Upstream: fixed cache corruption and socket leaks with aio_write. The ngx_event_pipe() function wasn't called on write events with wev->delayed set. As a result, threaded writing results weren't properly collected in ngx_event_pipe_write_to_downstream() when a write event was triggered for a completed write. Further, this wasn't detected, as p->aio was reset by a thread completion handler, and results were later collected in ngx_event_pipe_read_upstream() instead of scheduling a new write of additional data. If this happened on the last reading from an upstream, last part of the response was never written to the cache file. Similar problems might also happen in case of timeouts when writing to client, as this also results in ngx_event_pipe() not being called on write events. In this scenario socket leaks were observed. Fix is to check if p->writing is set in ngx_event_pipe_read_upstream(), and therefore collect results of previous write operations in case of read events as well, similar to how we do so in ngx_event_pipe_write_downstream(). This is enough to fix the wev->delayed case. Additionally, we now call ngx_event_pipe() from ngx_http_upstream_process_request() if there are uncollected write operations (p->writing and !p->aio). This also fixes the wev->timedout case.

fastcgi_param  QUERY_STRING       $query_string;
fastcgi_param  REQUEST_METHOD     $request_method;
fastcgi_param  CONTENT_TYPE       $content_type;
fastcgi_param  CONTENT_LENGTH     $content_length;

fastcgi_param  SCRIPT_NAME        $fastcgi_script_name;
fastcgi_param  REQUEST_URI        $request_uri;
fastcgi_param  DOCUMENT_URI       $document_uri;
fastcgi_param  DOCUMENT_ROOT      $document_root;
fastcgi_param  SERVER_PROTOCOL    $server_protocol;
fastcgi_param  REQUEST_SCHEME     $scheme;
fastcgi_param  HTTPS              $https if_not_empty;

fastcgi_param  GATEWAY_INTERFACE  CGI/1.1;
fastcgi_param  SERVER_SOFTWARE    nginx/$nginx_version;

fastcgi_param  REMOTE_ADDR        $remote_addr;
fastcgi_param  REMOTE_PORT        $remote_port;
fastcgi_param  SERVER_ADDR        $server_addr;
fastcgi_param  SERVER_PORT        $server_port;
fastcgi_param  SERVER_NAME        $server_name;

# PHP only, required if PHP was built with --enable-force-cgi-redirect
fastcgi_param  REDIRECT_STATUS    200;