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HTTP 510 Not Extended — What It Means & How to Fix It

Critical5xx server error

Overview

The HTTP 510 Not Extended status code indicates the server requires further extensions to the request in order to fulfill it.

Key Details

  • This status code is defined in RFC 2774 for HTTP Extension Framework.
  • The client must send a request with the required extensions.
  • The response should specify what extensions are needed.
  • It is extremely rare in practice.

Common Causes

  • The server requires additional HTTP extensions not present in the request.
  • A mandatory extension header is missing from the request.
  • The server policy requires specific extensions for the requested operation.

Steps

  1. 1Check the response for information about required extensions.
  2. 2Add the necessary extension headers to your request.
  3. 3Review the server documentation for required extensions.
  4. 4Contact the server administrator for details on required extensions.

Tags

httpserver-errorextensionnot-extended

Related Items

http-500-internal-server-errorhttp-501-not-implementedhttp-502-bad-gatewayhttp-503-service-unavailablehttp-504-gateway-timeout

More in 5xx Server Error

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

It means the server needs additional HTTP extensions in the request to fulfill it. The response should specify what extensions are required.