log_format xxx 'remote_addr=[$remote_addr] http_x_forward=[$http_x_forwarded_for] time=[$time_local] request=[$request] '
'status=[$status] byte=[$bytes_sent] elapsed=[$request_time] upstream_connect_time=[$upstream_connect_time] upstream_response_time=[$upstream_response_time] '
'refer=[$http_referer] body=[$request_body] ua=[$http_user_agent] cookie=[$http_cookie] gzip=[$gzip_ratio] '
'msec=[$msec] http_host=[$http_host] http_accept=[$http_accept|$http_accept_encoding|$http_accept_language] '
'sent_http_set_cookie=[$sent_http_set_cookie]';