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For a long time web masters and SEO experts have tried to fight the objective duplication on sites using permanent redirects (301), the specific architecture, IIS and Apache settings, .htaccess definitions, etc. Looks, like these glorious times are passing away. Google, Yahoo! and Microsoft agreed and developed the “canonical” tag, which should help get rid of the objective duplication once and for all. Ask also expressed support for this algorithm. The logic is the following: to supply within <HEAD> … </ HEAD> this tag – Canonical tag should in principle solve the problem of discrepancies in the homepage address. Many content management systems (MOSS for example) do not care much about addresses unification, stable root in the homepage address, NOT-redirecting home page, etc. So here “canonical” comes. Thing to remember: rel = “canonical” is a hint, not an order. Search engines are likely to follow this hint in most cases, but also won’t forget about their own algorithm for determining the most relevant pages. Both absolute and relative paths are allowed in the canonical tags, but the absolute are preferred. If the rel = “canonical” returns a 404 error, the normal ranking algorithms for relevancy are on and the process goes on as it usually does. rel = “canonical” can be used in the redirect link. rel = “canonical” may be used only within the same domain New SEO tag “canonical” will help avoid duplication of content in cases with sessions ID and use of URLs for different sorting of items within the same page. "Canonical tags - use it or loose it" - related articles:
Categories: search engine optimization |
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