httpstatuses/contents/codes/501.md

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---
set: 5
code: 501
title: Not Implemented
references:
"Rails HTTP Status Symbol": ":not_implemented"
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"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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---
The server does not support the functionality required to fulfill the request.
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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 controls<sup>[1](#ref-1)</sup>.
---
* <span id="ref-1"><sup>1</sup> Calculating Heuristic Freshness
[RFC7234 Section 4.2.2][2]</span>
* Source: [RFC7231 Section 6.6.2][1]
[1]: <http://tools.ietf.org/html/rfc7231#section-6.6.2>
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[2]: <http://tools.ietf.org/html/rfc7234#section-4.2.2>