Not Acceptable

Client Error

The requested resource is capable of generating only content not acceptable according to Accept headers

Server can't produce response matching client's Accept headers

How this status code appears in HTTP responses

HTTP Response Header

HTTP/1.1 406 Not Acceptable

cURL Example

curl -I https://example.com
# Returns: HTTP/1.1 406 Not Acceptable

This is a client error response indicating the request contains bad syntax or cannot be fulfilled.

Other codes in the same category

The server cannot process the request due to client error

Authentication is required and has failed or has not been provided

Reserved for future use in digital payment systems