Question 1

What are HTTP security headers?

Accepted Answer

HTTP security headers are response headers sent by a web server that instruct the browser to activate defensive mechanisms — such as blocking script injections (CSP), forcing encrypted connections (HSTS), preventing framing (X-Frame-Options), or isolating window contexts (COOP/COEP).

Question 2

What makes a security headers checker 'advanced' vs. a basic checker?

Accepted Answer

A basic checker only verifies if a header exists. An advanced checker like Statflare audits the actual directives inside the headers. For example, it checks if your CSP contains unsafe-inline bypasses, or if your HSTS max-age is at least one year and includes subdomains and preloading.

Question 3

Why do modern cross-origin headers like COOP, COEP, and CORP matter?

Accepted Answer

COOP (Cross-Origin-Opener-Policy), COEP (Cross-Origin-Embedder-Policy), and CORP (Cross-Origin-Resource-Policy) are modern standards designed to enable cross-origin isolation. They protect websites against hardware-level side-channel attacks like Spectre and prevent cross-window data leaks (XS-Leaks).

Question 4

How do I add or modify security headers on my website?

Accepted Answer

Security headers are added at the server level. You can configure them in Next.js (next.config.js headers), Cloudflare (Transform Rules), Vercel (vercel.json), Nginx configs, Apache (.htaccess), or Netlify (_headers), without modifying any of your application's source code.

Question 5

How does this compare to securityheaders.com?

Accepted Answer

StatFlare checks all the headers securityheaders.com grades — CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, X-Permitted-Cross-Domain-Policies, COOP, COEP, and CORP — plus extra signals it doesn't score: a deprecation notice for X-XSS-Protection, a Reporting-Endpoints/Report-To configuration check, and Server/X-Powered-By information-disclosure detection. That's 13 checks total, each with a what-if simulator and copy-paste fixes for six hosting platforms.

Security Headers Tool

Frequently Asked Questions

More Free Tools