Developer Tools

HTTP Header Checker

An HTTP header checker fetches a URL and lists response headers — HSTS, CSP, cache-control, server, set-cookie flags — for security audits and CDN debugging.

How to use this http header checker tool

Enter the full HTTPS URL to inspect.
Run the header check and review status code plus headers.
Look for Strict-Transport-Security, Content-Security-Policy, and X-Frame-Options on public sites.
Fix missing security headers at your CDN or reverse proxy.
Retest after deploy to verify caching headers for HTML vs assets.

About this http header checker tool

An HTTP header checker fetches a URL and lists response headers — HSTS, CSP, cache-control, server, set-cookie flags — for security audits and CDN debugging.

Paste a link above before launch to confirm staging noindex or production HSTS preload.

Developers compare API gateways and static hosts without curl in a terminal.

DevOps uses http header checker after CDN cutovers to confirm cache-control, HSTS, and CSP headers at the edge.

Why use VSPIC for http header checker?

Full response header list in readable UI.
Security-focused field highlights where implemented.
Complements SSL checker and link checker.
No curl flags to remember for quick audits.
Free HTTP header checker on VSPIC.

What is http header checker?

HTTP headers are key-value metadata on requests/responses — they control caching, auth, security policy, and content type.

Security headers reduce XSS, clickjacking, and downgrade attacks when configured correctly.

Set-Cookie attributes (Secure, HttpOnly, SameSite) matter for session safety.

Some headers are stripped by browsers from JS — server-side fetch tools see more.

DevOps uses http header checker after CDN cutovers to confirm cache-control, HSTS, and CSP headers at the edge.

Missing security headers from header checker should become tickets — many fixes are one-line nginx or Cloudflare transforms.

API debugging benefits from header checker when CORS or content-type mismatches only appear on production URLs.