https://mailman.nginx.org/pipermail/nginx/2017-July/054219.html
set_real_ip_from, real_ip_header directive in ngx_http_realip_module
setrealipheader
https://nginx.org/en/docs/stream/ngx_stream_realip_module.html
Module ngx_stream_realip_module
modulengxstream
https://mailman.nginx.org/pipermail/nginx/2015-September/048685.html
realip and remote_port
remoteport