Error 404--Not Found From RFC 2068 Hypertext Transfer Protoc

英语翻译
Error 503--Service Unavailable
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:
10.5.4 503 Service Unavailable
The server is currently unable to handle the request due to a temporary overloading or maintenance of the server.The implication is that this is a temporary condition which will be alleviated after some delay.If known,the length of the delay may be indicated in a Retry-After header.If no Retry-After is given,the client SHOULD handle the response as it would for a 500 response.
Note:The existence of the 503 status code does not imply that a server must use it when becoming overloaded.Some servers may wish to simply refuse the connection.

下面的英文字母是什么意思
英文是 Error 404--Not Found
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:
10.4.5 404 Not Found
The server has not found anything matching the Request-URI.No indication is given of whether the condition is temporary or permanent.
If the server does not wish to make this information available to the client,the status code 403 (Forbidden) can be used instead.The 410 (Gone) status code SHOULD be used if the server knows,through some internally configurable mechanism,that an old resource is permanently unavailable and has no forwarding address.
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英语翻译
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:
10.4.5 404 Not Found
The server has not found anything matching the Request-URI.No indication is given of whether the condition is temporary or permanent.
If the server does not wish to make this information available to the client,the status code 403 (Forbidden) can be used instead.The 410 (Gone) status code SHOULD be used if the server knows,through some internally configurable mechanism,that an old resource is permanently unavailable and has no forwarding address.