# Pages with a relative canonical URL A per-URL report: one row per page that matches, over the pages a crawl reached. ## What this report returns These pages declare their canonical with a relative href. RFC 6596 permits it, but a relative canonical inherits whatever base URL the page resolves against, so staging hostnames, protocol switches, and trailing-slash differences silently change what it points at. **How to fix it.** Make the href absolute: ``. A best-practice nudge, not a validity failure: a relative href alone leaves the page valid, which is why the Usability Issue Detected column is here — it is false on a page whose only quirk is this one, and true where the canonical also has a real defect (an empty href, a tag outside the head, conflicting tags, an unusable URL) worth fixing first. Security checks are provisional; precision has not yet been measured. A clean row is not a security assessment. ## The columns it shows Every defect this technology can carry is a column in the grid, worst first, so nothing is hidden behind a filter you have to know to apply. - Canonical Relative`canonicalRelative` - Canonical Usability Issue Detected`canonicalUsabilityIssueDetected` - Canonical Security Risk Detected`canonicalSecurityRiskDetected` - Canonical Findings`canonicalFindings` - Canonical URLs as Written`canonicalHrefs` - Ruleset Version`rulesetVersion` - Security Check Status`securityCheckStatus` - Related Security Frameworks`securityFrameworkReferences` ## About Canonical URL Tells an agent which address is the real one for this page. [Read how Canonical URL is checked](https://agentic-readiness.lumar.io/docs/discoverability/canonical), including the specification it is validated against and a worked correct and broken example. ## Running it This report comes with Agentic Readiness in Lumar and appears on every crawl of any project that has it turned on. [See the whole set](https://agentic-readiness.lumar.io/scan-at-scale), or check a single URL with the [scanner on this site](https://agentic-readiness.lumar.io/), which runs the same code with no account. [Get Lumar pricing →](https://www.lumar.io/pricing/)