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    在 HTTP 协议中，响应状态码 412 Precondition Failed（先决条件失败）表示客户端错误，意味着对于目标资源的访问请求被拒绝。这通常发生于采用除 GET 和 HEAD 之外的方法进行条件请求时，由首部字段 If-Unmodified-Since 或 If-None-Match 规定的先决条件不成立的情况下。这时候，请求的操作——通常是上传或修改文件——无法执行，从而返回该错误状态码。

    状态码

    1. 412 Precondition Failed（先决条件失败）

    规范

    SpecificationTitle
    RFC 7232, section 4.2: 412 Precondition FailedHypertext Transfer Protocol (HTTP/1.1): Conditional Requests

    浏览器兼容性

    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.

    Update compatibility data on GitHub

    DesktopMobile
    ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
    412ChromeFull support YesEdgeFull support YesFirefoxFull support YesIEFull support YesOperaFull support YesSafariFull support YesWebView AndroidFull support YesChrome AndroidFull support YesEdge MobileFull support YesFirefox AndroidFull support YesOpera AndroidFull support YesSafari iOSFull support YesSamsung Internet AndroidFull support Yes

    Legend

    • Full support
    • Full support

    参见

    • 304
    • If-Unmodified-Since
    • If-None-Match
    • 428

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    • 错误状态码

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