[SOLVED] How to set a fastcgi handler for a given file extension with mod_proxy

How to set a fastcgi handler for a given file extension with mod_proxy_fcgi

I have a perl fastcgi script that listens on port 2022 of localhost that I want to use as handler for any file with the extension 'stml'. What has proved to be trivial on every other webserver is apparently impossible on the over-engineered garbage that is apache2. Based on what little documentation there is on the apache site my understanding is that this would work

<FilesMatch \.stml$>
SetHandler fcgi://127.0.0.1:2022/
</FilesMatch>

And I just get this

Error: 404
proxy:fcgi://127.0.0.1:2022//path/to/my/file/index.stml not found

Have also tried SetHandler fcgi://127.0.0.1:2022 which just downloads an unhandled file with a random name like DgwDSlK.stml.

Solution

The call was coming from inside the house! That 404 was being printed by my fastcgi script in response to apache's truly brain dead (and obviously undocumented) decision to set $ENV{'SCRIPT_FILENAME'} to 'proxy:fcgi://127.0.0.1:2022/path/to/my/file/index.stml'. To make your fastcgi scripts portable between apache and non-broken web servers do something like $ENV{'SCRIPT_FILENAME'} =~ s/.*2022//; before opening it.