HTTP HTTP POST client-body-tagger HTTP/1.1 200 OK Connection: close Content-Type: text/html X-Connection: swsclose Received your input. http Two requests to the same URL. The second one is large and blocked based on a tag applied with the client-body-tagger{blafasel}. proxy -s --write-out '%{stderr}%{response_code}\n' http://%HOSTIP:%HTTPPORT/%TESTNUMBER --next -d "blafasel%repeat[5000 x padding]%" -s --write-out '%{stderr}%{response_code}\n' http://%HOSTIP:%HTTPPORT/%TESTNUMBER GET /%TESTNUMBER HTTP/1.1 Host: %HOSTIP:%HTTPPORT User-Agent: curl/%VERSION Accept: */* Connection: close 200 403