to socks4a. Reported by David in #2960129.
  - Slightly improve the explanation of why filtering may appear
    slower than it is.
  - Grammar fixes for the ACL section.
  - Fixed a link to the 'intercepting' entry and add another one.
  - Rename the 'Other' section to 'Mailing Lists' and reword it
    to make it clear that nobody is forced to use the trackers
  - Note that 'anonymously' posting on the trackers may not always
    be possible.
  - Suggest to enable debug 32768 when suspecting parsing problems.

- Privoxy-Log-Parser improvements:
  - Gather statistics for ressources, methods, and HTTP versions
    used by the client.
  - Also gather statistics for blocked and redirected requests.
  - Provide the percentage of keep-alive offers the client accepted.
  - Add a --url-statistics-threshold option.
  - Add a --host-statistics-threshold option to also gather
    statistics about how many request where made per host.
  - Fix a bug in handle_loglevel_header() where a 'scan: ' got lost.
  - Add a --shorten-thread-ids option to replace the thread id with
    a decimal number.
  - Accept and ignore: Looks like we got the last chunk together
    with the server headers. We better stop reading.
  - Accept and ignore: Continue hack in da house.
  - Accept and higlight: Rejecting connection from 10.0.0.2.
    Maximum number of connections reached.
  - Accept and highlight: Loading actions file: /usr/local/etc/privoxy/default.action
  - Accept and highlight: Loading filter file: /usr/local/etc/privoxy/default.filter
  - Accept and highlight: Killed all-caps Host header line: HOST: bestproxydb.com
  - Accept and highlight: Reducing expected bytes to 0. Marking
    the server socket tainted after throwing 4 bytes away.
  - Accept: Merged multiple header lines to: 'X-FORWARDED-PROTO: http X-HOST: 127.0.0.1'

- Code cleanups:
  - Remove the next member from the client_state struct. Only the main
    thread needs access to all client states so give it its own struct.
  - Garbage-collect request_contains_null_bytes().
  - Ditch redundant code in unload_configfile().
  - Ditch LogGetURLUnderCursor() which doesn't seem to be used anywhere.
  - In write_socket(), remove the write-only variable write_len in
    an ifdef __OS2__ block. Spotted by cppcheck.
  - In connect_to(), don't declare the variable 'flags' on OS/2 where
    it isn't used. Spotted by cppcheck.
  - Limit the scope of various variables. Spotted by cppcheck.
  - In add_to_iob(), turn an interestingly looking for loop into a
    boring while loop.
  - Code cleanup in preparation for external filters.
  - In listen_loop(), mention the socket on which we accepted the
    connection, not just the source IP address.
  - In write_socket(), also log the socket we're writing to.
  - In log_error(), assert that escaped characters get logged
    completely or not at all.
  - In log_error(), assert that ival and sval have reasonable values.
    There's no reason not to abort() if they don't.
  - Remove an incorrect cgi_error_unknown() call in a
    cannot-happen-situation in send_crunch_response().
  - Clean up white-space in http_response definition and
    move the crunch_reason to the beginning.
  - Turn http_response.reason into an enum and rename it
    to http_response.crunch_reason.
  - Silence a 'gcc (Debian 4.3.2-1.1) 4.3.2' warning on i686 GNU/Linux.
  - Fix white-space in a log message in remove_chunked_transfer_coding().
    While at it, add a note that the message doesn't seem to
    be entirely correct and should be improved later on.

- GNUmakefile improvements:
  - Use $(SSH) instead of ssh, so one only needs to specify a username once.
  - Removed references to the action feedback thingy that hasn't been
    working for years.
  - Consistently use shell.sourceforge.net instead of shell.sf.net so
    one doesn't need to check server fingerprints twice.
  - Removed GNUisms in the webserver and webactions targets so they
    work with standard tar.

*** Version 3.0.16 Stable ***

- Added the config file option handle-as-empty-doc-returns-ok to
  work around Firefox bug #492459, which causes Firefox to hang
  if JavaScripts are blocked in certain situations. The option is
  enabled in the default config file.
- Added the config file option default-server-timeout to control the
  assumed default server timeout. Since Privoxy no longer returns
  an error message for connection resets on reused client connections,
  assuming larger server timeout values appears to actually work
  pretty well as long as connections aren't shared.
- Added optional support for FreeBSD's accf_http(9). Use the
  configure option --enable-accept-filter to enable it.
- Added fancier Privoxy icons for win32. Contributed by Jeff H.
- In daemon mode, fd 0, 1 and 2 are bound to /dev/null.
- Resolve localhost using whatever address family the operating
  system feels like. Previous betas would try to use IPv4 as this
  is what most users expect, but this didn't work reliably on
  GNU/Linux systems.
- In the action lists on CGI pages, actions and their parameters are
  no longer separated with a space. The action file parser doesn't
  actually allow this and will throw an invalid syntax error if actions
  and parameters in the action files are separated. Not adding the
  spaces means copy and pasting CGI output into the action files works.
- The default keep-alive timeout has been reduced to 5 seconds to work
  around hangs in clients that treat the proxy like any other host and
  stop allowing any new connections if the "maximum number of
  connections per host" is reached.
- Several webbug URLs that look like they are leading to images are now
  blocked as image instead of empty documents. Doing the latter causes
  WebKit-based clients to show a "missing image" icon which may mess up
  the layout.
- The no-such-domain template is used for DNS resolution
  problems with FEATURE_IPV6_SUPPORT enabled. Previously the
  connect-failed template was used. Reported by 'zebul666'.
- Accepts quoted expiration dates even though RFC 2109 10.1.2
  doesn't seem to allow them. Reported anonymously.
- Don't try to forget connections if connection sharing is disabled.
  This wasn't a real problem but caused an unnecessary log message.
- The still undocumented --enable-extended-host-patterns configure
  option has a better description.
- Fixed an error message that would claim a write to the server
  failed when actually writing to the client failed.
- Log the crunch reason before trying to write to the client.
  The log is easier to read that way.
- Several log messages about client connections also mention
  the socket number.
- handle-as-empty-document no longer depends on the image blocking
  code being enabled.
- Privoxy-Log-Parser is roughly 40% faster in highlighting mode.
- uagen, a Firefox User-Agent generator for Privoxy and Mozilla
  browsers has been imported and is available in the tarball's
  tools directory.
- The scripts in the tools directory treat unknown parameters
  as fatal errors.

