Apache Proxy : HTTP Error 502 Bad gateway problem

Description

Around 2-4 times a day, mod_proxy will close the connection and return a HTTP/Bad_Gateway.

For circumstances where mod_proxy is sending requests to an origin server that doesn't properly implement keepalives or HTTP/1.1, there are two environment variables that can force the request to use HTTP/1.0 with no keepalive. These are set via the SetEnv directive.

These are the force-proxy-request-1.0 and proxy-nokeepalive notes.

 
   ProxyPass http://buggyappserver:7001/foo/  
   SetEnv force-proxy-request-1.0 1  
   SetEnv proxy-nokeepalive 1  
 

References

https://issues.apache.org/bugzilla/show_bug.cgi?id=48315

http://httpd.apache.org/docs/2.2/mod/mod_proxy.html