Last year Google, Microsoft, Ask and Yahoo announced the support for Canonical Links in an attempt to help alleviate duplicate urls on sites. This will help prevent indexing of multiple urls that point to the same page.
The syntax is rather simple:
…should be specified in the HEAD section as…
<link rel=”canonical” href=”http://www.someurl.com/mypage.htm” />
This simply tells the search engines that the preferred location for the URL is http://www.someurl.com/mypage.htm
If you view any SoftLayer web page on the corporate website, you can see canonical URLs in action.
Why would I need to utilize Canonical Urls?
Good question and here’s why…
The reasons behind the need for canonical urls are simply to help webmasters eliminate self-created duplicate content. Repeat after me: Duplicate content is BAD!
Interested in learning more about Canonical Urls?
Joachim Kupke, from Google, created a lovely slide show with all the information you could want about Canonical Links.