*** Version 3.0.15 beta ***

- In case of missing server data, no error message is send to the
  client if the request arrived on a reused connection. The client
  is then supposed to silently retry the request without bothering
  the user. This should significantly reduce the frequency of the
  "No server or forwarder data received" error message many users
  reported.
- More reliable detection of prematurely closed client sockets
  with keep-alive enabled.
- FEATURE_CONNECTION_KEEP_ALIVE is decoupled from
  FEATURE_CONNECTION_SHARING and now available on
  all platforms.
- Improved handling of POST requests on reused connections.
  Should fix problems with stalled connections after submitting
  form data with some browser configurations.
- Fixed various latency calculation issues.
- Allows the client to pass NTLM authentication requests to a
  forwarding proxy. This was already assumed and hinted to work
  in 3.0.13 beta but actually didn't. Now it's confirmed to work
  with IE, Firefox and Chrome.
  Thanks to Francois Botha and Wan-Teh Chang
- Fixed a calculation problem if receiving the server headers
  takes more than two reads, that could cause Privoxy to terminate
  the connection prematurely. Reported by Oliver.
- Compiles again on platforms such as OpenBSD and systems
  using earlier glibc version that don't support AI_ADDRCONFIG.
  Anonymously submitted in #2872591.
- A bunch of MS VC project files and Suse and Redhat RPM spec
  files have been removed as they were no longer maintained for
  quite some time.
- Overly long action lines are properly rejected with a proper
  error message. Previously they would be either rejected as
  invalid or cause a core dump through abort().
- Already timed-out connections are no longer temporarily remembered.
  They weren't reused anyway, but wasted a socket slot.
- len refers to the number of bytes actually read which might
  differ from the ones received. Adjust log messages accordingly.
- The optional JavaScript on the CGI page uses encodeURIComponent()
  instead of escape() which doesn't encode all characters that matter.
  Anonymously reported in #2832722.
- Fix gcc45 warnings in decompress_iob().
- Various log message improvements.
- Privoxy-Regression-Test supports redirect tests.
- Privoxy-Log-Parser can gather some connection statistics.

*** Version 3.0.14 beta ***

- The latency is taken into account when evaluating whether or not to
  reuse a connection. This should significantly reduce the number of
  connections problems several users reported.
- If the server doesn't specify how long the connection stays alive,
  Privoxy errs on the safe side of caution and assumes it's only a second.
- The error pages for connection timeouts or missing server data use a
  Last-Modified date in the past. Retry attempts are detected and Privoxy
  removes the If-Modified-Since header to prevent the server from responding
  with status code 304 in which case the client would reuse the error message.
- Setting keep-alive-timeout to 0 disables keep-alive support. Previously
  Privoxy would claim to allow persistence but not reuse the connection.
- Pipelined requests are less likely to be mistaken for the request
  body of the previous request. Note that Privoxy still has no real
  pipeline support and will either serialize pipelined requests or
  drop them in which case the client has to resent them.
- Fixed a crash on some Windows versions when header randomization
  is enabled and the date couldn't be parsed.
- Privoxy's keep-alive timeout for the current connection is reduced
  to the one specified in the client's Keep-Alive header.
- For HTTP/1.1 requests, Privoxy implies keep-alive support by not
  setting any Connection header instead of using 'Connection: keep-alive'.
- If the socket isn't reusable, Privoxy doesn't temporarily waste
  a socket slot to remember the connection.
- If keep-alive support is disabled but compiled in, the client's
  Keep-Alive header is removed.
- Fixed a bug on mingw32 where downloading large files failed if
  keep-alive support was enabled.
- Fixed a bug that (at least theoretically) could cause log
  timestamps to be occasionally off by about a second.
- No Proxy-Connection header if added if there already is one.
- The configure script respects the $PATH variable when searching
  for groups and id.

