HTTP 421 — Misdirected Request
The request was directed at a server that is not able to produce a response
When to use it
Use status 421 when this is the correct HTTP response semantic: The request was directed at a server that is not able to produce a response
Request and response example
GET /protected-resource HTTP/1.1
Host: api.example.com
HTTP/1.1 421 Misdirected Request
Content-Type: application/json
{"error":"Request cannot be completed"}