Dont know why, but my apache server does not want to use the error 404 html file im giving it, or the link to that file, or even a normal error string...
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Managed to finally fix it!
So apparently the arch installation of #apache2 comes with a "multilang-error" config file, which redefines all the possible error codes and is INCLUDED BY DEFAULT!
Abyway, removing it(commenting the include line) made my file to take effect so now my website has an actual 404 error page
