The HyperText Transfer Protocol (HTTP)
412 Precondition Failed client error response code indicates that access to the target resource has been denied. This happens with conditional requests on methods other than
HEAD when the condition defined by the
If-None-Match headers is not fulfilled. In that case, the request, usually an upload or a modification of a resource, cannot be made and this error response is sent back.
412 Precondition Failed
|RFC 7232, section 4.2: 412 Precondition Failed||Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests|
The information below has been pulled from MDN's GitHub (https://github.com/mdn/browser-compat-data).
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
|Chrome||Edge||Firefox||Internet Explorer||Opera||Safari||Android webview||Chrome for Android||Edge Mobile||Firefox for Android||Opera for Android||iOS Safari||Samsung Internet|
|Basic support||Chrome Full support Yes||Edge Full support Yes||Firefox Full support Yes||IE Full support Yes||Opera Full support Yes||Safari Full support Yes||WebView Android Full support Yes||Chrome Android Full support Yes||Edge Mobile Full support Yes||Firefox Android Full support Yes||Opera Android Full support Yes||Safari iOS Full support Yes||Samsung Internet Android Full support Yes|
- Full support
- Full support