4xx Client ErrorHTTP Status Code Reference
HTTP 421 Misdirected Request— What It Means, Causes & How to Fix It
The request was directed at a server that is not able to produce a response. This can happen when a server is not configured for the combination of scheme and authority included in the request URI.
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Common Causes
- HTTP/2 connection coalescing to the wrong server
- TLS certificate doesn't match the requested hostname
- Server not configured for the requested domain
How to Fix
- 1Verify the server's TLS certificate covers the requested domain
- 2Ensure DNS is pointing to the correct server
- 3Check HTTP/2 connection reuse settings
Example
HTTP 421 Misdirected Request
GET https://other-domain.com/page HTTP/2 (sent over reused connection to wrong server) → 421 Misdirected Request
Related Client Error Codes
400
Bad Request
401Unauthorized
402Payment Required
403Forbidden
404Not Found
405Method Not Allowed
406Not Acceptable
407Proxy Authentication Required
408Request Timeout
409Conflict
410Gone
411Length Required
412Precondition Failed
413Content Too Large
414URI Too Long
415Unsupported Media Type
416Range Not Satisfiable
417Expectation Failed
418I'm a Teapot
422Unprocessable Content
423Locked
424Failed Dependency
425Too Early
426Upgrade Required
428Precondition Required
429Too Many Requests
431Request Header Fields Too Large
451Unavailable For Legal Reasons
Commonly Referenced Status Codes
The most frequently searched HTTP status codes