Tools / Network
HTTP Headers Analyzer
Inspect HTTP response headers, security headers and redirect chain for any URL. Reads HTTP headers, the full redirect chain and security policies (HSTS, CSP, X-Frame-Options) in one request — ideal for SEO audits, CDN debugging and security hardening.
The hidden metadata layer of every request
HTTP headers are metadata key/value pairs exchanged between browser and server. Request headers (User-Agent, Accept, Cookie) tell the server who the client is and what it expects; response headers (Content-Type, Cache-Control, Set-Cookie) describe what the server returned and how the browser should handle it. This tool only reads the response headers and redirect chain — it never downloads the body.
Security headers are the backbone of a modern web stack. HSTS locks the browser into HTTPS, CSP blocks XSS, X-Frame-Options prevents clickjacking. Missing these headers leaves an open door for attackers. For enterprise hardening see our server security plans.
About HTTP headers
HSTS tells the browser "never reach this origin over plain HTTP again". After the first HTTPS visit, the browser auto-upgrades every request to HTTPS for the max-age duration, blocking SSL-stripping attacks. Recommended value: max-age=63072000; includeSubDomains; preload.
CSP whitelists which origins may load scripts, styles, images or iframes. It's the strongest defence against XSS — it blocks inline scripts and permits only approved domains. Safe inline scripts are supported via nonces or hashes.
CORS (Cross-Origin Resource Sharing) controls whether JavaScript on one origin may call an API on another. Access-Control-Allow-Origin lists which origins may access it, Access-Control-Allow-Methods which HTTP verbs are accepted. "Access-Control-Allow-Origin: *" is fine for public APIs but must never appear on authenticated endpoints.
X-Powered-By (and Server) headers leak the exact software and version your server runs (e.g. PHP/8.1.2, Express). Attackers use that info to target known CVEs. Disable it with app.disable("x-powered-by") in Express or server_tokens off; in nginx.
When should you use HTTP Headers Analyzer?
The KEYDAL HTTP Headers Analyzer tool is a browser-based utility that developers, system administrators, SEO specialists and enterprise technology teams use in their daily operations. It requires no installation, is free, and produces results instantly. It is designed so local teams can run audits without connecting to server environments and run analyses without touching production.
Typical scenarios include: post-migration verification, comparing domain or hosting providers, diagnosing customer issues, security auditing (pre-pentest reconnaissance), root-cause analysis of email deliverability problems, validating CDN or proxy configuration, surfacing technical audit data for SEO teams, and rapid information gathering during incident response. You can copy results as text and share them or paste them into internal documentation.
The KEYDAL infrastructure team provides web hosting, VPS, dedicated server management, server hardening, DNS configuration and SSL/TLS deployment services from Türkiye. Beyond these tools, we deliver server setup and operations support across Hetzner, OVHcloud, Contabo, DigitalOcean and Turkish providers.
Your queries are never stored on our servers
KEYDAL tools run stateless: domain names, IPs, URLs or other inputs are not persisted to any database. Logs are kept only for security purposes (rate limiting, abuse detection) and deleted within 30 days. For tools that handle sensitive data (tokens, API keys, JWTs), processing happens entirely in your browser — nothing is sent over the network. See our Privacy Policy for details.
All tools run over HTTPS with TLS 1.3 support. KEYDAL is a Türkiye-based technology company and complies fully with local data-protection regulations (KVKK) and GDPR principles.
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The KEYDAL free tools collection includes DNS lookup, WHOIS lookup, SSL certificate checker, HTTP headers analyzer, IP geolocation, uptime checker, JSON formatter, JWT decoder, Base64 encode/decode, QR code generator, meta tag analyzer and robots.txt tester. All browser-based, free, no installation.
If you are comparing server prices, see our web hosting, VPS, VDS, cloud hosting, dedicated server and storage pages. See all tools →