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How to Enforce a Strict Referrer Policy in Python

Validate HTTP headers to enforce a strict same-origin Referrer policy, accepting only origin-only URLs or absent Referer values.

referrer security headers

Python

import re
from unittest.mock import patch

def strict_referrer_policy(headers):
    """Return True if Referer header is absent or strictly same-origin."""
    referer = headers.get("Referer")
    if referer is None:
        return True
    # Strict-Origin-When-Cross-Origin allows same-origin full URL
    # but here we…

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