421 Misdirected Request
The request was directed to a server that is not able to produce a response for the requested resource.
Use Cases
- null
How does 421 Misdirected Request affect Search Engine Optimization (SEO)?
How does Google treat Client Error 4xx HTTP response status codes?
Google's indexing pipeline doesn't consider URLs that return a 4xx status code for indexing, and URLs that are already indexed and return a 4xx status code are removed from the index. Any content Googlebot received from URLs that return a 4xx status code is ignored.
Information from Internet Standards from IEFT
The 421 (Misdirected Request) status code indicates that the request was directed at a server that is unable or unwilling to produce an authoritative response for the target URI. An origin server (or gateway acting on behalf of the origin server) sends 421 to reject a target URI that does not match an origin for which the server has been configured (Section 4.3.1) or does not match the connection context over which the request was received (Section 7.4). A client that receives a 421 (Misdirected Request) response MAY retry the request, whether or not the request method is idempotent, over a different connection, such as a fresh connection specific to the target resource's origin, or via an alternative service [ALTSVC]. A proxy MUST NOT generate a 421 response.
Source: 421 Misdirected Request