[FR]: Proxy setup via proxyconfig files

[uriesk]

Brief description of the feature request

Allow to use proxy configuration URLs aka .pac files. Browsers have that setting too.

They are very handy and underrated. i.e. you can specify that only .onion domains should be accessed via running Tor socks proxy. And there are blogs and news websites running on .onion domains

[martinrotter]

Give link to some "proxyconfig" file examples.

[uriesk]

sure,

function FindProxyForURL(url, host) { 
  if (dnsDomainIs(host, ".onion")) {
      return "SOCKS 127.0.0.1:9050";
  }
  return "DIRECT"; 
}

This would route all onion domains over Tor, while the rest connects directly without proxy. In Firefox, it works by setting it as autoconfig url in the proxy settings (with file:/// when it's local). In Chromium browsers via launch argument:

--proxy-pac-url='data:application/x-javascript-config;base64,'$(base64 -w0 ~/.config/proxyconfig.pac)

And here the MDN page about it: https://developer.mozilla.org/en-US/docs/Web/HTTP/Proxy_servers_and_tunneling/Proxy_Auto-Configuration_PAC_file

[martinrotter]

https://ivandemarino.me/2011/03/21/How-to-handle-Proxy-PAC-configuration-with-Qt https://github.com/richmoore/qt-examples/blob/master/pac-files/proxyautoconfig.cpp