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Rule · Canonicalization

Canonical headers on non-HTML files

SEO-CANON-06C4 Informational· w0informational

Class
C4 Informational
Weight
0
Severity on fail
info
Applies to
Any engine

Test this rule on a live site with the canonical tag checker. Free, no account needed.

Scope and evidence

Evaluated on fetched non-HTML URLs. The book marks this requirement SUPPORTED.

Observations

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.

  • canonical_header

    {url} sends a Link: rel="canonical" header naming {target}, which is {absoluteness}.

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.