Two types of redirects that seoer must know

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With the recent buzz about using 301 redirects or using rel=canonical discussions, I've gathered a summary of the following questions from most people about these two redirects:

1. When should I use the REL canonical label instead of 301?

2, the use of REL properties will be harmful to the site?

3. When should I not use rel cannoical?

4. What if I'm not able to get developers to implement 301 redirects?

Below I will answer to these questions one by one, hope everybody exchanges together.

When do I use 301 redirects?

301 redirects are designed to help users and search engines find content that has moved to a new URL. Adding 301 redirects also means that the content of these pages will be permanently moved to a new location.

1. What is the use of 301 redirects to users?

For users, they may never notice URLs that are directed to new places unless they notice the URL changes in their browser's address bar. Even if they notice the changes in URLs, they will not be affected as long as the content they originally wanted is still there. Therefore, from the point of view of the user happy, 301 redirect is very good, as long as you redirect a URL will not let them confused.

2. What is the use of 301 redirects to search engines?

Theoretically, if a search engine discovers that a URL is 301 redirected, they will find a new URL along the redirected URL instead of indexing the old URL, and they will also transfer the existing URL link weights to the new URL, even if they cannot guarantee that 100% Transfer the weight of these links or transfer the anchor text. But Google has said that 301 redirects can deliver anchor text, but there is no guarantee that it will be delivered. In theory, search engines can also remove old URLs from the index library, so that their users won't find them again. This can usually be done over a period of time, generally not more than a week. I've seen some old pages removed from the search engine that took only a few days to complete. But there are two major pitfalls when using 301 redirects:

First, it is not known to differentiate between 301 redirects and 302 redirects.

302 redirects are also thought to be temporary redirects, a Web browser instruction to display different URLs that the browser is required to display, used when a Web page undergoes a change in a short-term URL. A temporary redirect is a server-side redirect that can be handled correctly by search engine spiders. The difference between 301 and 302 is that 302 redirects are temporary redirects, and search engines crawl new content and save old URLs. As the service goes to 302 code, the search engine thinks the new URL is only temporary. 301 redirects are permanent redirects, and search engines also exchange old URLs for redirected URLs as they crawl new content.

Second, redirect all pages to a URL.

This is another extreme example I have encountered, and recently received a foreign customer site to make this mistake. If your site has 500 pages to move to elsewhere, you should redirect all 500 pages to the most relevant pages of the new site with 301. But I often find that some people redirect all 500 pages to a page, such as a homepage. Although this is not a good idea, but most people in order to transfer the weight of the link to the new page, in order to make the new page weight higher, in fact, Google has emphasized the harm of this approach.

3. When do I use 301 redirects?

First, when you remove the site

When the site is removed, make sure to use 301 Redirect to a new location or change your site URL structure, in which case you do not want the user or search engine to see the old site. In particular if the removal takes place due to a new design or structural change. Google has given clear guidance on this, and given suggestions for using 301 redirects in this case, you can look at the Google Admin help documentation.

Second, when the end of the site content

If you have content on the site, the product is terminated, or the new content is not relevant to what your users are seeing, use 301 redirects. When you want to remove old content, here are some points to note:

First check your links to see if the content allows the search engine to have access, if you remove the content will potentially break down the spider path, so be sure to check in the removal; second, to see if the new address is similar to the one you're removing, and when you remove it, try to orient the content as much as possible. to ensure spider access; Again, consider whether the content will be used in the future, for example, if you have a commercial site and want to remove products that you are not selling, consider whether the product will be restored in the future, that is to say, later on.

Third, the home page has many versions of the time

This is another misunderstanding, we have to as much as possible to make the homepage only one version, but we often encounter several versions of the site home page, that is, the main domain name problems, such as:

Http://admin5.com,

http://www.admin5.com/index.php,

Http://www.admin5.com/index.html,

In this case, we must choose one as the primary domain, to avoid the weight dispersion. However, with the exception of anything, the only exception is that if you want to show which user is connecting to the host on the network or to judge cookies, we'd better use rel=canonical instead of 301 redirects.

When to use the Rel=canonical label?

Relatively speaking, in the SEO industry, this is a new tool, its first announced use in 2009 of February, indeed not very long. When I mentioned these times, I read a lot of help documents about this tag, and I saw this tag on some users ' websites, but it made me feel terrible because they put this tag on all the pages and they all point to the homepage of the website, And Google will pay attention to this tag and will not index most of the content of the site. Google says they will not necessarily follow the label, but they will use it as an experience. So when do we use this tag?

1. When 301 cannot be used

The unfortunate situation is that when 301 is difficult to handle, or the developer does not know how to use the 301, or the CMS does not allow you to use 301, it is necessary to use this tag. Technically, it's easier to redirect with the rel=canonical tag because it doesn't have to solve the service problem, just add the attribute to the tag.

2, a page of a variety of navigation forms

This is a common problem in large business sites where some directories and sub directories may need to be combined in a URL, for example, you might encounter:

Www.admin5.com/A/B

Www.admin5.com/B/A

Theoretically, both types of pages can reach the same results, a 301 redirect will be appropriate when you want to keep the URL in the same format, the result in this case rel=canonical will play a better role. Moreover, if this situation were to be avoided in the first, the solution would be more perfect.

3, dynamic URL static

Dynamic URLs are variable, depending on the user's different session ID to a different page, in which case it is not necessary to add 301 redirects per page, in which case the rel=canonical will be used.

When can you not use rel=canonical?

1, the new station can not be used

I've seen some new Web sites using rel=canonical, which is not the original purpose of this label design, and if you're lucky, this tag may improve your site structure and make sure your site is mirrored. But the fact is not always as good as you think, so for the new station, do redirect or do not use this tag.

2. Do not use in the page callout section, at least pay more attention when using

It's hard, unless you really know what you want, I've always avoided using this tab in the page callout section.

3. Redirect your whole site to a page

If you want to direct your entire station to a page, then using this tag will not outweigh the cost, because you have so many pages, it will be a time-consuming thing.

Overall, when using 301 and cannonical labels, pay more attention, if you do not choose the right way to do, it will hurt your site very much. If you are not 100% sure which way to do redirects better, then first in the small scope of the results of the URL test to see what will change, if all OK, then slowly spread to the whole station. If you have to say which way is best, I think you should always remember what you want to let users see or what you want to see to the search engine, and then you have to do it again, I think you will learn a lot of things in the direction of redirection, in fact, this is your SEO level of a process. This article by the ph electrode www.kedida.com.cn original, welcome everybody to exchange the discussion!