CSP checker practical guide
A well-defined CSP limits malicious scripts. The right workflow is observe, tighten, then monitor.
Why CSP is now essential
Modern frameworks and third-party scripts increase injection surface quickly. A strong CSP limits unexpected execution even if an application flaw exists.
- Enable a report-only policy first.
- Fix legitimate sources flagged by reports.
- Switch to blocking mode once stable.
Common mistakes to avoid
- Allowing `unsafe-inline` without a reduction plan.
- Copying a generic CSP without adapting it to your frontend needs.
- Switching to blocking mode before monitoring violations.
FAQ
How long to roll out a clean CSP?
Usually 1 to 2 sprints for a standard website: observe, fix, then progressively enforce.
Is report-only enough?
No. Report-only is a calibration phase. Real protection comes from enforced policy.