Rules / canonical rules

canonical.href.absolute

Default

error

Plugin

canonical

The canonical href is an absolute URL.

Why: Search engines may resolve a relative canonical link differently than you expect, such as against another domain that serves the same page.

When off: relative canonical links pass.

<!-- ✗ Fails -->
<link rel="canonical" href="/about/" />

<!-- ✓ Passes -->
<link rel="canonical" href="https://example.com/about/" />

References

• Google: How to specify a canonical URL: Google recommends absolute URLs, because relative ones can cause problems.