What to change
Treat the declared preferred address as a dependency that must itself work. Ask the supplier to show its response and content alongside the referring page. If a rename caused the failure, identify the genuine successor before changing the declaration. Add that relationship to routine release validation so a later route change cannot silently break it again. A syntactically valid URL is insufficient acceptance evidence.
A worked example
Illustrative example
Illustrative test: Inspect a guide whose route changed during the latest release rehearsal.
How to check the result
The canonical target serves the intended content successfully and is eligible under the agreed policy.
A mistake to avoid
Automatically replacing every failed canonical with the homepage creates false equivalence.
Your action checklist
Use these checks to prepare a discussion with your team or supplier. Tick a check when you have recorded the decision or evidence, rather than when a feature has simply been promised.
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Further reading
These primary sources provide additional context for the project decisions above.
Related decisions
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