◆Error Codes Wiki

HTTP 501 Not Implemented — Feature Not Supported

Warning5xx server error

Overview

HTTP 501 Not Implemented means the server does not support the functionality required to fulfill the request.

Key Details

  • Status: 501 Not Implemented
  • Category: 5xx Server Error
  • Server does not support the request method
  • Different from 405 — method is not recognized at all

Common Causes

  • Server does not recognize the HTTP method
  • Feature not yet implemented
  • New HTTP method not supported by old server
  • Proxy does not understand the request

Steps

  1. 1Use a standard HTTP method (GET, POST, PUT, DELETE)
  2. 2Check if the server supports the method you need
  3. 3Update the server software
  4. 4Try a different endpoint or approach

Tags

http-status5xx-server-errorhttp-501httpstatus-code

More in 5xx Server Error

http-500-internal-server-errorHTTP 500 Internal Server Error — What It Means & How to Fix It
Critical
http-501-not-implementedHTTP 501 Not Implemented — What It Means & How to Fix It
Critical
http-502-bad-gatewayHTTP 502 Bad Gateway — What It Means & How to Fix It
Critical
http-503-service-unavailableHTTP 503 Service Unavailable — What It Means & How to Fix It
Critical
http-504-gateway-timeoutHTTP 504 Gateway Timeout — What It Means & How to Fix It
Critical
http-505-http-version-not-supportedHTTP 505 HTTP Version Not Supported — What It Means & How to Fix It
Critical

Frequently Asked Questions

501 means method not recognized. 405 means method recognized but not allowed for this resource.