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What is canonical Issue? How to resolve this issue?


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A canonical issue arises when 301 redirects are not properly in place. This means that your website can be accessed by search engines from several different URLs. This means that search engines can then potentially index your site under different URLs, meaning that it will look like a site of duplicated content.
 

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Canonical issues mean your website has multiple duplicate URL. Canonical issues come from 301 redirects when 301 redirects are not properly in place. When a website has several URL but the content of all pages is same that is called Canonical issue in SEO. Canonical is the process of selecting the best URL when there are several options.

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Except from being one of the most difficult words to write and pronounce… From the horse’s mouth: “Canonicalisation is the process of picking the best URL when there are several choices…”

 

There are now 2 different ways of fixing canonicalization issues to your site. Quite recently Google announced supporting a new “canonical tag” that lets you specify in the HTML header that the URL in question should be treated as a “copy” and names the canonical URL that all link authority and content metrics should flow back to.

Example:
Within the HTML header of the page loading on this URL https://www.vervesearch.com/index.php there would be a parameter like this:

<link rel=”canonical” href=”https://www.vervesearch.com/” />

This would “tell” the search engines that they should index the canonical URL specified in this tag and also weigh any link authority from the /index.php URL to the canonical URL. The rel=canonical tag should be implemented on every URL you have that is loading the same page (except from the main canonical URL you want to use of course).
This tag is really easy to implement and can solve a lot of canonicalization issues, BUT it has its limitations. For example you can’t use this for your country specific TLDs (which essentially a separate domain) or other additional domains you might have bought. There might also be issues with the fact that this tag only “redirects” the engines attention to the correct URL, users will still be able to use all the different URLs and within your analytics these are likely to come up as different pages.

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 Canonical issue is arises when 301 (permanent) redirect are not properly placed. search engine bots got confused to index the correct version of a website. The best method to resolve this issue is to use 301 redirects.

 

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Each homepage of the website can be accessed at six different URLs:

  1. www.site.com
  2. site.com
  3. www.site.com/
  4. site.com /
  5. www.site.com / index.html (or. php ,. asp, etc)
  6. site.com / index.html (or. php ,. asp, etc)

While it is true, with each of these URLs the visitor will get the same information, each URL can be indexed causing duplicate content in the search index. Finally, search engines track that these do not duplicate, but until then basically all of this is working against you. Even once it does, there is no guarantee that you will get 100% of the link associated with any of these versions.

The best solution is to add a canonical tag to the source page code:

<link rel = »canonical» href = »http://www.site.com» />

This tag tells search engines that www.site.com is the correct version for their index and link metrics.

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A canonical issue arises when 301 redirects are not properly in place. This means that your website can be accessed by search engines from several different URLs. This means that search engines can then potentially index your site under different URLs, meaning that it will look like a site of duplicated content.

There are two main ways to fix canonical issues on a website: by implementing 301 redirects, and/or by adding canonical tags to your site's pages to tell Google which of several similar pages is preferred. The right option depends on the canonical issue you're trying to resolve.

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