proxy.conf

    server {
        listen                         8081;

         # dns resolver used by forward proxying
         resolver                       114.114.114.114;
         # forward proxy for CONNECT request
         proxy_connect;
         proxy_connect_allow            443;
         proxy_connect_connect_timeout  10s;
         proxy_connect_read_timeout     10s;
         proxy_connect_send_timeout     10s;
        set_by_lua_file $rhost /usr/local/openresty/nginx/lua/set_by.lua;
                proxy_cache off;
                expires off;
         # forward proxy for non-CONNECT request
         location / {
                proxy_cache_valid 200 302 10m;
                proxy_cache_valid 301 1h;
                proxy_cache_valid any 1m;
             proxy_pass http://$rhost;
             proxy_set_header Host $host;

         }
    }