facebook服务的永久重定向响应。

The facebook server responds with a permanent redirect.

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当迁移主机的时候请使用永久重定向(301)。

Use a permanent redirect (301) when moving to a new host.

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执行从所请求URL到所指定 URL 的永久重定向，并提供用于完成响应的选项。

Performs a permanent redirection from the requested URL to the specified URL, and provides the option to complete the response.

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这样，搜索引擎和其他能够识别出永久重定向的useragents就会存储并使用与内容关联的新url。

This will cause search engines and other user agents that recognize permanent redirects to store and use the new URL that is associated with the content.

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对搜索引擎优化的影响：使用301重定向是告诉爬虫，旧的URLs已被新网址永久取代。

SEO impact: by using a 301 redirect, you are telling the spiders that the old URL has been permanently replaced by the new URL.

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有的开发人员和Web主机不把用户定向到404出错页，相反，却重定向到临时或永久的重定向页面。

Some developers and Web hosts instead redirect users to the 404 error page with a temporary or permanent redirect.

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有的开发人员和Web主机不把用户定向到404出错页，相反，却重定向到临时或永久的重定向页面。

Some developers and Web hosts instead redirect users to the 404 error page with a temporary or permanent redirect.

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