How can I capture raw HTTP headers to paste into this analyzer?

Open your browser Developer Tools (F12), select a network request, view Response Headers in raw format, or run curl -I https://example.com in a terminal.

Are authorization tokens or cookies in my pasted headers sent to a server?

No. Parsing and security analysis happen completely client-side in your browser, though redacting live secrets before sharing screenshots is always recommended.

Does the tool support HTTP/1.1 and HTTP/2 pseudo-headers?

Yes, it parses status lines, standard RFC header fields, case-insensitive HTTP/2 lowercase headers, and multiple Set-Cookie lines.

Why does the analyzer warn about Server or X-Powered-By headers?

Exposing exact web server or framework version numbers helps automated scanners fingerprint known vulnerabilities, so suppressing version banners is a hardening best practice.

Can it analyze multiple Set-Cookie headers in a single response?

Yes, repeated header names like Set-Cookie are preserved and inspected individually for security flags.

HTTP Header Analyzer

Parse, inspect, and analyze raw HTTP request/response headers for security flags and caching.

About HTTP Header Analyzer

The HTTP Header Analyzer by ToolTux is an interactive diagnostic and web security inspection tool for backend engineers, frontend developers, DevOps teams, and security auditors. Every HTTP request and server response carries critical metadata headers governing browser caching, cross-origin resource sharing (CORS), content negotiation, compression, authentication cookies, and transport security. Misconfigured or conflicting headers frequently cause subtle production bugs—such as stale CDN caches, blocked API preflight requests, leaked server version banners, or session cookies missing Secure, HttpOnly, and SameSite attributes. With this utility, you can paste raw HTTP request or response header blocks captured from browser DevTools, curl -I output, proxy logs, or API gateways to parse every key-value directive into a clean, categorized breakdown. The analyzer explains standard headers in plain language, flags insecure or deprecated directives, highlights missing cookie protection flags, and audits caching behavior so you can troubleshoot issues rapidly. Because raw header captures are parsed directly in your browser, internal staging hostnames, session identifiers, and authorization headers remain strictly private on your local machine.

Examine raw HTTP headers for security best practices, cookie flags (HttpOnly, Secure, SameSite), and server information.

How to Use HTTP Header Analyzer

Copy raw HTTP response or request headers from your browser Network tab, curl -I terminal output, or API debugging tool.
Paste the multi-line header text directly into the HTTP Header Analyzer input editor.
Click Analyze (or view live parsing) to break the raw block into structured categories such as Security, Caching, CORS, Cookies, and General.
Inspect warning badges and recommendations for missing security flags, permissive CORS wildcards, or verbose server version headers.
Copy the parsed summary or refine your web server and CDN configuration based on the diagnostic findings.

Common Use Cases

Auditing Set-Cookie headers to verify that session cookies enforce Secure, HttpOnly, and appropriate SameSite attributes.
Troubleshooting Cache-Control, ETag, Vary, and CDN age headers when diagnosing stale assets or unexpected cache misses.
Debugging Access-Control-Allow-Origin and preflight CORS response headers across microservice and single-page app deployments.

Frequently Asked Questions

How can I capture raw HTTP headers to paste into this analyzer?: Open your browser Developer Tools (F12), select a network request, view Response Headers in raw format, or run curl -I https://example.com in a terminal.
Are authorization tokens or cookies in my pasted headers sent to a server?: No. Parsing and security analysis happen completely client-side in your browser, though redacting live secrets before sharing screenshots is always recommended.
Does the tool support HTTP/1.1 and HTTP/2 pseudo-headers?: Yes, it parses status lines, standard RFC header fields, case-insensitive HTTP/2 lowercase headers, and multiple Set-Cookie lines.
Why does the analyzer warn about Server or X-Powered-By headers?: Exposing exact web server or framework version numbers helps automated scanners fingerprint known vulnerabilities, so suppressing version banners is a hardening best practice.
Can it analyze multiple Set-Cookie headers in a single response?: Yes, repeated header names like Set-Cookie are preserved and inspected individually for security flags.

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