Engines like google don’t index 4XX pages simply because they don’t perform. Consequently, they’ll disregard any canonical tags pointing to these kinds of pages and sometimes wind up indexing the incorrect (non-canonical) version in the web page. Second chance: Disable this preference. When the "Blue" blend of the "iPod Shuffle" item https://socialdummies.com/story3683660/an-unbiased-view-of-was-ist-canonical-tag