HTTP Header Diff Checker – Compare Response Headers Between Two URLs
HTTP Header Diff Checker
The HTTP Header Diff Checker is a fast, browser-based tool that lets IT professionals compare the HTTP response headers from two different URLs. This is incredibly helpful for spotting differences in server configuration, caching headers, CORS settings, redirection behavior, or security features between environments.
Just enter two fully qualified URLs like https://example.com and https://staging.example.com and instantly visualize the differences in their server responses. This information is critical when troubleshooting CDN issues, diagnosing reverse proxy behavior, or auditing for security headers such as Strict-Transport-Security, X-Content-Type-Options, and Content-Security-Policy.
Learn more about HTTP headers on MDN, or read about known header fields on Wikipedia.
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