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    <p>I think Google just announced the answer to my question: <a href="http://googlewebmastercentral.blogspot.com/2009/02/specify-your-canonical.html" rel="noreferrer">the <code>canonical</code> link relation for declaring the canonical URL</a>.</p> <p><a href="http://www.google.com/s2/profiles/112810134285899618775" rel="noreferrer">Maile Ohye</a> from Google wrote:</p> <blockquote> <blockquote> <p>MickeyC said...<br> You should have used the Content-Location header instead, as per:<br> <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html" rel="noreferrer">http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html</a><br> "14.14 Content-Location"</p> </blockquote> <p>@MikeyC: Yes, from a theoretical standpoint that makes sense and we certainly considered it. A few points, however, led us to choose :</p> <ol> <li><p>Our data showed that the "Content-Location" header is configured improperly on many web sites. Sometimes webmasters provide long, ugly URLs that aren’t even duplicates -- it's probably unintentional. They're likely unaware that their webserver is even sending the Content-Location header. </p> <p>It would've been extremely time consuming to contact site owners to clean up the Content-Location issues throughout the web. We realized that if we started with a clean slate, we could provide the functionality more quickly. With Microsoft and Yahoo! on-board to support this format, webmasters need to only learn one syntax.</p></li> <li><p>Often webmasters have difficulty configuring their web server headers, but can more easily change their HTML. rel="canonical" seemed like a friendly attribute.</p></li> </ol> </blockquote> <p><a href="http://googlewebmastercentral.blogspot.com/2009/02/specify-your-canonical.html?showComment=1234714860000#c8376597054104610625" rel="noreferrer">http://googlewebmastercentral.blogspot.com/2009/02/specify-your-canonical.html?showComment=1234714860000#c8376597054104610625</a></p>
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