Hi Nicholas
As u state, "If the URL generates a 404 it means that it is wrong".
The sitemap generating program (
www.check-domains.com/
) is picking up these 404 errors.
Also, see "Redirects". When u search for check-domains (see check-domains-screenshot).
Re "HikaShop doesn't create invalid URLs by itself".
Please note that these are the "unpublished" products so the 404 redirects are valid.
BUT, only 2 or 3 and not a 404 error page for every category in the database.
See "Redirects".
Search for "193".
There are 48 (3 pages) 404 pages of that single "unpublished" product "193-Classic-army-1911a1".
48, 404 error pages for assorted categories in the database.
Also, the last listing (incorrect category) is indexed in Google's database (see 193-screenshot).
Is this is a problem with Hikashop working with Joomla redirects.
Re "When you let HikaShop generate the URL and not set a canonical URL, you can indeed end up with several URLs".
That mean that a canonical URL is ESSENTIAL to avoid creating multiple pages in all categories???
Again, Is Hikashop is creating pages in every category for ALL "published" products???
I cannot say for sure that this product had a canonical URL but i advised Paul 2 years ago to make certain the canonical URL is there.
Anyway, it seems as if all "unpublished" products, with or without a canonical URL are listed in multiple categories.
Also, auto canonical URLs were activated in Hikashop approx 2 years ago.
Re "you won't be penalized by Google and it will deindex the other URLs leading to that page".
As long as u are sure that Google will not penalise this site, I am happy.
Thanking You
Patrick Pac