socks-nginx-module

Sample usage:

location / {
  socks_set_header Host $http_host;
  socks_set_header Proxy-Connection '';
  socks_pass_header Server;
  socks_redirect off;
  socks_http_version 1.1;
  socks_tunnel_header X-Connect;
  socks_buffers 16 16k; 
  socks_buffer_size 32k;
  socks_cache proxy;
  socks_cache_valid 30s;
  socks_cache_use_stale error timeout invalid_header updating
                        http_500 http_502 http_503 http_504;
  socks_pass socks5://127.0.0.1:1080;
}

All ngx_http_proxy_module directives are supported.

##socks_tunnel_header

As nginx HTTP parser doesn't support HTTP CONNECT method, a special header can be set to indicate tunnel connection.

This directive can be exploited with the following HAProxy configuration:

frontend local
  bind *:8080
  mode http
  http-request set-method GET if METH_CONNECT
  http-request set-uri https://%[req.hdr(Host)]/ if METH_CONNECT
  http-request add-header X-Connect true if METH_CONNECT
  default_backend nginx

backend nginx
  mode http
  server proxy 127.0.0.1:8080 maxconn 100000