An HTTP Header Analyzer is a diagnostic tool that examines the HTTP response headers sent by your web server, providing detailed analysis of security, performance, and configuration settings. It displays all response headers received, identifies missing critical security headers, analyzes caching configuration effectiveness, verifies compression settings, checks for information disclosure vulnerabilities, and provides recommendations for header optimization. HTTP headers are the invisible backbone of web communication, controlling everything from security policies to caching behavior. Every time a browser requests a page, your server responds with HTML content plus dozens of header fields that instruct the browser on how to handle that content. Security headers like Content-Security-Policy protect against XSS attacks, HSTS forces encrypted connections, and X-Frame-Options prevents clickjacking. Performance headers like Cache-Control dramatically reduce load times for returning visitors, while Content-Encoding ensures files are properly compressed. Our HTTP Header Analyzer performs comprehensive examination of your header configuration, testing for presence of essential security headers, analyzing caching effectiveness and expiration times, verifying compression and content-type headers, identifying information leakage (Server, X-Powered-By headers), and comparing your configuration against security best practices and industry standards. This tool is critical for security audits, helps optimize website performance through proper caching, ensures compliance with security standards, and identifies misconfigurations that could compromise security or performance.