501Not Implemented

The server does not support the functionality needed to answer this request at all.

When you see it

A method the server does not recognise, or a feature that exists in the specification but not in this server. Unlike 405, which means the method is understood but not allowed here, 501 means the server does not implement it anywhere.

Often confused with

405 Method Not Allowed

405 means the server knows the method but this URL does not accept it. 501 means the server does not support the method at all, on any URL.

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Status codes

69 of 69 codes. Click a row to copy it.

1xx Informational (4)

2xx Success (10)

3xx Redirection (8)

4xx Client errors (31)

5xx Server errors (16)