404 Not Found

状态码 404 Not Found 代表客户端错误，指的是服务器端无法找到所请求的资源。返回该响应的链接通常称为坏链（broken link）或死链（dead link），它们会导向链接出错处理(link rot)页面。

404 状态码并不能说明请求的资源是临时还是永久丢失。如果服务器知道该资源是永久丢失，那么应该返回 410 (Gone) 而不是 404 。

状态

404 Not Found

自定义错误页面

许多网站会将 404 页面的外观进行定制，使其对用户更友好，以及提供一些引导。例如，Apache 服务器可以在 .htaccess 文件中进行配置，代码片段如下：

ErrorDocument 404 /notfound.html

你可以访问一下 MDN 的 404 页面获取一些启发。

自定义的404页面应该是对用户友好且可读性高的，不能使用户产生困惑。

规范

Specification Title
RFC 7231, section 6.5.4: 404 Not Found Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
404Chrome Full support YesEdge Full support 12Firefox Full support YesIE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes

Legend

Full support  
Full support

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