*** Version 3.0.13 beta ***

- Added IPv6 support. Thanks to Petr Pisar who not only provided
  the initial patch but also helped a lot with the integration.
- Added client-side keep-alive support.
- The connection sharing code is only used if the connection-sharing
  option is enabled.
- The max-client-connections option has been added to restrict
  the number of client connections below a value enforced by
  the operating system.
- Fixed a regression reintroduced in 3.0.12 that could cause
  crashes on mingw32 if header date randomization was enabled.
- Compressed content with extra fields couldn't be decompressed
  and would get passed to the client unfiltered. This problem
  has only be detected through statical analysis with clang as
  nobody seems to be using extra fields anyway.
- If the server resets the Connection after sending only the headers
  Privoxy forwards what it got to the client. Previously Privoxy
  would deliver an error message instead.
- Error messages in case of connection timeouts use the right
  HTTP status code.
- If spawning a child to handle a request fails, the client
  gets an error message and Privoxy continues to listen for
  new requests right away.
- The error messages in case of server-connection timeouts or
  prematurely closed server connections are now template-based.
- If zlib support isn't compiled in, Privoxy no longer tries to
  filter compressed content unless explicitly asked to do so.
- In case of connections that are denied based on ACL directives,
  the memory used for the client IP is no longer leaked.
- Fixed another small memory leak if the client request times out
  while waiting for client headers other than the request line.
- The client socket is kept open until the server socket has
  been marked as unused. This should increase the chances that
  the still-open connection will be reused for the client's next
  request to the same destination. Note that this only matters
  if connection-sharing is enabled.
- A TODO list has been added to the source tarball to give potential
  volunteers a better idea of what the current goals are. Donations
  are still welcome too: https://www.privoxy.org/faq/general.html#DONATE

*** Version 3.0.12 ***

- The socket-timeout option now also works on platforms whose
  select() implementation modifies the timeout structure.
  Previously the timeout was triggered even if the connection
  didn't stall. Reported by cyberpatrol.
- The Connection: keep-alive code properly deals with files
  larger than 2GB. Previously the connection was closed too
  early.
- The content length for files above 2GB is logged correctly.
- The user-manual directive on the show-status page links to
  the documentation location specified with the directive,
  not to the Privoxy website.
- When running in daemon mode, Privoxy doesn't log anything
  to the console unless there are errors before the logfile
  has been opened.
- The show-status page prints warnings about invalid directives
  on the same line as the directives themselves.
- Fixed several justified (but harmless) compiler warnings,
  mostly on 64 bit platforms.
- The mingw32 version explicitly requests the default charset
  to prevent display problems with some fonts available on more
  recent Windows versions. Patch by Burberry.
- The mingw32 version uses the Privoxy icon in the alt-tab
  windows. Patch by Burberry.
- The timestamp and the thread id is omitted in the "Fatal error"
  message box on mingw32.
- Fixed two related mingw32-only buffer overflows. Triggering
  them required control over the configuration file, therefore
  this isn't seen as a security issue.
- In verbose mode, or if the new option --show-skipped-tests
  is used, Privoxy-Regression-Test logs skipped tests and the
  skip reason.

*** Version 3.0.11 ***

- On most platforms, outgoing connections can be kept alive and
  reused if the server supports it. Whether or not this improves
  things depends on the connection.
- When dropping privileges, membership in supplementary groups
  is given up as well. Not doing that can lead to Privoxy running
  with more rights than necessary and violates the principle of
  least privilege. Users of the --user option are advised to update.
  Thanks to Matthias Drochner for reporting the problem,
  providing the initial patch and testing the final version.
- Passing invalid users or groups with the --user option
  didn't lead to program exit. Regression introduced in 3.0.7.
- The match all section has been moved from default.action
  to a new file called match-all.action. As a result the
  default.action no longer needs to be touched by the user
  and can be safely overwritten by updates.
- The standard.action file has been removed. Its content
  is now part of the default.action file.
- In some situations the logged content length was slightly too low.
- Crunched requests are logged with their own log level.
  If you used "debug 1" in the past, you'll probably want
  to additionally enable "debug 1024", otherwise only passed
  requests will be logged. If you only care about crunched
  requests, simply replace "debug 1" with "debug 1024".
- The crunch reason has been moved to the beginning of the
  crunch message. For HTTP URLs, the protocol is logged as well.
- Log messages are shortened by printing the thread id on its
  own (as opposed to putting it inside the string "Privoxy()").
- The config option socket-timeout has been added to control
  the time Privoxy waits for data to arrive on a socket.
- Support for remote toggling is controlled by the configure
  option --disable-toggle only. In previous versions it also
  depended on the action editor and thus configuring with the
  --disable-editor option would disable remote toggling support
  as well.
- Requests with invalid HTTP versions are rejected.
- The template symbol @date@ can be used to include a date(1)-like
  time string. Initial patch submitted by Endre Szabo.
- Responses from shoutcast servers are accepted again.
  Problem reported and fix suggested by Stefan.
- The hide-forwarded-for-headers action has been replaced with
  the change-x-forwarded-for{} action which can also be used to
  add X-Forwarded-For headers. The latter functionality already
  existed in Privoxy versions prior to 3.0.7 but has been removed
  as it was often used unintentionally (by not using the
  hide-forwarded-for-headers action).
- A "clear log" view option was added to the mingw32 version
  to clear out all of the lines in the Privoxy log window.
  Based on a patch submitted by T Ford.
- The mingw32 version uses "critical sections" now, which prevents
  log message corruption under load. As a side effect, the
  "no thread-safe PRNG" warning could be removed as well.
- The mingw32 version's task bar icon is crossed out and
  the color changed to gray if Privoxy is toggled off.

*** Version 3.0.10 ***

- Ordinary configuration file changes no longer cause program
  termination on OS/2 if the name of the logfile hasn't been
  changed as well. This regression probably crept in with the
  logging improvements in 3.0.7. Reported by Maynard.
- The img-reorder filter is less likely to mess up JavaScript code in
  img tags. Problem and solution reported by Glenn Washburn in #2014552.
- The source tar ball now includes Privoxy-Log-Parser,
  a syntax-highlighter for Privoxy logs. For fancy screenshots see:
  http://www.fabiankeil.de/sourcecode/privoxy-log-parser/
  Documentation is available through perldoc(1).

