How to force browsers to use proxy server for specific domains such as google.com or facebook.com

A generic solution to this problem is to use a custom proxy auto-configuration (PAC) file. In this file you can have arbitrary logic to select the proxy - including a white list of domains.

Here is how to do it:

• Create a text file anywhere in your local file system, e.g. C:\ProxyAutoConfiguration.js

• Paste the following content into that file

  function FindProxyForURL(url, host) {
  
      // use proxy for specific domains
      if (shExpMatch(host, "*.google.com|*.facebook.com"))
          return "PROXY yourproxy:8080";
  
      // by default use no proxy
      return "DIRECT";
  }
  

• Configure the file URL of this file (e.g. file:///C:/ProxyAutoConfiguration.js) as proxy auto-configuration script in your system or browser. In IE, this configuration is here: Internet Options > Connections > LAN settings > Use automatic configuration script.

For more information on the proxy auto-configuration file format, see for example this web page: https://findproxyforurl.com/example-pac-file/