TestingURL.dev
by Geekflare

« Canonical tags & meta robots directives

Canonical: tag vs. header conflict

A canonical URL can be declared two ways: an HTML tag, or an HTTP response header. This page sets both, and they disagree.

<link rel="canonical"> tag sayshttps://testingurl.dev/scraping/crawler-directives/canonical-conflict
Link HTTP header sayshttps://testingurl.dev/scraping/crawler-directives/canonical-self

There's no universal rule for which one wins. Worth checking how whatever tool you're building handles it, and documenting the choice, rather than assuming one source is authoritative.