Canonical URLs - a new method of dealing with duplicate content - Profit Hunter

With support: Exclusio. Ru? we opened

Google, Yahoo and Microsoft announced a new tag that can be used to tell search engines what URL this page has.

Let's look at an example. Different URLs may lead to the same page, for example:

http: // www. example. com / product. php? item = some-item

http: // www. example. com / product. php? item = some-item. category = cat1

http: // www. example. com / product. php? item = some-item. trackingid = 1234. sessionid = 5678

Now you can add a tag. link. in the section. head. , to indicate the preferred version of the address:

. link rel = ”canonical” href = ”http: // www. example. com / product. php? item = some-item ”/.

And search engines will understand that duplicate pages

http: // www. example. com / product. php? item = some-item. category = cat1

http: // www. example. com / product. php? item = some-item. trackingid = 1234. sessionid = 5678

are in fact the canonical page http: // www. example. com / product. php? item = some-item.

Some technical details:

URL in the tag. link. may be relative and absolute. To avoid mistakes, it is better to use an absolute path.

Tag. link. may indicate a canonical URL within a domain / subdomain, but not a different domain. For example, http: // test. example. com may indicate http: // www. example. com, but not on http: // mysite. com.

Tag. link. behaves like 301 redirect, in the sense that all the "additional properties" of pages (PageRank, incoming links ...) are transmitted to the canonical page.

Tag. link. transitive, i.e., if A points to B as a canonical address, and B points to C as a canonical address, then C becomes canonical for both B and A.

Search engines reserve the right to use their algorithms to eliminate the "wrong" use of the tag. link. . That is, if the content of the page and the specified canonical page is significantly different, then the canonical link may be considered erroneous.

The support for the new tag was announced on February 12, but the Canonical URL plugin for WordPress, the Magento canonical URL's extension and the module for Drupal are already written and available for download.

With the support:

On this seo blog they distribute free scripts that may be useful to you.

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