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HTTP Status Codes

HTTP 406 Not Acceptable

406 Not Acceptable

The server cannot produce a response matching the list of acceptable values defined in the request's proactive content negotiation headers.

406 Not Acceptablegeneral

Observed message

406 Not Acceptable

Why it happens

  • The request sends Accept headers that the server cannot satisfy.
  • The API or server does not support the requested response format or language.
  • Content negotiation rules are too strict for the available representation.

How to fix it

  1. Review Accept, Accept-Language, and related negotiation headers in the request.
  2. Adjust the client to request a format the server actually supports.
  3. Configure the server or API to return an available representation for the resource.

Official reference

MDN: 406 Not Acceptable

Related errors

400 Bad RequestHTTP 400 Bad Request404 Not FoundHTTP 404 Not Found410 GoneHTTP 410 Gone411 Length RequiredHTTP 411 Length Required

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406 Not Acceptable: what it means and how to fix it | Error Atlas