HTTP 501 Not Implemented 服务器错误响应码表示请求的方法不被服务器支持，因此无法被处理。服务器必须支持的方法（即不会返回这个状态码的方法）只有 GET 和 HEAD。
请注意，你无法修复 501 错误，需要被访问的 web 服务器去修复该问题。
501 响应默认是可缓存的。
状态
501 Not Implemented
Specifications
| Specification | Title |
|---|---|
| RFC 7231, section 6.6.2: 501 Not Implemented | Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content |
Browser compatibility
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 | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | Servo |
|---|---|---|---|---|---|---|---|
| Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Android | Chrome for Android | Edge Mobile | Firefox for Android | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |