Content Security Policy Report-Only: How to Collect and Analyze CSP Violation Reports

This story was originally published on HackerNoon at: https://hackernoon.com/content-security-policy-report-only-how-to-collect-and-analyze-csp-violation-reports.
Learn how to use CSP Report-Only safely: secure the reporting endpoint, normalize and group violations, fix issues, and enforce your policy with confidence.
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CSP Report-Only mode helps you discover what a new policy would break before enforcing it on real users. But collecting reports is not enough: you must secure the public reporting endpoint, validate and sanitize its data, and group related violations so you can separate real application problems from noise and decide what to fix before enforcement.