HTTP Headers Viewer

Request & Response Metadata Inspector

Detecting your browser headers...

Header	Value

Target URL

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Ready for Analysis

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Header	Value

Error

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Security Audit

Instantly check for critical security headers like CSP, HSTS, and X-Frame-Options to ensure your site is protected.

Caching Insight

Analyze Cache-Control and Expires headers to understand how browsers and CDNs manage your content's freshness.

Dev Tooling

View your browser's own Request headers to debug authentication tokens, user-agent strings, and language preferences.

Server Topology

Identify the web server software and potential load balancers or proxy servers handling the request.

Understanding HTTP Headers

HTTP headers are the hidden metadata exchanged during every conversation between a web browser (client) and a web server. They provide essential context about the request or response, such as content type, caching instructions, security policies, and server identification.

Understanding these headers is crucial for debugging connectivity issues, verifying security configurations, or simply optimizing website performance.

Key Takeaways

Request vs. Response: Request headers are sent by the browser; Response headers are sent back by the server.
Security: Always ensure Strict-Transport-Security is present to enforce HTTPS.
User-Agent: This header tells the server which browser and operating system you are using.