Projects / pactester


Pactester is a tool to test proxy auto-configuration (PAC) files. PAC files are used by browsers to identify the correct proxy server for a given URL. Since the PAC file evaluation mechanism is generated inside the browser and cannot be accessed from outside, the only way to tell which proxy your browser will use for a specific URL is manual inspection of the PAC file. Unfortunately, this approach is error prone and quickly becomes impractical for large and complex PAC files. Pactester resolves this issue by simulating browser behavior.

Operating Systems

Recent releases

  •  06 May 2008 15:37

    Release Notes: This release fixes pactester's ability to guess the hostname for URLs that include port numbers in the hostname part (for example, In older versions, this bug can be avoided by specifying the hostname on the command line (with the -h option).

    •  12 Apr 2008 08:11

      Release Notes: A new option was added for specifying client IP address (as returned by myIpAddress).


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