*** Version 3.0.9 beta ***

- Added SOCKS5 support (with address resolution done by
  the SOCKS5 server). Patch provided by Eric M. Hopper.
- The "blocked" CGI pages include a block reason that was
  provided as argument to the last-applying block action.
- If enable-edit-actions is disabled (the default since 3.0.7 beta)
  the show-status page hides the edit buttons and explains why.
  Previously the user would get the "this feature has been disabled"
  message after using the edit button.
- Forbidden CONNECT requests are treated like blocks by default.
  The now-pointless treat-forbidden-connects-like-blocks action
  has been removed.
- Not enabling limit-connect now allows CONNECT requests to all ports.
  In previous versions it would only allow CONNECT requests to port 443.
  Use +limit-connect{443} if you think you need the old default behaviour.
- The CGI editor gets turned off after three edit requests with invalid
  file modification timestamps. This makes life harder for attackers
  who can leverage browser bugs to send fake Referers and intend to
  brute-force edit URLs.
- Action settings for multiple patterns in the same section are
  shared in memory. As a result these sections take up less space
  (and are loaded slightly faster). Problem reported by Franz Schwartau.
- Linear white space in HTTP headers will be normalized to single
  spaces before parsing the header's content, headers split across
  multiple lines get merged first. This should prevent problems like:
   * letting the session-cookies-only action slip
     some Cookies through unmodified,
   * only suppressing the first line of a header,
     thus creating an invalid one, and
   * to incorrectly block headers with valid timestamps
     that weren't properly recognized.
  Headers that could trigger these problems are unlikely to appear
  in "normal" web traffic, but could be intentionally generated to
  fool some of Privoxy's header parsers.
- Host information is gathered outside the main thread so it's less
  likely to delay other incoming connections if the host is misconfigured.
- New config option "hostname" to use a hostname other than
  the one returned by the operating system. Useful to speed-up responses
  for CGI requests on misconfigured systems. Requested by Max Khon.
- The CGI editor supports the "disable all filters of this type"
  directives "-client-header-filter", "-server-header-filter",
  "-client-header-tagger" and "-server-header-tagger".
- Fixed false-positives with the link-by-url filter and URLs that
  contain the pattern "/jump/".
- The less-download-windows filter no longer messes
  "Content-Type: application/x-shockwave-flash" headers up.
- In the show-url-info page's "Final results" section active and
  inactive actions are listed separately. Patch provided by Lee.
- The GNUmakefile supports the DESTDIR variable. Patch for
  the install target submitted by Radoslaw Zielinski.
- Embedding the content of configuration files in the show-status
  page is significantly faster now. For a largish action file (1 MB)
  a speedup of about 2450 times has been measured. This is mostly
  interesting if you are using large action files or regularly use
  Privoxy-Regression-Test while running Privoxy through Valgrind,
  for stock configuration files it doesn't really matter.
- If zlib support is unavailable and there are content
  filters active but the prevent-compression action is disabled,
  the show-url-info page includes a warning that compression
  might prevent filtering.
- The show-url-info page provides an OpenSearch Description that
  allows to access the page through browser search plugins.
- Custom client-header filters that rewrite the request line
  incorrectly no longer cause Privoxy to crash. Reported by din_a4.
- The obsolete kill-popups action has been removed as the
  PCRS-based popup filters can do the same and are slightly
  less unreliable.
- The inspect-jpegs action has been removed.
- The send-wafer and send-vanilla-wafer actions have been removed.
  They weren't particular useful and their behaviour could be emulated
  with add-header anyway.
- Privoxy-Regression-Test has been significantly improved.
- Most sections in the default.action file contain tests for
  Privoxy-Regression-Test to verify that they are working as intended.
- Parts of Privoxy have been refactored to increase maintainability.
- Building with zlib (if available) is done by default.

*** Version 3.0.8 ***

- Fixed a small memory leak when listen-address only specifies the port.
- The source tar balls now include Privoxy-Regression-Test which
  (upon other things) can be used to automatically detect some
  packaging problems. Packagers are welcome to give it a try.
- Reverted a change in 3.0.7 that caused path patterns to be checked
  even if the host pattern match already failed. While this doesn't
  noticeable affect the performance, it makes it less likely to run
  out of stack space with overly-complex path patterns the user might
  have added.
- Updated the msn, yahoo and google filters to work as advertised again.
- The warning message shown by the show-status CGI page is easier to
  understand. Previously it wasn't clear that the error message
  is shown below the invalid directive. (Reported by Lee)
- When regenerating Content-Disposition headers the more common
  spelling is used for the name. Previously it was written without caps.
- Less confusing log message if the content type isn't overwritten
  because force-text-type wasn't used but the old type doesn't look
  like content that would be filtered normally.
- Better log messages if the user tries to execute filters that
  don't exist.
- Treat the non-standard Request-Range headers like standard range
  headers and suppress them if content filtering is enabled.
- Prevent the log messages for CONNECT requests to unacceptable
  ports from printing the limit-connect argument as [null] if
  limit-connect hasn't been explicitly enabled.
- Don't disable the mingw32 log window if the logfile directive
  isn't used. While it was an intentional change in 3.0.7 at least
  one user perceived it as a regression and the same effect can
  be achieved by disabling all debug directives.
- Fixed two minor problems related to the win32 build process: a css
  file was not being in the installer and the trustfile comment in the
  config.txt referenced a nonexisting file
- Minor documentation fixes.

