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Application & OT Security · Intermediate

Referrer-Policy

An HTTP header controlling how much of the referring URL the browser sends in the Referer header.

Definition

Values range from no-referrer to unsafe-url; strict-origin-when-cross-origin is the modern browser default. Restricting referrers prevents leaking tokens or sensitive paths in URLs to third parties.

Example

Referrer-Policy: strict-origin-when-cross-origin

Exam tip

Prevents tokens in URLs leaking to third-party sites via the Referer header.

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