Headers provide browser instructions
Security headers can limit resource loading, framing, referrer information and risky browser capabilities. They complement secure code, authentication, updates and monitoring rather than replacing them.
Deploy CSP carefully
A restrictive Content Security Policy can block attacks but also break legitimate scripts, styles or integrations. Begin with an inventory and report-only testing before enforcing a production policy.
Publish a responsible contact
A security.txt file gives researchers a clear disclosure route. Keep contact and expiry information current, serve the file from the standard location and establish an internal response process.