HTTP Header Viewer
Analyze website headers and server information
Request Configuration
Target Website
Request Options
Header Analysis
No analysis yet
Enter a website URL and click "Analyze Headers" to get started
When to Use HTTP Header Viewer
Website Debugging
Debug website issues by analyzing HTTP headers, response codes, and server configuration problems
Security Analysis
Check security headers like CSP, HSTS, and X-Frame-Options to assess website security posture
Performance Optimization
Analyze caching headers, compression settings, and server configuration for performance improvements
SEO Analysis
Check meta headers, canonical URLs, and redirect chains for SEO optimization and indexing issues
Learning & Research
Study HTTP protocols, server technologies, and web standards for educational purposes
API Testing
Test API endpoints, check CORS policies, and verify authentication headers for API development
Frequently Asked Questions
What are HTTP headers?
HTTP headers are key-value pairs sent between a client (browser) and server during HTTP requests and responses. They contain metadata about the request/response, including content type, server information, caching directives, security policies, and more. Headers help browsers and servers understand how to handle the data being transmitted.
How do I view HTTP headers of a website?
To view HTTP headers: 1) Enter the website URL in the input field, 2) Select the HTTP method (GET, HEAD, POST, etc.), 3) Click 'Analyze Headers' to fetch the headers, 4) View the detailed header information including status codes, server details, and response metadata. The tool handles CORS restrictions and provides comprehensive header analysis.
What information can I get from HTTP headers?
HTTP headers provide valuable information including: Server type and version, Content-Type and encoding, Caching policies, Security headers (CSP, HSTS), Cookie information, Redirect information, Compression settings, CORS policies, and Performance metrics. This data helps with debugging, security analysis, and performance optimization.
Why might I get CORS errors when viewing headers?
CORS (Cross-Origin Resource Sharing) errors occur when browsers block requests to different domains for security reasons. Our tool handles this by using server-side requests to fetch headers, bypassing browser CORS restrictions. If you encounter CORS issues, the tool will provide alternative methods or suggest using browser developer tools for direct analysis.
What are the most important HTTP headers to check?
Important headers include: Content-Type (file format), Content-Length (file size), Server (server software), Cache-Control (caching behavior), Set-Cookie (session management), Location (redirects), X-Frame-Options (clickjacking protection), Content-Security-Policy (XSS protection), Strict-Transport-Security (HTTPS enforcement), and Access-Control-Allow-Origin (CORS policy).
How can HTTP headers help with website debugging?
HTTP headers help debug issues by revealing: Server configuration problems, Caching issues (stale content), Security misconfigurations, Performance bottlenecks, Content delivery problems, Authentication failures, and Redirect loops. Analyzing headers is essential for troubleshooting website functionality, performance, and security issues.
What is the difference between request and response headers?
Request headers are sent by the client (browser) to the server and include information like User-Agent, Accept, Authorization, and Referer. Response headers are sent by the server back to the client and include Content-Type, Server, Set-Cookie, and Cache-Control. Our tool primarily focuses on response headers which reveal server behavior and configuration.
How accurate is the HTTP header viewer?
Our HTTP header viewer provides accurate results by making direct server-side requests to the target website, ensuring you get the actual headers returned by the server. The tool handles various HTTP methods, follows redirects, and provides comprehensive header analysis. Results are real-time and reflect the current server configuration.
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