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HTTP in depth

https://developer.mozilla.org/en-US/docs/Web/HTTP

https://developer.mozilla.org/en-US/docs/Web/HTTP/Status

HTTP response status codes

Responses are grouped in five classes:

1. Informational responses (100–199)
2. Successful responses (200–299)
3. Redirects (300–399)
4. Client errors (400–499)
5. Server errors (500–599)

常见 HTTP 状态吗

1xx?

200

301
302
304 重定向

403
404 请求的方法不存在
405 请求的方法不允许

500 服务端错误
502
504

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