5×× Server Error

501 Not Implemented

The server does not support the functionality required to fulfill the request.

This is the appropriate response when the server does not recognize the request method and is not capable of supporting it for any resource.

A 501 response is cacheable by default; i.e., unless otherwise indicated by the method definition or explicit cache controls1.


501 Code References

Rails HTTP Status Symbol :not_implemented

Go HTTP Status Constant http.StatusNotImplemented

Symfony HTTP Status Constant Response::HTTP_NOT_IMPLEMENTED

Python2 HTTP Status Constant httplib.NOT_IMPLEMENTED

Python3+ HTTP Status Constant http.client.NOT_IMPLEMENTED

Python3.5+ HTTP Status Constant http.HTTPStatus.NOT_IMPLEMENTED

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