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I've got page, for eg. /about/ when after slash I put some numbers (not letters) I still get this same page. I really want 404 there.

Why? What to do to avoid that? SEO itp...

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Of note, this wouldn't be bad for SEO if you added the canonical tags to your headings, Google would see the canonical URL and realise they're the same page not 2 separate ones. Newer versions of WordPress will attempt to redirect the user, so what you're trying to do is totally unnecessary – Tom J Nowell Apr 19 '13 at 14:22
that's not good that two links or infinite number of links lead to this same page... – yzoja Apr 19 '13 at 17:10
Thats why you tell Google what the correct page URL is, hence the 'canonical' authorative, default, permanent URL. Google will then see "OOoooh about/3434 is just another way of saying /about/, lets forget the 3434 part ". So no SEO issues – Tom J Nowell Apr 20 '13 at 19:08

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