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| 1 消息（1字头）
▪ 100 Continue
▪ 101 Switching Protocols
▪ 102 Processing
2 成功（2字头）
▪ 200 OK
▪ 201 Created
▪ 202 Accepted
▪ 203 Non-Authoritative Information
▪ 204 No Content
▪ 205 Reset Content
▪ 206 Partial Content
▪ 207 Multi-Status
3 重定向（3字头）
▪ 300 Multiple Choices
▪ 301 Moved Permanently
▪ 302 Move temporarily
▪ 303 See Other
▪ 304 Not Modified
▪ 305 Use Proxy
▪ 306 Switch Proxy
▪ 307 Temporary Redirect
4 请求错误（4字头）
▪ 400 Bad Request
▪ 401 Unauthorized
▪ 402 Payment Required
▪ 403 Forbidden
▪ 404 Not Found
▪ 405 Method Not Allowed
▪ 406 Not Acceptable
▪ 407 Proxy Authentication Required
▪ 408 Request Timeout
▪ 409 Conflict
▪ 410 Gone
▪ 411 Length Required
▪ 412 Precondition Failed
▪ 413 Request Entity Too Large
▪ 414 Request-URI Too Long
▪ 415 Unsupported Media Type
▪ 416 Requested Range Not Satisfiable
▪ 417 Expectation Failed
▪ 422 Unprocessable Entity
▪ 423 Locked
▪ 424 Failed Dependency
▪ 425 Unordered Collection
▪ 426 Upgrade Required
▪ 449 Retry With
▪ 451Unavailable For Legal Reasons
5 服务器错误（5、6字头）
▪ 500 Internal Server Error
▪ 501 Not Implemented
▪ 502 Bad Gateway
▪ 503 Service Unavailable
▪ 504 Gateway Timeout
▪ 505 HTTP Version Not Supported
▪ 506 Variant Also Negotiates
▪ 507 Insufficient Storage
▪ 509 Bandwidth Limit Exceeded
▪ 510 Not Extended
▪ 600 Unparseable Response Headers
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