Some (minor) spoilers follow. I don't have time to parse through the whole thing right now, but if anyone has the urge to, that would be great.

The entire "Content-type" string is a sort of red herring and is never printed out, although the script does create an html file. Basically use it like this:

obfuscindex.pl > foo.html
[download]

and then take a look at the foo.html file in your favorite browser. Most of the script is spent getting a string ready to pass into the eval near the end. Then the rest of the script munges the output of the eval a bit, and outputs it. This was for the Obfuscated Perl Contest category 2: "World Wide Wasteland". The object was to create a truly horrific web page. Keeping it under 512 characters was definitely the hardest part, but it was a nice challenge. The result is certainly a very ugly, if oddly familiar, web page. Will not work on a Solaris box (hint hint).