了解使用重定向HTTP_HOST [英] Understanding redirection using HTTP_HOST

问题描述

我目前正在经历上重定向的教程，并已变得稍微困惑。
以下是应该为当前站点的所有请求重定向到一个新的领域。

I am currently going through a tutorial on redirects and have become slightly confused. The following is supposed to redirect all requests to the current domain to a new domain.

RewriteCond %{HTTP_HOST} old_domain\.com [NC]
RewriteRule ^(.*)$ http://www.new_domain.com/$1 [L,R=301]

不过是什么 HTTP_HOST 的目的是什么？它包含什么？对我来说， HTTP_HOST 包含当前的主机名？ （ old_domain.com ），因此我上面的规则的理解是，它是包含旧域名，然后再按旧域的字符串测试？ old_domain.com/old_domain.com

However what is the purpose of HTTP_HOST? What does it contain? To me HTTP_HOST contains the current hostname? (old_domain.com) therefore my understanding of the above rule is that it is testing for a string containing the old domain followed by the old domain again? old_domain.com/old_domain.com

应该不会有呢？

RewriteCond %{HTTP_HOST} [NC]
RewriteRule ^(.*)$ http://www.new_domain.com/$1 [L,R=301]

另外一个例子来帮助理解如何将您重定向到 mysite.com 的请求（其次是没有别的，所以基本上到索引页面请求） mysite2.com 使用 HTTP_HOST ？

As another example to aid understanding how would you redirect a request to mysite.com (followed by nothing else, so essentially a request to the index page) to mysite2.com using HTTP_HOST?

感谢。

推荐答案

该条件检查提供的主机％{HTTP_HOST} 对旧的。所以，如果一个请求进入与主机old_domain.com服务器那么接下来的规则应该运行。如果主机为别的，甚至www.old_domain.com，那么接下来的规则将被跳过。

The condition is checking the supplied host %{HTTP_HOST} against the old one. So if a request comes into the server with the host "old_domain.com" then the next rule should be run. If the host is anything else, even www.old_domain.com, then the next rule will be skipped.

如果说一种方式，％{HTTP_HOST} 是用户传递给服务器。这个条件会检查用户再次提供什么你写的规则。

To say it another way, %{HTTP_HOST} is what the user passes to the server. That condition checks what the user supplied again what you've written rules for.

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