Engines like google don’t index 4XX pages as they don’t do the job. Therefore, they’ll disregard any canonical tags pointing to this sort of pages and sometimes wind up indexing the incorrect (non-canonical) Variation with the web page. php file. I should update the canonical link. I've earlier utilised jquery, nevertheless https://thesocialroi.com/story8567146/not-known-facts-about-automatische-hreflang-tags-en-canonieke-tags-seo