Sep 12
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Posted by Kevin Graves This post was originally in YouMoz , and was promoted to the main blog because it provides great value and interest to our community. The author’s views are entirely his or her own and may not reflect the views of SEOmoz, Inc. On February 12th, 2009, Google began to support the link rel=”canonical” tag, which was later adopted by Bing and Yahoo, for specifying a preferred version of a URL.
Here is the original post:
How To: Advanced rel="canonical" HTTP Headers