HTTP Header Viewer
Inspect HTTP response headers for any URL
What are HTTP Headers?
HTTP headers are key-value metadata pairs sent with every HTTP request and response that control how browsers, CDNs and servers handle content. A response header like Content-Type: text/html; charset=utf-8 tells the browser how to render, Cache-Control: max-age=3600 controls CDN caching, Strict-Transport-Security: max-age=31536000 enforces HTTPS, and Content-Security-Policy: default-src 'self' blocks XSS. Request headers like Authorization: Bearer, User-Agent and Cookie identify the client. NETCUE's HTTP Header Viewer fetches and displays these headers for any URL so you can audit security (X-Frame-Options, CSP), caching, compression and server fingerprints before deploying EdgeCue captive portals or debugging why a portal page is not cached in the UAE. Common debugging uses include verifying that EdgeCue captive portal splash pages return Cache-Control: no-store to prevent caching, confirming that your UAE-hosted API returns correct CORS headers, and checking that nginx or Cloudflare adds expected security headers. All checks run client-side in your browser and results can be copied for ticketing or compliance documentation.
How to Use This Tool
- Enter your input — Provide the value required by HTTP Header Viewer (e.g., IP, domain, text) in the input field above.
- Configure options — Adjust any settings such as CIDR, key length, or format if the tool provides them.
- Click Calculate/Generate — Results appear instantly in the results panel below.
- Copy or export — Use Copy All or Download (CSV/PDF) to save results. All processing stays in your browser.
Understanding the Results
Output format: Inspect HTTP response headers for any URL. Results are shown with clear labels and can be copied for documentation, ticketing, or IPAM systems.
Accuracy: Calculations follow current RFCs and browser-native crypto where applicable. For DNS/WHOIS lookups, results reflect live network responses at query time.
Tips & Best Practices
• Keep inputs in correct format (e.g., valid IPv4 like 192.168.1.1, valid domain like example.com) to avoid validation errors.
• Bookmark this tool and try related tools: Developer Tools utilities are linked below as Related Tools.
• All NETCUE tools run client-side — no data leaves your browser. For sensitive data, you can use them offline after first load.
Frequently Asked Questions
Headers control caching behavior, security policies, content negotiation, and provide debugging information.
Yes — every NETCUE tool, including HTTP Header Viewer, is free, requires no login, and runs entirely in your browser. No input is sent to any server.
No. HTTP Header Viewer processes everything locally via JavaScript. Closing the tab clears the in-memory input. We do not log, store or transmit your data.
Inspect HTTP response headers for any URL — built for network engineers and developers, with instant results, copy/export, and related developer tools tools one click away.
Yes. After the page loads once, it works offline (service worker cache) and is fully responsive on mobile. Inputs stay 16px to avoid iOS zoom.