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.
|Feature||Android webview||Chrome for Android||Edge mobile||Firefox for Android||IE mobile||Opera Android||iOS Safari|