HowTo: Use Auto Config Proxy PAC File For Specific Domain

by

A Proxy PAC (Proxy Auto-Configuration) file is used to configure proxy settings for a web browser. If you want to use a PAC file to configure proxy settings for a specific domain, you can use the following steps:

  1. Create a PAC file:
function FindProxyForURL(url, host) {
if (shExpMatch(host, "*.example.com")) {
return "PROXY proxy.example.com:8080";
}
return "DIRECT";
}

This PAC file will use the proxy.example.com proxy server for all URLs with a hostname that ends in .example.com. For all other URLs, it will use a direct connection (i.e., no proxy).

  1. Save the PAC file to a location accessible from your web browser. For example, you could save it to a file named proxy.pac on a web server with a URL such as http://example.com/proxy.pac.
  2. Configure your web browser to use the PAC file. The specific steps for doing this will vary depending on the web browser you are using, but here are the steps for Chrome and Firefox:
  • Chrome: Go to Settings > Advanced > System > Open proxy settings. In the Internet Properties window, go to the Connections tab, click on LAN settings, and check the Use a proxy server for your LAN checkbox. In the Address field, enter the URL of your PAC file (e.g., http://example.com/proxy.pac).
  • Firefox: Go to Options > General > Network Proxy. In the Connection Settings section, select Automatic proxy configuration URL and enter the URL of your PAC file (e.g., http://example.com/proxy.pac).
  1. Restart your web browser.

Now, when you browse to a URL with a hostname that ends in .example.com, the web browser will use the proxy.example.com proxy server for the connection. For all other URLs, it will use a direct connection.

Leave a Comment