*** Version 3.0.7 beta ***

- Added zlib support to filter content with gzip and deflate
  encoding. (Patch provided by Wil Mahan)
- Dedicated filters and actions are used for header filtering.
  "filter-client-headers" and "filter-client-headers" are no longer
  supported, use server-header-filter{} and client-header-filter{}
  instead.
- Tags can be used to change actions based on HTTP headers.
- New server-header filter: less-download-windows.
- New client-header taggers: css-requests, image-requests,
  client-ip-address, http-method, allow-post, complete-url,
  user-agent and privoxy-control.
- New server-header taggers: content-type and privoxy-control.
- The forward-override{} action allows to change the forwarding
  settings through the action files, for example based on client
  headers like the User-Agent, or the request origin.
- Socks errors are no longer handled by the CGI page for
  DNS resolution failures.
- CGI pages use favicons to signal whether they are error
  or control pages. This is useful if you rely heavily on
  browser tabs.
- The show-url-info CGI page shows the forwarding settings.
- "Crunch!" log messages (used when Privoxy answers requests
  by itself) now also contain the reason.
- Allow to rewrite the request destination behind the client's back.
- Fix socks requests on big-endian platforms. Patch provided by Song Weijia.
- Fixes possible deadlocks and crashes on OpenBSD.
  Patch provided by Ralf Horstmann.
- The CGI action editor allows to edit actionfiles with previously
  forbidden characters like dots.
- New trust entries are saved with a comment that contains the
  trusted referring URL (Suggested by Daniel Griscom).
- Filter descriptions are HTML encoded automatically.
- New config option "split-large-forms" to work
  around a browser bug that caused IE6 and IE7 to ignore
  the Submit button on the edit-actions-for-url CGI page.
- New config option "allow-cgi-request-crunching" to allow
  requests for Privoxy's CGI pages to be blocked, redirected
  or (un)trusted like ordinary requests.
- Empty filter files no longer interrupt the filtering process
  prematurely and are correctly listed on the show-status CGI page.
- New config option "accept-intercepted-requests" to combine
  Privoxy with any packet filter to build an intercepting proxy
  for HTTP/1.1 requests (and for HTTP/1.0 requests with Host header set).
- fast-redirects{} catch redirects to https URLs as well.
- redirect{s@foo@bar@} can be used to redirect to a rewritten
  version of the original URL.
- Trap unsupported gopher proxy requests.
- Fixed a bug in the User Manual delivery on Windows
  (mingw32 only). Images now show up correctly and HTML
  pages are no longer padded with garbage data.
- Fixed several minor memory leaks, most of them discovered with Valgrind.
- Only unlink the pidfile if it's actually used.
- Retries after connection problems with forced requests
  aren't blocked again.
- On Unix SIGABRT causes a core dump as expected and is no
  longer treated as normal shutdown signal.
- The "access denied" CGI page is more descriptive and
  allows retries to circumvent the referrer check.
- Updated PCRS to handle unexpected PCRE errors properly.
  Fixed crashes that could occur if Privoxy was build
  with external PCRE versions newer than Privoxy's internal
  one. (Reported by Chung-chieh Shan)
- Fixed crashes with null bytes in PCRS replacement strings
  (Patch provided by Felix Gröbert).
- Fixed crashes with header time randomization on mingw32.
- The CGI style sheet is no longer delivered if the referring
  page isn't a Privoxy CGI page. This prevents a JavaScript-based
  Privoxy detection "attack". Note that detecting Privoxy is
  still possible through other ways and Privoxy was never intended
  to be invisible anyway.
- Added support for AmigaOS 4, fixed build for AmigaOS 3.x.
- The show-url-info CGI page displays a warning if Privoxy
  is currently toggled off.
- The show-status CGI page suppresses the edit button
  for action files if Privoxy has no write access.
- Most CGI error pages react properly to HEAD requests.
- Requests with RFC 3253 HTTP methods (used by Subversion)
  are accepted. (Patch provided by Petr Kadlec)
- New config option "templdir" to change the location
  of the CGI templates to make sure customized templates
  aren't "updated".
- Better handling of "HTTP/1.1 100 Continue" responses.
- The background of the PNG pattern is transparent.
- Fixed XML syntax errors caused by banners-by-size and banners-by-url.
- Fixed crashes and possible action file corruptions
  when lines containing hashes are written through the CGI editor.
- Supports dynamic filters which can contain variables.
- Supports tags to change the actions based on client or server headers.
- Incorrect actions are logged before program termination.
- The "actionsfile" syntax in the configuration file is consistent
  with the rest of the configuration options and requires the
  whole file name. This is an incompatible change, if you use
  an old configuration file you might have to append ".action"
  to your "actionsfile" directives.
- With the configuration file option "enforce-blocks" the
  "go there anyway" mechanism can be disabled without recompiling
  Privoxy.
- More precise error messages in case of incorrect acl syntax.
- Logs a warning if filtering is enabled but impossible due
  to lack of zlib support or use of the prevent-compression action.
- Less noisy handling of Cookie:" and "Connection:" headers.
- Improved error messages in case of connection problems.
- Fix a command-line-parsing bug that was introduced before 3.0.5
  beta and caused Privoxy to treat the last argument as configuration
  file if no configuration file was specified.
- Treat unknown command line options as fatal errors instead
  of silently ignoring them.
- Use string functions with length checks more often.
- Don't log CONNECT requests twice.
- Allow to log the source address for ACL-related connection drops.
- Don't ignore applying filters if the server didn't
  specify a Content-Type. Bug reported by Amuro Namie.
- Rejected CONNECT requests are logged with log level info
  (enabled by default) and the reason for the block.
- New command line option "--pre-chroot-nslookup hostname" to
  intialize the resolver library before chroot'ing. On some systems this
  reduces the number of files that must be copied into the chroot tree.
  (Patch provided by Stephen Gildea)
- Fix a long-standing memory corruption bug that could cause
  Privoxy to overwrite a single byte in memory it didn't explicitly
  allocate (but that probably was allocated anyway due to bucket size).
- Send template-based CGI pages as HTTP/1.1 unless the client
  asked for HTTP/1.0.
- Let the first line in connection established responses
  end in \r\n as required by RFC1945. Reported by Bert van Leeuwen.
- If no log file has been specified, disable logging instead of logging
  to stderr.
- Don't block stderr when in daemon mode.
- Ignore missing zero-chunks when filtering chunk-encoded content.
  Earlier Privoxy versions would buffer and then forward the content
  unmodified which caused some browsers to simply show empty pages.
- Fix double free in cgi_edit_actions_list(). Reported by Venustech AD-LAB.
- The code to add X-Forwarded-For headers when the hide-forwarded-for-headers
  action isn't being used has been removed.
- Fixed trustfile feature which previously didn't work without FEATURE_TOGGLE.
  Reported by Lee.
- Minor code clean-ups, filter and action file updates.
  (Some of them reported by Davide Alberani, Markus Elfring,
   Stefan Huehner and Adam Piggott)

