Website Security Headers: A Practical Pre-Launch Guide
HTTP response headers can tell browsers to enforce useful security behavior. They are worth checking before launch because they are easy to omit during a hosting or framework change, but they should not be confused with a complete security audit.
HTTPS comes first
Security headers do not compensate for an invalid certificate or mixed transport setup. Serve the production site over HTTPS and redirect insecure HTTP requests to the preferred HTTPS URL. Confirm third-party resources used by the page also load securely.
Strict-Transport-Security
HSTS tells supporting browsers to use HTTPS for a host for a defined period after receiving the header over a secure connection. It can reduce downgrade opportunities, but it should be deployed deliberately. Long durations and subdomain coverage can make mistakes harder to recover from if some related hosts are not ready for HTTPS.
X-Content-Type-Options
The X-Content-Type-Options: nosniff header asks browsers not to reinterpret certain resource types beyond the declared MIME type. It is a small, broadly useful hardening measure when your server sends correct content types.
Referrer and permissions policies
A referrer policy controls how much source URL information the browser sends when navigating or requesting resources. Permissions Policy can restrict access to capabilities such as camera, microphone and geolocation. Choose settings based on the application behavior you actually need and test them before production.
Framing protections
X-Frame-Options and the frame-ancestors directive of Content Security Policy can limit who is allowed to embed a page in an iframe. This may help reduce clickjacking risk. Some legitimate products need embedding, so the correct rule depends on the application.
Headers are not the whole security story
A site can receive every recommended header and still contain vulnerable code, exposed credentials, insecure authorization, outdated dependencies or unsafe server logic. Treat header checks as one layer. Security work also includes dependency maintenance, secret handling, input validation, authorization testing, logging, backups and incident response.
Automated checks can confirm whether a public signal exists and looks technically reasonable. They cannot replace human review of content, accessibility, security, business logic or legal requirements.
Check a website