Engines like google don’t index 4XX pages because they don’t get the job done. Because of this, they’ll ignore any canonical tags pointing to this sort of pages and infrequently wind up indexing the incorrect (non-canonical) Model on the web page. che voi sappiate c'e' modo di integrare nel codice di https://bookmarkfavors.com/story4359491/was-ist-canonical-tag-an-overview