All HTTP status codes

HTTP 406 Not Acceptable

Client Error

The server can't produce a response matching the client's Accept headers (content type, language, encoding).

Defined in RFC 9110

Common causes

  • Accept header demands a representation the server doesn't offer

How to fix it

  1. Loosen the Accept header (e.g. application/json, */*)

  2. On the server, support the formats clients realistically request

Related status codes

415 Unsupported Media Type

The server refuses the request because the body's media type (Content-Type/Content-Encoding) isn't supported by the endpoint.

300 Multiple Choices

More than one representation of the resource exists and the client should pick one. Rarely used — most servers pick a representation themselves.

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