SEO advice : How to build canonical url ?

I want to talk a little bit about canonicalization, www vs. non-www, redirects, duplicate URLs, 302 “hijacking,” etc.

What is a canonical URL? Do you have to use such a weird word, anyway?

Sorry that it’s a strange word; that’s what we call it around Google.

Canonicalization is the process of picking the best URL when there are several choices, and it usually refers to home pages.

For example, most people would consider these the same URLs:

www.example.com

example.com/

www.example.com/index.html

example.com/home.php

But technically all of these URLs are different. A web server could return completely different content for all the URLs above.

When Google “canonicalizes” a URL, we try to pick the URL that seems like the best representative from that set.

How to Setup

Simple Open your .htacces file vai any ftp client application and add the flowing code:

# BEGIN 
RewriteCond %{HTTPS} !=on
RewriteCond %{HTTP_HOST} !^www..+$ [NC]
RewriteRule ^ http://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
# END

Note: This will add “www.” even if there is already a subdomain.