Canonicalization, or more specifically the creation of duplicate content due to the way web server software handles variations on URLs, has become a much discussed topic here. Specific code snippets to resolve the problem in different situations have been widely discussed, but there is no single place that contains a list of different methods. I created this thread to list several of the more common ways of eliminating the two main types of canonicalization, www vs non-www duplication, and / vs /index.html canonicalization.

All of the examples I post will handle subdomain issues (www vs non-www), directory root issues (/ vs /index.html) and secure server (http vs https) issues if possible.

If you have any suggestions for other methods, please let me know and add them to the list.

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