Subdomain canonicalisation

[AshSEO2011]

Hi Moz fans,

I had a telephone conversation with an SEO company last week and they mentioned that the following "versions" of my domain were causing a canonicalisation issue;

http://www.example.com

www.example.com

example.com

I've already fixed the /index.html issue but do the above 3 also need to be fixed? Is the best solution to use a 301 redirect?

As a side note, the SEOmoz web app doesn't identify these as being duplicate content...

Regards, Ash

[Keszi]

Hey Ash,

If you use a canonical in the index.html, then when you load example.com or example.com/ or etc. etc. versions you basically load the index.html (in which there is configured the canonical link).

My developer usually makes a 301 redirect from non-www. to www. and we implement to canonical link into index.html and that is it

I hope it helped,

Istvan