HowTo: Test a Proxy PAC File Syntax With Syntax Checker

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A Proxy PAC (Proxy Auto-Configuration) file is used to configure proxy settings for a web browser. The file specifies the rules for determining which proxy server(s) to use for which URL(s).

To test the syntax of a Proxy PAC file, you can use a PAC file syntax checker, such as the one provided by Firefox. Here’s how to use it:

  1. Open Firefox and go to the about:config page.
  2. In the search bar, type network.proxy.autoconfig_url.
  3. Double-click on the network.proxy.autoconfig_url preference and enter the URL of your PAC file in the pop-up window.
  4. Restart Firefox and go to the about:proxy page.
  5. The syntax of your PAC file will be checked, and any errors or warnings will be displayed on the about:proxy page.

You can also test the syntax of your PAC file using a PAC file validator tool, such as the one available at https://pacvalidator.appspot.com/. Simply upload your PAC file and the tool will check its syntax and report any errors or warnings.

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