HTTP 501 Not Implemented
5xx – Server error
| Status code | 501 |
|---|---|
| Reason phrase | Not Implemented |
| Class | 5xx – Server error |
| Reference | RFC 9110 |
Frequently asked questions
What does HTTP status 501 mean?
The server does not support the requested functionality or method.
Is 501 an error?
Yes, a server error (5xx): the request was probably fine, but the server failed to fulfil it.
Where is HTTP 501 defined?
Status code 501 is specified in RFC 9110.