HTTP 421 (Misdirected Request): meaning and handling

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: HTTP 421 means the server or connection cannot produce a response for the requested origin.

Could be also:
Constant	Type	OS
USB_DRIPS_BLOCKER_SURPRISE_REMOVAL_LIVEDUMP	BugCheck Code	Windows

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HTTP_STATUS_ENHENCE_CALM	HTTP_STATUS_UNPROCESSABLE_ENTITY

HTTP_STATUS_MISDIRECTED_REQUEST

This status is especially relevant to reused HTTP/2 or HTTP/3 connections: a server may receive a request for an authority it is not configured to serve on that connection.

Clients can retry on a new connection to the target origin. Server operators should check TLS certificate coverage, virtual-host configuration, authority headers, and connection coalescing behavior.

This can occur when a reused or coalesced connection reaches a server that cannot serve the authority named by the request, even though the connection itself is valid. Clients can retry the request on a separate connection for the correct origin. Servers and proxies should also verify virtual-host and connection-coalescing configuration.

RFC 9110: HTTP Semantics

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