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406 Not Acceptable

The HyperText Transfer Protocol (HTTP) 406 Not Acceptable client error response code indicates that the server cannot produce a response matching the list of acceptable values defined in the request's proactive content negotiation headers, and that the server is unwilling to supply a default representation.

Proactive content negotiation headers include:

In practice, this error is very rarely used. Instead of responding using this error code, which would be cryptic for the end user and difficult to fix, servers ignore the relevant header and serve an actual page to the user. It is assumed that even if the user won't be completely happy, they will prefer this to an error code.

If a server returns such an error status, the body of the message should contain the list of the available representations of the resources, allowing the user to choose among them.

Status

406 Not Acceptable

Specifications

Specification Title
RFC 7231, section 6.5.6: 406 Not Acceptable Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content

Browser compatibilityUpdate compatibility data on GitHub

The information shown below has been pulled from MDN's GitHub (https://github.com/mdn/browser-compat-data).

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
406 Yes 12 Yes Yes Yes Yes
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
406 Yes Yes Yes Yes Yes Yes

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/406