- Class
- C1 Mechanism
- Weight
- 8
- Severity on fail
- critical
- Applies to
Test this rule on a live site with the hreflang checker. Free, no account needed.
Scope and evidence
Evaluated on pages in P with annotations. The book marks this requirement REQUIRED, SEARCH-ENGINE-SPECIFIC.
Fail conditions
Each condition has a stable code and a reason template. The evaluator fills the placeholders from observed values only; no sentence in a report is generated.
not_fully_qualifiedThe hreflang URL “{href}” on {url} is not fully qualified. Google requires alternate URLs to include the transport method (http/https).
The documented fix
Build alternate URLs from the configured base URL.
Sources, quoted
These are the passages the rule rests on, stored once in the knowledge base and emitted exactly as written. A citation marked for specific conditions appears only on findings with those codes.
“Alternate URLs must be fully-qualified, including the transport method (http/https)”
[G-HREFLANG] Tell Google about localized versions of your page · Guidelines for all methods · last updated 2026-09-21
https://developers.google.com/search/docs/specialty/international/localized-versions