pactester(1) Tool to test proxy auto-config (pac) files.


pactester <-p pacfile> <-u url> [-h host] [-c client_ip] [-e]

pactester <-p pacfile> <-f urlslist> [-c client_ip] [-e]


pactester is a tool to test proxy auto-config (pac) files. It returns the proxy config string for the given URL and the pac file. pactester uses pacparser C library for most of its functionality.


-p pacfile
PAC file to test. Specify "-" to read from the standard input.
-u url
URL to test the PAC file for.
-h host
Host part of the URL. If not specified, it's determined from the URL.
-c client_ip
Client's IP address (as returned by the function myIpAddress() in PAC files). If not specified, it defaults to the IP address of the machine on which this tool is running.
Enable Microsoft PAC extensions (dnsResolveEx, myIpAddressEx, isResolvableEx).
-f urlslist
A file containing the list of URLs to be tested. This is good for testing a PAC file against a set of URLs.


To find out the proxy config string for the pac file "wpad.dat" and the URL "":

$ pactester -p wpad.dat -u

For a client with IP address

$ pactester -p wpad.dat -c -u

For a pac file hosted at http://wpad/wpad.dat:

$ curl -s http://wpad/wpad.dat | pactester -p - -u


If you have come across a bug in pactester, please submit a bug report at


Written by Manu Garg (