Adding HTTP Forward Proxy support in core like apache

[Mathieu CARBONNEAUX]

To replace completely apache on there major feature, while be importante to implement forward proxy feature (not has proxypass hack but also supporting connect method, and proxy authentication in nginx core .

Ok you can use nginx as forward proxy in using proxypass with variable...
​https://ef.gy/using-nginx-as-a-proxy-server

But they not support CONNECT Method natively...

And you cannot use with proxy authentification (407 vs 401 HTTP code) natively...

like :

• ​https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxyrequests
• ​https://httpd.apache.org/docs/2.4/mod/mod_proxy_connect.html

And

• ​http://stackoverflow.com/questions/7577917/how-does-a-http-proxy-utilize-the-http-protocol-a-proxy-rfc

To do that i think adding CONNECT method like ​https://github.com/chobits/ngx_http_proxy_connect_module in core...

And some modification in ​http://nginx.org/en/docs/http/ngx_http_auth_basic_module.html module to use 407 in place of 401 in response plus reading authentication in Proxy-Authorization header in place of Authorization header ...

Plus a options like proxyrequests to activate interpretation of request like:

GET http://www.baidu.com/ HTTP/1.1
Host: www.baidu.com
Proxy-Connection: keep-alive

Like proxy_pass http://$http_host$uri$is_args$args;

And interprete correctly the Proxy-Connection: keep-alive header...