HTTP Header Viewer
View HTTP request and response headers
HTTP Header Viewer
URL to Analyze
Tips:
- • You can enter URLs with or without the protocol (http/https)
- • The tool will follow redirects and show the redirect chain
- • Click any copy button to copy headers to your clipboard
- • Useful for debugging CORS, caching, security headers, and more
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Try Now JWT CreatorWhat is HTTP Header Viewer?
An HTTP Header Viewer is an essential web development tool that displays and analyzes HTTP headers exchanged between browsers and web servers. HTTP headers contain crucial metadata that controls how web requests and responses are processed, including content types, caching directives, security policies, authentication information, and server configurations. Our viewer fetches any URL and displays all request and response headers in an organized, readable format with categorization and analysis features. The tool is invaluable for web developers, security engineers, and system administrators who need to understand server behavior, debug web applications, verify security configurations, and optimize website performance. It provides insights into CORS policies, content encoding, cookie settings, redirect chains, and much more. Whether you're troubleshooting API integration issues, auditing security headers, or optimizing caching strategies, this viewer gives you complete visibility into the HTTP communication layer.
When to Use HTTP Header Viewer
Use our HTTP Header Viewer whenever you need to inspect web server responses, debug HTTP-related issues, or analyze website configurations. This tool is essential when troubleshooting CORS errors, investigating slow page loads, verifying security header implementations, or testing API endpoints. Web developers commonly use it when integrating third-party APIs, debugging authentication flows, optimizing caching strategies, or ensuring proper content type delivery. Security professionals rely on it for auditing web applications, checking for missing security headers, and verifying SSL/TLS configurations. It's particularly valuable when migrating websites, testing CDN configurations, investigating redirect loops, or analyzing competitor websites to understand their technical implementations. The tool is also useful for educational purposes when learning about HTTP protocols and web architecture.
How to Use HTTP Header Viewer
7 stepsEnter the URL you want to analyze in the input field
Click 'Analyze Headers' to fetch and display all HTTP headers
Review the request headers sent by the tool to the server
Examine the response headers returned by the server
Check the categorized view for security, caching, and content headers
Use the copy function to save specific headers for documentation
Analyze any issues or missing headers highlighted by the tool
Privacy & Security
100% SecureYour HTTP header analysis requests are made directly from your browser to the target servers. No URLs, header data, or analysis results are stored on our servers or transmitted through our systems. The tool acts as a client-side HTTP inspector, ensuring complete privacy for your web analysis activities. All header inspection and analysis happens locally in your browser.
Pro Tips
7 tipsUse this tool regularly to audit your own websites and ensure proper security header implementation
Compare headers from different environments (development, staging, production) to catch configuration issues
Look for missing security headers like CSP, HSTS, and X-Frame-Options that could leave your site vulnerable
Check that API endpoints return proper CORS headers for cross-origin requests
Verify that static assets have appropriate cache headers to optimize loading performance
Use the tool to understand how other websites implement security and performance optimizations
Document important header configurations for your team's reference and compliance requirements
Frequently Asked Questions
5 Q&AQ1:What are HTTP headers and why are they important?
HTTP headers are key-value pairs sent between web browsers and servers that contain metadata about requests and responses. They control caching, security, content types, authentication, and more. Understanding headers is crucial for debugging web issues, optimizing performance, and ensuring proper security configurations.
Q2:How can I use this tool to debug website issues?
Enter a URL to see all HTTP headers returned by that server. Look for missing security headers, incorrect content types, caching issues, or authentication problems. The tool categorizes headers to help you quickly identify potential issues with your web application or API.
Q3:What security headers should I look for?
Important security headers include Content-Security-Policy, X-Frame-Options, X-XSS-Protection, Strict-Transport-Security (HSTS), X-Content-Type-Options, and Referrer-Policy. Missing or misconfigured security headers can leave your website vulnerable to various attacks.
Q4:Can this tool help with API development and testing?
Yes, it's excellent for API development. You can inspect response headers to verify CORS settings, content types, rate limiting headers, authentication responses, and custom API headers. This helps ensure your API is configured correctly and follows best practices.
Q5:How do I interpret cache-related headers?
Cache headers like Cache-Control, ETag, Last-Modified, and Expires control how browsers and CDNs cache your content. Proper cache headers improve performance by reducing server requests, while incorrect settings can cause stale content or unnecessary server load.
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