Introduce strict Content Security Policy without breaking paid storefronts
The practical problem
A legacy site has inline scripts and payment buttons that may fail under a newly enforced CSP, creating a business outage.
Implementation protocol
Start in report-only mode, inventory owners and inline handlers, migrate to controlled nonces or hashes, then test before enforcement. Keep a documented rollback.
Worked scenario
An isolated trial with a nonce-based script policy reveals each blocked listener while existing checkout remains protected by the current safe policy.
What could go wrong
Adding unsafe-inline solely to silence errors weakens XSS defenses.
Acceptance criteria
Test real critical flows and independent subdomains before deploying a stricter policy.
Source material and evidence boundaries
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