4×× - Client Error

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 reused¹or 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.

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• ¹ Connection Reuse RFC7540 Section 9.1.1
• ² Calculating Heuristic Freshness RFC7234 Section 4.2.2
• Source: RFC7540 Section 9.1.2

421 Code References

• Rails HTTP Status Symbol: :misdirected_request