1、500 Internal Server Error：服務器遇到了不知道如何處理的情況。
1. 500 Internal Server Error: the server encountered a situation that it did not know how to handle.
2、501 Not Implemented：此請求方法不被服務器支持且無法被處理。只有GET和HEAD是要求服務器支持的，它們必定不會返回此錯誤代碼。
2. 501 not implemented: this request method is not supported by the server and cannot be processed. Only get and head are supported by the server, and they must not return this error code.
3、502 Bad Gateway：此錯誤響應表明服務器作為網關需要得到一個處理這個請求的響應，但是得到一個錯誤的響應。
3. 502 bad gateway: this error response indicates that the server as a gateway needs to get a response to handle this request, but it gets an error response.
4、503 Service Unavailable：服務器沒有準備好處理請求。 常見原因是服務器因維護或重載而停機。
4. 503 service unavailable: the server is not ready to process requests. Common causes are server downtime due to maintenance or heavy load.
6、504 Gateway Timeout：當服務器作為網關，不能及時得到響應時返回此錯誤代碼。
6. 504 gateway timeout: this error code is returned when the server, as a gateway, cannot receive a response in time.
7、505 HTTP Version Not Supported：服務器不支持請求中所使用的HTTP協議版本。
7. 505 HTTP version not supported: the server does not support the HTTP protocol version used in the request.
8、506 Variant Also Negotiates：服務器有一個內部配置錯誤：對請求的透明內容協商導致循環引用。
8. 506 variant also negotiations: the server has an internal configuration error: transparent content negotiation on the request leads to circular reference.
9、507 Insufficient Storage：服務器有內部配置錯誤：所選的變體資源被配置為參與透明內容協商本身，因此不是協商過程中的適當端點。
9. 507 insufficient storage: the server has an internal configuration error: the selected variant resource is configured to participate in the transparent content negotiation itself, so it is not the appropriate endpoint in the negotiation process.
10、508 Loop Detected (WebDAV (en-US))：服務器在處理請求時檢測到無限循環。
10. 508 loop detected (WebDAV (EN US)): the server detected an infinite loop while processing the request.
11、510 Not Extended：客戶端需要對請求進一步擴展，服務器才能實現它。服務器會回復客戶端發出擴展請求所需的所有信息。
11. 510 not extended: the client needs to further extend the request before the server can implement it. The server replies to all the information the client needs to make an extension request.
12、511 Network Authentication Required：511 狀態碼指示客戶端需要進行身份驗證才能獲得網絡訪問權限
12. 511 network authentication required: the 511 status code indicates that the client needs authentication to obtain network access
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