*** Version 3.0.6 ***

- New content filters: no-ping, google, msn, yahoo and blogspot.
- New header filters:  x-httpd-php-to-html, html-to-xml, xml-to-html
                       and hide-tor-exit-notation.
- The special header "X-Filter: No" now disables header filtering as well.
- Improved the filters img-reorder, js-annoyances, webbugs,
  banners-by-size, banners-by-link and ie-exploits to make them
  less likely to break anything.
- Removed outdated URL patterns in default.action and added new ones.
- Added redirection from http://p.p/user-manual to http://p.p/user-manual/
- Changed webinterface default values for hide-user-agent, hide-referrer
  and set-image-blocker.

*** Version 3.0.5 beta ***

- Windows version can be installed/started as a service.
- Windows icon stays blue when Privoxy is idle, green when busy.
- Integrated Fabian Keil's extensive patch.  See:
  http://www.fabiankeil.de/sourcecode/privoxy/. Includes the
  following new or significantly improved actions (among many
  other improvements):

     content-type-overwrite{}
     crunch-client-header{string}
     crunch-if-none-match
     crunch-server-header{string}
     fast-redirects{check-decoded-url}
     filter-client-headers
     filter-server-headers
     force-text-mode
     handle-as-empty-document
     hide-accept-language{}
     hide-content-disposition{}
     hide-if-modified-since
     hide-referrer{conditional-block}
     overwrite-last-modified{}
     redirect{URL}
     treat-forbidden-connects-like-blocks

- Standard-compliant clients are prevented from displaying cached
  copies of Privoxy's error messages after the cause of the problem
  has gone.
- Improved DNS error handling.
- Multiple filter files can now be specified in config.
- Added jpeg filtering to defend against MS jpeg vulnerability MS04-028
  with the new inspect-jpegs action.
- Removed the "arbitrary" 1000 filter limit - addresses tracker #911950
- Thanks to Jindrich Makovicka for a race condition fix for the log
  file.  The race condition remains for non-pthread implementations.
  Reference patch #1175720. Various other logging enhancements.
- A pile of assorted bug fixes, memory leaks, enhancements, etc.
- Moved Actions file reporting mechanism to SF tracker.
- Two new options for config: enable-remote-http-toggle and
  forwarded-connect-retries.
- Trap unsupported FTP requests.
- Let text/xml be filtered.
- Numerous updates to default.action
- Increase the compiled in limit of trusted referrers from 64 to 512
  (for trustfile users).

*** Version 3.0.3 ***

- Fixed yet another two memory leaks. Process growth seems stopped now.
- Further tightened security against malicious toggle-off links.
- Excluded text/plain MIME types from filtering. This fixes a
  couple of client-crashing, download corruption and
  Privoxy performance issues, whose root cause lies in
  web servers labelling content of unknown type as text/plain.
- Assorted fixes for POSIX compliance, signal handling, graceful
  termination, compiler warnings, OSX support, Win32 systray,
  error logging, hostname wildcards, correct detection of NetBSD.
- Workarounds for client (iTunes etc) and server (PHP < 4.2.3) bugs
  including the notorious "blank page" problem.
- Various filter improvements; most notably the unsolicited-popups
  filter became less destructive
- Major revamp of the actions file

*** Version 3.0.2 ***

- Fixed two memory leaks, one serious
- Fixed bug in pcrs which could cause crashes with user-defined filters
- Fixed bug in domain name matching
- Assorted small fixes (Win32 menu, CGI URL editor, ..)
- Added basic support for the OPTIONS and TRACE http methods
- Added workaround for Bug in Mac OSX that made Privoxy crash occasionally
- Refined the default action file through >400 items of user feedback
- Filter changes:
  - Assorted refinements, optimizations and fixes in the js-annoyances,
    img-reorder, banners-by-size, banners-by-link, webbugs, refresh-tags,
    html-annoyances, content-cookies and fun filters
  - Replaced filter "popups" by choice between two modes:
    - "unsolicited-popups" tries to catch only the unsolicited ones
    - "all-popups" tries to kill them all (as before)
  - New filter "tiny-textforms" Help those tiny or hard-wrap textareas.
  - New filter "jumping-windows" that prevents windows from resizing
    and moving themselves
  - New filter "demoronizer" which fixes MS's abuse of std charsets
    (common cases anyway).
  - Replaced "nimda" with more general "ie-exploits" filter in which
    all filters for exploits shall be collected
- Improved cookie logging
- Rewrote make install target. Added uninstall and install-strip
  targets.
- Fixed a potential (application-level, NOT OS-level!) security
  problem involving remote toggling and action file manipulation
  by mailicious websites.
- Added ability to chroot (thanks to Sviatoslav Sviridov)
- Added more action aliases for prehistoric action names
- Add Slackware support to Makefile.

