Canonical URL references a different protocol or host than the current page, causing indexing issues.
By Seoxpert Editorial · Published
When a page's canonical tag points to a different protocol (HTTP vs HTTPS) or host (www vs non-www), search engines may split ranking signals between URLs. This can dilute SEO value and cause duplicate content issues, making it harder for your preferred URL to rank.
If unresolved, search engines may not consolidate signals, harming rankings and causing inconsistent indexing.
A crawler compares the page's URL with the canonical tag and flags if the protocol or host differs.
Incorrect canonical (different protocol and host)
<link rel="canonical" href="http://www.example.com/page.html" />Correct canonical (matching protocol and host)
<link rel="canonical" href="https://example.com/page.html" />No, it's best practice to canonicalize to HTTPS, as it is more secure and preferred by search engines.
Pick one (www or non-www) as your canonical host and use it consistently in canonical tags and redirects.
Cross-domain canonicals are only appropriate for syndicated content; otherwise, it can confuse search engines and split signals.
Ensure both are consistent. If you redirect to the canonical, the tag should match the destination.
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