当一个网站停止维护时，正确的 HTTP状态码是什么？

有什么 HTTP状态码可以告诉谷歌(和其他公司)去 走开，待会再给我索引吗？

基本上，就是在语义上告诉客户网站停机维护？

我考虑过的是

304 => Not modified
307 => Temporary redirect
410 => Gone
503 => Service Unavailable

我倾向于最后一个，但只是好奇哪一个是 适当的的选择。

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最佳答案

HTTP 503 - Service Unavailable would be the most appropriate.

The Web server (running the Web site) is currently unable to handle the HTTP 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.

This post on the Google Webmaster Central Forum is also relevant:

Yes - a 503 is the correct server response for "We're closed". If you substitute a normal HTML page saying "We're closed" and serve a 200 it's very likely to get indexed by Google.

If you give the Googlebot a 503, it will just go away and come back later without indexing what you give it.

UPDATE:

As for the php implementation, you may be interested in checking out the following article:

Also notice the retry-after header, where you can specify after how many seconds another request should be re-attempted.

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I'd consider the 503 to be most appropriate, since the 5xx-group is meant for server errors in general.

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503 Service Unavailable

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From http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=40132

503 (Service unavailable) The server is currently unavailable (because it is overloaded or down for maintenance). Generally, this is a temporary state.


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