Upstream: fixed store/cache of unfinished responses. In case of upstream eof, only responses with u->pipe->length == -1 are now cached/stored. This ensures that unfinished chunked responses are not cached. Note well - previously used checks for u->headers_in.content_length_n are preserved. This provides an additional level of protection if protol data disagree with Content-Length header provided (e.g., a FastCGI response is sent with wrong Content-Length, or an incomple SCGI or uwsgi response), as well as protects from storing of responses to HEAD requests. This should be reconsidered if we'll consider caching of responses to HEAD requests.

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

uwsgi_param  REQUEST_URI        $request_uri;
uwsgi_param  PATH_INFO          $document_uri;
uwsgi_param  DOCUMENT_ROOT      $document_root;
uwsgi_param  SERVER_PROTOCOL    $server_protocol;
uwsgi_param  HTTPS              $https if_not_empty;

uwsgi_param  REMOTE_ADDR        $remote_addr;
uwsgi_param  REMOTE_PORT        $remote_port;
uwsgi_param  SERVER_PORT        $server_port;
uwsgi_param  SERVER_NAME        $server_name;