Case study: The use and problems of canonical label

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If you are aware of Baidu search in search of certain keywords, often appear in the Site list or article page not the first page appears in the search results, the first page is not a trace of the situation. As shown in the picture, Baidu search "Sportsman Street big men small Embellishment", the second page of the article was taken as the main page to participate in the rankings. Believe that ordinary search users will also be dissatisfied, often need to click the search results, and then click on the first page of the page to start browsing. Baidu officials on this also exist doubts, coupled with a large number of webmaster long-term reflection and demand, Baidu finally began in 2013 to support the canonical tag, through webmaster and search engine cooperation to solve this problem.

Baidu's introduction to canonical is:

For a group of content exactly the same or highly similar to the Web page, by using the canonical tag can tell the search engine which page is the canonical page, can standardize the Web site and avoid multiple content in the search results of the same or similar pages, to help solve the problem of duplicate content collection, Avoid the same content Web site repeat display and weight of the dispersion, improve the weight of the standard Web page, optimize the standard page rankings.

A specification page is a preferred version of a Web page that is identical or highly similar to a group of content. The canonical label is used by creating a LINK element in the section of the nonstandard Web page, in the form of. Add this link and properties can tell Baidu: "In the content of the same or highly similar to all the pages, the page is the most canonical and most valuable page, recommend the page in the search results in front of the position." "In other words, when searching for related keywords, the Spec page is ranked as the main page and reduces the situation in the above example."

The common need to use the canonical tag is as follows.

(1) Because of the space display problem, the article has been paginated, if the title of each page is identical or only with "Ⅳ page" distinction, in order to avoid the problem in the above example, you can use the canonical label for pagination outside the first page. Of course, if you have the ability, recommend to the article pagination use the form mentioned before: the length of the article, with small title for the boundaries of the page, each page has its own optimization of the main keyword, home optimization core keywords, so there is no need to use canonical.

(2) Due to the site functional settings, the same page produced a different URL, and because of the problem of function settings, so that can not directly use 301来 to solve this problem. For example, in the previous URL optimization considerations mentioned above, the thousand products network for the main link in the site to add tracking user behavior parameters of the content.

(3) The same content list, according to the price, time, credit, popularity, sales and so on to sort out the page content and the default sort height similar to the situation, such as the mall's merchandise list page and rental listings page. If the order of Non-default conditions also produces different URLs and allows search engines to crawl and include them, it is necessary to use the canonical tag for lists that are not sorted by default. Of course webmaster and SEO personnel can also according to the situation of different sorting conditions of the list page to optimize different keywords, for example, by price order can optimize the "most expensive * *" "the highest price of * *" "The Highest Prices *" "the cheapest * *" the lowest price * * "" the best Cost-effective * * "and other keywords, However, to do the design, so that the different sorted list content does not have a large area of duplication, so that these list pages can get more search traffic, and there is no need to use the canonical tag.

(4) Mall class site, the same product has a number of historical versions of the case, you can use canonical labels on the historical version of the page.

(5) After the site revision or change the domain name, for various reasons can not set 301 Redirect, you can use the canonical tag to mark the new version of the page URL.

In a word, it is necessary to use the canonical tag when a set of page content is almost identical and has some logical relationship. Now there are some articles on the network to recommend the directory, lists and columns to use the canonical tag is not very appropriate, indeed there are a lot of list pagination instead of the first page to participate in the rankings, although the table of contents, list and column paging use canonical has no major side effects, But canonical is not used to solve this problem, it is said that in the future Baidu will introduce a special paging label, this tab should solve the problem, canonical more is used for duplicate content pages.

You can use relative links in the Canonical tab, or you can use absolute links. For security reasons, it is recommended that you use absolute links to avoid unknown errors. It is important to note that, although the site changes and change the domain name, if you can not configure 301 Redirect, you may use the canonical tag to mark the new page URL, but this is only unable to configure the circumstances of the helpless, and can not use the canonical tag to replace the 301 redirect weight overlapping role. Although the introduction of canonical, Baidu mentioned "to promote the weight of standardized web pages, optimize the standard page rankings", but canonical tag is actually just tell the search engine which version of the URL is the main version, not necessarily the weight of the non-standard page to the specification page.

In addition, Baidu official has said that Baidu will not necessarily comply fully with rel= "Canonical" label, Baidu will be based on the webmaster recommendations and their own system algorithm to synthesize the choice. Webmaster and SEO personnel will often dig out the role of the label itself, may Baidu in order to avoid the support of new tags to increase the corresponding algorithm loopholes, so the canonical label has a relatively conservative support.

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