Missing Referrer-Policy header
What this means
The response sends no Referrer-Policy, so full URLs — including any sensitive query parameters — can leak to third-party sites in the Referer header.
How to fix it
Send Referrer-Policy: strict-origin-when-cross-origin.
Fix effort
This check is auto-fixable: the change can be written and validated automatically, so CrawlX can open it as a pull request for review.
Authoritative source
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