if you're using a real web server like apache, then you should look into mod_rewrite or mod_redirect (which are Apache modules and have essentially nothing to do with Perl). The latter is easier to use but less flexible. They will allow to spoof the URL to whatever you want and return a file. You could send all requests through a CGI, but I see that as wasteful and recreating what the web server was supposed to do in the first place.

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