SEO Canonicalisation

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Canonicalisation in terms of SEO

Show Google which one is the Preferred URL or Main URL

Canonicalisation Code Implementation

<link rel="canonical" href="http://example.com" />

Similar Pages in the eyes of Google

All below pages are the same:

General

  • http://www.example.com/
  • http://example.com/

Apache Web Server

  • http://example.com/index.html
  • http://www.example.com/index.html
  • http://example.com/index.php
  • http://www.example.com/index.php

Microsoft Internet Information Services (IIS)

  • http://www.example.com/default.asp (or .aspx )
  • http://example.com/default.asp (or .aspx)

Use Redirection to the Preferred URL

This has to be considered if we have exactly same page with multiple URL's as mentioned above.

  • 301 HTTP status code : Moved Permanently
  • 302 HTTP status code : Moved Temporarily

Canonicalisation for Various Parameters in the URL

  • http://example.com/
  • http://example.com/?track=123
  • http://example.com/?track=431

In this above example, the parameter "track" is being used for tracking, in which case the content of the page remains the same.

This has to be explained to Google in order prevent duplicate content issues

Hence canonicalisation is important in terms of On Page SEO

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