Forward proxy frontend using OpenResty

[Anton]

Hello everybody,

I need to setup a frontend server in front of usual forward proxy (like
squid).

I tried to use Nginx for that purpose, but it can't handle such
requests, because in this case Host header is not present and hostname
is part of URL. Eg nginx expects:
GET /
Host: google.com
but browser sends:
GET http://google.com/

Is it possible to modify this Nginx behavoiur using OpenResty?

It would be great if nginx just proxy such requests without modification
of URL part.

Thank you,
Anton Habin.

[Peter Booth]

Anton,

My nginx servers are configured to add a host header if one is missing. 

This example is for a site that uses Apache, but has an nginx caching proxy in f

ront of the pool of apache servers ...

  # Common proxy settings

    proxy_set_header  X-Real-IP  $remote_addr;

    proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;

   # Return these headers back from the Apache server to the client

    proxy_pass_header Set-Cookie;

    proxy_pass_header Content-Type;

    proxy_pass_header Content-Disposition;

    proxy_pass_header Content-Length;

    proxy_http_version 1.1;

    proxy_set_header Connection "";

    proxy_redirect off;

    proxy_read_timeout 300;

    server {

        listen 80 default deferred;

        server_name www.mydomain.com origin.www.mydomain.com prodweb01.mydomain.com;

        root /home/docroot/prod;

        proxy_set_header Connection "";

        # If the host header isn't set, we set it explicitly to www.mydomain.com

        set $the_host_header $host;

        set_if_empty $the_host_header 'www.mydomain.com';

        proxy_set_header Host $the_host_header;

        access_log  /home/nginx/openresty/nginx/logs/access.log  main buffer=32k;

Hope this helps,

Peter

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