RFC: CPAN module for blocking open proxy requests
[ also posted to PerlMonks/Meditations ]
I have uploaded HTTP::ProxyTest to CPAN.
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.
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