HTTP Header Parser & Security Auditor
Inspect and validate your HTTP request and response headers. Automatically grades security posture, audits compliance, and generates copy-paste setup configs for your servers.
Raw Headers
HTTP Response headers will be analyzed against 5 key security standards.
Headers will be mapped, categorized, and inspected here.
Why Security Headers Matter
Modern web browsers enforce advanced security restrictions based on the instruction headers sent by your server. Deploying the correct security headers dramatically reduces a website's attack surface:
- ✔ Cross-Site Scripting (XSS) Prevention — `Content-Security-Policy` limits which script execution sources are allowed, stopping execution of injected malicious payloads.
- ✔ Clickjacking Protection — `X-Frame-Options` and CSP `frame-ancestors` prohibit unauthorized iframe embeddings, preventing hackers from overlaying transparent interaction traps.
- ✔ SSL/TLS Enforcement — `Strict-Transport-Security` guarantees that browsers never issue unencrypted HTTP requests to your domain, eliminating SSL-stripping vectors.
- ✔ MIME Sniffing Block — `X-Content-Type-Options: nosniff` forces browsers to strict adherence to defined Content-Types, safeguarding uploaded user images from parsing as scripts.
Security Header Cheat Sheet
Instead of loose wildcards, use default-src 'self' and specify verified hosts for stylesheets, scripts, and API assets.
Always couple cookies with Secure, HttpOnly, and SameSite=Lax (or Strict) to secure them against session hijacking.
Disable signatures in server settings to hide headers like Server: Apache/2.4.41 or X-Powered-By: PHP to avoid scanning of vulnerable server versions.
Frequently Asked Questions
What is an HTTP Header Parser & Auditor?
An HTTP Header Parser & Auditor is a client-side developer utility that breaks down raw HTTP response or request headers into readable key-value pairs, categorizes them, and runs compliance audits on critical security headers like CSP, HSTS, and X-Frame-Options to evaluate your website's defensive posture.
Why are HTTP security headers important?
HTTP security headers instruct the browser on how to handle the website's content and connections. They help mitigate severe web vulnerabilities such as Cross-Site Scripting (XSS), Clickjacking, MIME-sniffing, and MITM attacks by restricting browser behaviors and enforcing secure connections.
How do I fix a missing Content-Security-Policy (CSP) header?
You can implement a CSP by configuring your web server (e.g., Nginx, Apache, or Cloudflare) to return the "Content-Security-Policy" HTTP header with directives tailored to your application (such as "default-src 'self'"). Server headers are preferred for comprehensive security coverage.
What is the recommended configuration for the Strict-Transport-Security (HSTS) header?
The industry-standard recommendation for production environments is "Strict-Transport-Security: max-age=63072000; includeSubDomains; preload". This forces browsers to connect exclusively via HTTPS for two years, covers all subdomains, and qualifies the domain for inclusion in browser HSTS preload lists.
Does this tool upload or store my header data?
No. Just like other FlowStack web utilities, the entire parsing and auditing engine runs 100% client-side inside your local browser. Your headers, cookies, and system details are never sent to any server, ensuring complete security and data privacy.