Overview

You're asking the wrong server.

Takeaways

  1. The request was directed at a server that is not able to produce a response.
  2. 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.
  3. 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.
  4. This is possible if a connection is reused or if an alternative service is selected.

Information

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 controls.

Further Reading

Specification

421 Misdirected Request | The HTTP Working Group

421 Misdirected Request

MDN web docs