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[378267] Skip DNS rebinding checks if HTTP_PROXY present

Rostyslav Safonov requested to merge rs-378267-skip-rebinding-when-http-proxy-set-2 into master

What does this MR do and why?

Implementation for Skip DNS rebinding protection when HTTP_PROXY environment is set.

Screenshots or screen recordings

How to set up and validate locally

  • Set up forward proxy locally. I used nginx docker image for that purpose and set it up on 8888 port.
  • Change lib/gitlab/github_import/client.rb api_endpoint, web_endpoint methods to http://api.github.com and http://github.com. Or probably you could change the github omniauth site value to an http (not https endpoint) if your proxy doesn't support https as my own.
  • Turn off your/proxy internet connection. It's the most simple method to fail host resolving process.
My nginx proxy config 
server {

    listen 8888;

    location / {
        resolver 8.8.8.8;

        proxy_pass https://$http_host$uri$is_args$args;
        proxy_pass_request_headers on;
        proxy_pass_request_body on;
        proxy_read_timeout 2s;
    }

}

MR acceptance checklist

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