*** Version 3.0  ***

- Fixed Windows startmenu items, log window and tray icon menus.
- Added warning for bogus install target
- Added quicktime-kioskmode filter and improved frameset-borders
- Updated default.action based on latest feedback
- New PDF doc build process
- Add a user contrib module to cvs:
  http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/ijbswa/contrib/

*** Version 2.9.18  ***

- Added workaround for IE bug that broke CGI interface
- Bugfix: String actions now reliably editable through CGI interface
- Three filters fixed (again!)
- Assorted small fixes and doc enhancements

*** Version 2.9.16  ***

- Major revamp of default.action to get rid of years of cruft.
- Same for default.filter
- Re-design and major improvements to the CGI editor interface.
- Address spurious 'out of memory' error due to incorrect file permissions.
- Impose buffer limits while reading client and server headers.
- Better memory and CPU optimization.
- Add Conectiva Linux package.
- user-manual directive added to config for help links from within CGI
  editor.
- Multiple actions files can now be specified in config.
- Actions files are changed to: default.action, standard.action, and
  user.action. user.action is for personal/local configuration.
- The usual many small and miscellaneous bug and security fixes.

*** Version 2.9.14 beta ***

- Fix Solaris compile problem (gateway.h and filters.h)
- Makefile fixes for Solaris, FreeBSD (?)
- Fix build failure where certain features were disabled.
- 'blocked-compact' template is removed. Various CGI improvements,
  including an adaptive 'blocked' template.
- Various tweaks for actions file to get ready for stable 3.0
- Included a 'Bookmarklet' and PHP scripts for reporting actions file
  problems via web interface at privoxy.org. Accessed via internal CGIs.
- Include cgi-style.css for templates.
- #include mechansim for common text in templates
- Various other minor fixes.

*** Version 2.9.13 beta ***

- *NEWS*: The project has been renamed to Privoxy! The new name is
  reflected throughout (file locations, etc).
- ijb.action is now default.action. re_filterfile is now
  default.filter.
- http://i.j.b/ is now http://p.p/
- The 'logo' option for replacing ad iamges is removed now. 'Pattern'
  (checkerboard) is now the default.
- RPM spec file make over.


*** Version 2.9.12 beta ***

- **READ**: The default listening PORT is NOW 8118!!! Changed from
  8000 due to conflict with NAS (Network Audio Server, whatever that
  is.)
- More CGI actions editor fixes and improvements.
- Win32 command line fix ups.
- re_filterfile now has modular sections that can be activated on a
  per site basis. Some new goodies there too.
- +filter now takes arguments to match FILTER sections in re_filterfile
  for even more flexibility.
- Added a new image blocker option: +image-blocker{pattern}, which
  displays a checkerboard patthern and scales better than the logo.
- PNG images will be used in place of GIF for JB built-in images
  if configured with --enable-no-gif.
- Clean up compiler warnings (mostly).
- Improved handling of failed DNS lookups & diagnostics for failed bind
  to listen socket
- Made --no-daemon mode log to tty instead of logfile.
- Various spec file and init script cleanups and improvements (Redhat and
  SuSE).
- CGI Editor works on OS/2 now.
- Fix restart failure where sockets were in TIME_WAIT.
- Fixes for actions cgi editor, make sure we have right file.
- A --pidfile command line option now, in addition to --help,
  --version, --no-daemon, --user and configfile. --no-daemon replaces
  the former -d option and _DEBUG define. --user will drop privileges
  to the specified user.
- Signal handling cleanups (*nix).
- CGI actions editor improvements and fixes.
- Error handling improvements, especially out of memory.
- Default re_filterfile fix that caused spurious IJB logos
  (instead of 'blank').
- configure.in threading fixes for Solaris.
- Various other minor fixes.


*** Version 2.9.11 beta Changes ***

- Add "session" cookie concept where cookies exist for the life
  of that browser session only (ie never goes to disk).
- Checks for correct header length.
- Fix user:pass@host.domain.com auth bug.
- Better signal handling on *nix.
- Fix CFLAGS hard-coded in configure.in
- Fix threading bug re: gethostbyname() that caused random
  URLs to fail in some cases.


