HTTP Header Inspector - View Response Headers from Any Domain
Audit and analyze HTTP response headers against modern OWASP web security standards. Validate critical client-side shielding directives, inspect transmission configurations, and optimize server-side protection variables to block XSS, clickjacking, and mime-sniffing exploits.
✓ 100% Free & Unlimited✓ 100% Browser Local & Private✓ No Registration Required
How to use HTTP Header Security Auditor Online
Step 1: Paste your raw server HTTP response headers or cURL output strings directly into the workspace.
Step 2: Review the dynamically parsed audit scorecard, detailing active security headers alongside missing or weakly configured elements.
Step 3: Follow the concrete server configuration recommendations (Apache, Nginx, or Express) to deploy standard web security mitigations.
Frequently Asked Questions
What are the most critical HTTP security headers for modern web servers?
The most essential security headers include: Content-Security-Policy (CSP) to mitigate cross-site scripting (XSS), Strict-Transport-Security (HSTS) to enforce encrypted HTTPS connections, X-Frame-Options to block clickjacking, X-Content-Type-Options to prevent MIME-sniffing, and Referrer-Policy to control metadata sharing.
How does a Content Security Policy (CSP) protect a web application?
A CSP defines a strict allowlist of trusted domains and sources for stylesheets, scripts, images, and fonts. By preventing the execution of arbitrary, unsanitized external scripts, it acts as a robust wall against malicious script injections and clickjacking.
Are my private domain names or header configurations secure?
Yes. This tool runs entirely in-browser. All response headers are parsed, analyzed, and evaluated on-the-fly using secure local script routines. Your configurations and domain structures remain completely secure and private.