Mystery... Faked Referrer Generates 500 Instead of 404 Error

Hello. I hope someone can provide some clues.I have begun receiving
regular 500 errors from a page that does not exist. Without providing
the entire error page, here are the essentials:

[Django] ERROR (EXTERNAL IP): Internal Server Error: /sample/
path/calendar.pl

IOError: request data read error

'HTTP_REFERER': 'http://mydomain.org/calendar.pl',
'PATH_INFO': u'/sample/path/calendar.pl',

If I visit the page http://mydomain.org/calendar.pl, I get a 404
error, but the error message referencing the same page generates an
internal server (500) error.

QUESTIONS:
Should I be concerned?
Why do I get a 500 error instead of 404 error?
Any suggestions for troubleshooting?

This has been driving me nuts for a few days. Any help is very
appreciated.

Thanks

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