I noticed when I enter...
http://domain.com/product
and
http://domain.com/product/
they both are treated as a separate page and don't redirect. This is bad SEO practice and is considered duplicate content which Google doesn't like.
For instance on http://www.mattcutts.com/ if you enter either of these
http://www.mattcutts.com/blog/seo-advice-url-canonicalization
http://www.mattcutts.com/blog/seo-advice-url-canonicalization/
http://mattcutts.com/blog/seo-advice-url-canonicalization
http://mattcutts.com/blog/seo-advice-url-canonicalization/
they all redirect to http://www.mattcutts.com/blog/seo-advice-url-canonicalization/
By default Nop gives each of these variations its own page which is seen by search engines as duplicate content.
I understand Nop 3.20 has a fix for the www vs non-www issue, but is there any kind of fix for the trailing slash / vs non-trailing slash at the end of the URLs?