Please post (at least critical parts of) your code, otherwise it is very hard to analyze what is happening.

But the real advice I am going to give is do not parse your POSTS (or anything else CGI) by yourself, use CGI.pm instead, and it *will* work. Other than as an interesting exercise to learn more about the inner workings of the HTTP and CGI protocols, you should never do this on your own. Your own wheel will very unlikely be as round, neat and well pumped as CGI.pm. :)

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You have moved into a dark place.
It is pitch black. You are likely to be eaten by a grue.