... instead of the command line (two more tests affected).
 # Sending the first request to appease the test framework.
 # We mainly care about the second request which is too large for Privoxy to buffer it.
 <command>
---insecure https://%HOSTIP:%HTTPSPORT/first-request/%TESTNUMBER --next -d "blafasel%repeat[20000 x padding]%" --insecure https://%HOSTIP:%HTTPSPORT/second-request/%TESTNUMBER
+--insecure https://%HOSTIP:%HTTPSPORT/first-request/%TESTNUMBER --next -d @log/post-data-%TESTNUMBER --insecure https://%HOSTIP:%HTTPSPORT/second-request/%TESTNUMBER
 </command>
+<file name="log/post-data-%TESTNUMBER">
+blafasel%repeat[20000 x padding]%
+</file>
 </client>
 
 <verify>
 
 </features>
 # We mainly care about the second request which is too large for Privoxy to buffer it.
 <command>
---insecure https://%HOSTIP:%HTTPSPORT/first-request/%TESTNUMBER --next -d "blafasel%repeat[20000 x padding]%" --insecure https://%HOSTIP:%HTTPSPORT/second-request/%TESTNUMBER
+--insecure https://%HOSTIP:%HTTPSPORT/first-request/%TESTNUMBER --next -d @log/post-data-%TESTNUMBER --insecure https://%HOSTIP:%HTTPSPORT/second-request/%TESTNUMBER
 </command>
+<file name="log/post-data-%TESTNUMBER">
+blafasel%repeat[20000 x padding]%
+</file>
 </client>
 
 <verify>