Unconditional compilation of the postpone filter. Postpone filter is an essential part of subrequest functionality. In absence of it a subrequest response body is sent to the client out of order with respect to the main request header and body, as well as other subrequests. For in-memory subrequests the response is also sent to the client instead of being stored in memory. Currently the postpone filter is automatically enabled if one of the following standard modules which are known to create subrequests is enabled: ssi, slice, addition. However a third-party module that creates subrequests can still be built without the postpone filter or be dynamically loaded in nginx built without it.

scgi_param  REQUEST_METHOD     $request_method;
scgi_param  REQUEST_URI        $request_uri;
scgi_param  QUERY_STRING       $query_string;
scgi_param  CONTENT_TYPE       $content_type;

scgi_param  DOCUMENT_URI       $document_uri;
scgi_param  DOCUMENT_ROOT      $document_root;
scgi_param  SCGI               1;
scgi_param  SERVER_PROTOCOL    $server_protocol;
scgi_param  REQUEST_SCHEME     $scheme;
scgi_param  HTTPS              $https if_not_empty;

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