Which HTTP response code to send on unhandled request

Question

I have a PHP application that has a router that should have two default handlers for 401 Unauthorized and 404 Not Found.

But it could happen that no handlers were set for those two cases. In that case, I need to have a default response that tells Request Unhandled, I have set it to the response code 400 Bad Request, but I feel like its not truly appropriate.

What response code should I use for a unhandled request?

4xx is generally a client's problem. 5xx is your problem. So if you cannot handle a request - it is HTTP 5xx. For example - `501 Not Implemented` — zerkms, Sep 01 '16 at 23:41

score 5 · Accepted Answer · answered Sep 01 '16 at 23:44

4xx is generally a client's problem. 5xx is your (server-side) problem. So if you cannot handle a request - it is HTTP 5xx.

In this case it looks that 501 Not Implemented is the best fit.

References:

Which HTTP response code to send on unhandled request

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