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I believe many webmasters are familiar with 301 redirects. There is this passage in the Google Administrator Tools Help:
The 301 redirect feature is particularly useful in the following situations:
You've moved your website to a new domain and want to make the transition as smooth as possible.
People visit your website through different URLs. For example, if your homepage is accessible in more than one way, such as http://example.com/home , http://home.example.com , or http://www.example.com , select one of them as It's a good way to create a preferred (standard) destination URL and send traffic from other URLs to it via a 301 redirect. You can also use Webmaster Tools to set your preferred domain.
You are merging two websites and want to ensure that links pointing to out-of-date URLs redirect to the correct page.
However, I found that many webmasters only use 301 redirection when changing domain names or when a website has two domain names, and ignore the second instruction in Google Help. In fact, the second help of Google Admin Tools is particularly important for us in website optimization, especially the improvement of website PR value. Let me explain it to you in detail below:
The second article of Google Administrator Tools actually tells us not only to use 301 redirect when the website has two domain names, but also to do a 301 redirect for the website where we only have one domain name. Let’s think about whether our website with only one domain name would have such a situation——
These links all point to the same page (Xu Tao’s website optimization blog homepage):
http://www.xutaoblog.com/default.asp
But from the perspective of the process of sending requests to URLs and returning web page content, these URLs are all different from each other. For the above URLs, the web server can return completely different content. When the contents corresponding to these URLs are the same (generally the same). As a result: the PR value of your site's main domain name is scattered to several other URLs.
When Google includes your website, it needs to select a representative one from the above URLs and ignore the rest. Then the URL selected by Google is a standardized URL. This process chosen by Google is called "normalization." If you use 301 redirection to redirect the other three URLs to: www.xutaoblog.com, then Google will know the URL you want, and PR will focus on the main URL: www.xutaoblog.com .
The above is the significance of 301 redirection for URL standardization that is ignored by everyone in website optimization. (Tip: Friends who don’t know how to redirect URLs can read this article I collected online: Teach everyone how to understand 301 redirects and how to do 301 redirects http://www.xutaoblog.com/post4/20100122306 .html )
Xu Tao (brother never plays lonely) stays
This article is original by Lao Xu, the first address is Xu Tao’s website optimization blog