421 Misdirected Request

The request was directed at a server that is not able to produce a response. This can be sent by a server that is not configured to produce responses for the combination of scheme and authority that are included in the request URI.

Clients receiving a 421 Misdirected Request response from a server MAY retry the request -- whether the request method is idempotent or not -- over a different connection. This is possible if a connection is reused¹ or if an alternative service is selected ALT-SVC.

This status code MUST NOT be generated by proxies.

A 421 response is cacheable by default, i.e., unless otherwise indicated by the method definition or explicit cache controls².

¹ Connection Reuse RFC7540 Section 9.1.1
¹ Calculating Heuristic Freshness RFC7234 Section 4.2.2
Source: RFC7540 Section 9.1.2

421 Code references

Go HTTP Status Constant http.StatusMisdirectedRequest
Python3+ HTTP Status Constant http.client.MISDIRECTED_REQUEST
Python3.5+ HTTP Status Constant http.HTTPStatus.MISDIRECTED_REQUEST
Rails HTTP Status Symbol :misdirected_request
Symfony HTTP Status Constant Response::HTTP_MISDIRECTED_REQUEST

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