zehrila - 10:22 pm on Apr 25, 2011 (gmt 0)

What to do if you have 3 versions of same URL, served through same php file. E.g

1: example.com/Green-Blue-Widgets.html <--- Actual url
2: example.com/green-Blue-Widgets.html <--- look at small letter for word Green. I don't know how google pulled that out.
3: example.com/Green-Blue Widgets.html <--- See the space between Blue and Widgets.

Now would adding a canonical tag mentioned below in php file will sort out this duplication issue?

<link rel="canonical" href="http://example.com/Green-Blue-Widgets.html" />

This is will show the canonical tag in all 3 versions of url, 2 bad ones and 1 right one. Wondering if its right?