Nginx log format

log_format_nginx.conf

log_format detailed '$remote_addr $remote_user [$time_iso8601] '
                    '"$request" $status $body_bytes_sent '
                    '"$http_referer" "$http_user_agent" '
                    '$request_time $request_length $pipe $msec '
                    '$connection_requests $connection $bytes_sent '
                    '$content_length "$content_type" "$host" '
                    '$tcpinfo_rtt $tcpinfo_rttvar $tcpinfo_snd_cwnd $tcpinfo_rcv_space';