Throw HTTP 501 instead of 404 when request not supported #3075
Description
Is your feature request related to a problem? Please describe.
I noticed Android client requesting PDF preview which was not supported, leading to 404 error in web server log. This caused fail2ban to block the client. Wouldn't throwing a 501 Not Implemented be more sensible?
Describe the solution you'd like
No response
Describe alternatives you've considered
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Additional context
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