*** Version 2.9.11 Alpha Changes ***

- A web-based editor for the actions file is included (go to http://i.j.b/).
- Web-based toggle IJB on/off support.
- Cookie handling has changed - the new +no-cookies-keep feature is now the
default.
- actionsfile is renamed to ijb.action.
- junkbstr.txt is now config.txt on Win32.
- Support for running IJB as a UNIX daemon process has improved.
- Unix daemon now returns error code on failed start.
- Timestamps in logfile and jarfile now.
- Fix for the Netscape bug reintroduced in 2.9.9.
- make should now abort if gmake (GNU make) not present.
- Many other minor bugfixes
- Start a ChangeLog :)



*** Version 2.9.3 pre-Alpha Changes ***

- Amiga support (completely untested by me - I don't have an Amiga)
- "tinygif 3" support (redirects blocked images to a specified URL, so
the browser doesn't have to load and cache many copies of the same
image).
- one case where there were both local and global "referrer" variables
(yuck!) clarified by renaming the local one to "refer".
- Fixed some places where close() was used instead of close_socket().
Thanks to Jörg Strohmayer (joergs at users.sourceforge.net) for these.
- Temporary hack to get FORCE_LOAD to work with IE.  I just lowercased the
FORCE_LOAD_PREFIX.  Needs fixing properly.
- Most URLs hardcoded into Junkbuster were changed to go through a script
e.g. http://ijbswa.sourceforge.net/redirect.php?v=2.9.3&to=faq
The only other URLs left are the GNU GPL:
  http://www.fsf.org/copyleft/gpl.html
and the home page:
  http://ijbswa.sourceforge.net/
... and various URLs which will be intercepted by Junkbuster anyway.
TODO: Still need to do something with the URLs in Junkbuster Corp's
copyright/trademark notice on the bottom of the show-proxy-args page.
- PCRE or GNU Regex is now a #define option.


*** Version 2.9.2 pre-Alpha Changes ***

- Andreas applied the latest version of the FORCE patch.


*** Version 2.9.1 pre-Alpha Changes ***

- in parsers.c, fixed two #ifdef FORCE to #ifdef FORCE_LOAD
(BTW: I think FORCE is precise enough, since loading remote
data is the whole purpose of a proxy..)
- Set the FORCE_PREFIX (back) to 'IJB-FORCE-LOAD-'. While 'noijb.'
is more elegant and looks like a hostname in the URL, it doesn't
make clear to the inexperienced user that the proxy is bypassed. It
also has a higher name collision risk.
- Filled in the function header templates for my functions in
parsers.c (again). They obviously got lost in our current
patch war ;-)
- Cut the credit for the §-referrer-option from the config file,
that Stefan had placed there.
- Improved the re_filterfile


*** Version 2.9.0 pre-Alpha Changes ***

-  Now use PCRE, not GNU REGEX.  I have not yet had chance to check the
syntax of the block/image/cookie file to ensure that they match what
is expected - however they seem to work.
-  Replaced "configure" script with one generated by "autoconf".  Also
use a header "config.h" (was ijbconfig.h in my previous release) for
the #defines.  "config.h" is now generated with "autoheader" from
"acconfig.h" and "configure.in".  (Note that to install you do not
need autoconf or autoheader - just run "./configure".)
To see command-line options, run "./configure --help".
This is my first ever autoconf script, so it has some rough edges
(how PCRE is handled is the roughest).
-  Error logging code replaced with new module errlog.c, based on the
one from JunkbusterMT (but with the threading code removed).
-  Most of Rodney's 0.21 and 0.21A patches applied. (Marked *).  I did not
apply all of these, since I had already independently done conditional
popup file, conditional image file, and integration of popup code.
- ACL, Jar and trust files conditionally compiled.
- New source file headers.
- Various cosmetic changes.  (But I have not consistently ordered the
config files - I think that's worthwhile, but it's 1am and I want to
get this released!)
- RCS tags on .h files.
-  RCS tags are const char[] rather than const char *.  (Saves 4 bytes
per tag ;-)
- VC++ project files renamed to vc_junkbuster.*.
- show-proxy-args now shows status of all conditionals, not just REGEX
- Various functions moved around.  Most notably all the system-specific
sockets code which was spread between jcc.c, bind.c, and connect.c,
has been moved to "jbsockets.c".  The non-system-specific code from
connect.c and socks4.c has been movet to "gateway.c".  Also, the
config file loader and the global variables it writes to have been
moved to "loadcfg.c".  (Maybe this should go into loaders.c?)
And candidate for the "worst filename ever" award is "miscutil.c",
which contains, well, miscellaneous utility functions like zalloc.
(Suggestions for a better name for this file are welcome!)
- Loaders now use a common function to read a line and skip comments,
and this function also stores the proxy_args.
- Added ./junkbuster --help     (Not for Win32 GUI)
- Added ./junkbuster --version  (Not for Win32 GUI)
- Win32 resources are now all marked as "U.S. English", rather than
being a mix of "U.S. English", "U.K. English" and "Irish English".
- Version number changes to 2.9.0


----------------------------------------------------------------------
Copyright   :  Written by and Copyright (C) 2001-2023 the
               Privoxy team. https://www.privoxy.org/

               Based on the Internet Junkbuster originally written
               by and Copyright (C) 1997 Anonymous Coders and
               Junkbusters Corporation.  http://www.junkbusters.com/

               This program is free software; you can redistribute it
               and/or modify it under the terms of the GNU General
               Public License as published by the Free Software
               Foundation; either version 2 of the License, or (at
               your option) any later version.

               This program is distributed in the hope that it will
               be useful, but WITHOUT ANY WARRANTY; without even the
               implied warranty of MERCHANTABILITY or FITNESS FOR A
               PARTICULAR PURPOSE.  See the GNU General Public
               License for more details.

               The GNU General Public License should be included with
               this file.  If not, you can view it at
               http://www.gnu.org/copyleft/gpl.html
               or write to the Free Software Foundation, Inc., 59
               Temple Place - Suite 330, Boston, MA  02111-1307, USA.