HTTP 406 Not Acceptable

The server cannot produce a representation matching the request Accept headers.

Use 406 when content negotiation has no representation acceptable to the client.

httpstatus codecontent negotiation

Response (http)

HTTP/1.1 406 Not Acceptable

Use 406 when content negotiation has no representation acceptable to the client.

Common mistakes

Rejecting the request outright instead of serving a sensible default representation.

Registry reference: RFC9110, Section 15.5.7

Sources