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问题描述：

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.

问题解答：

错误503 -服务不可用
来自符合RFC 2068超文本传输协议- HTTP/1.1 ：
10.3.11 503服务不可用
服务器目前无法处理此要求，由于暂时性的超载或维修的服务器。其含义是，这是一个暂时情况将得到缓解后，一些延误。如果知道的话，长度的延迟可以表明在重试，经过头。如果没有重试，经过考虑，应当处理的客户端的反应，因为它将为500的回应。

注：存在503状态码并不意味着必须使用一台服务器时成为超载。有些伺服器不妨简单地拒绝连线
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