[ also posted to comp.lang.perl.modules and comp.lang.perl.misc ]

I have uploaded HTTP::ProxyTest to CPAN. From README:

Robots that send comment spam are often hidden behind anonymous open proxy servers. You can use HTTP::ProxyTest to look for open proxies on-the-fly and prevent such spam robots from submitting their crap. The module is particularly useful if you don't want to bother your web site visitors with CAPTCHAs etc.
HTTP::ProxyTest tests certain ports of REMOTE_ADDR that are often used for anonymous open proxies, and denies access if an open proxy is found, i.e. it responds with status "403 Forbidden" and exits.

I have been using that approach to fighting comment spam for more than a year, and it has proved to work well.

Your comments on both the usefulness of HTTP::ProxyTest and the code would be much welcome. Since the module source is conveniently available at CPAN, I did not post it here.

In reply to RFC: CPAN module for blocking open proxy requests by Gunnar

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