Online HTTP Cache Checker

This tool shows how web browsers will cache a URL. HTTP caching reuses previously loaded resources and can greatly impact performance. Learn more about HTTP Caching.

Test Your HTTP Cache Headers

Enter the URL of a webpage, image, script, font, or any other file to see the relevant caching headers returned from the server or CDN.

Enter a URL to get started!

Monitoring where it matters.

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Sloth riding the rocket.
Request Metrics is drop-in application monitoring where it matters most: the end user experience. From API Observability to User Sessions, developers can see the problems that matter to users, fix them faster, and continuously improve their applications. Request Metrics provides software observability in minutes instead of months for companies worldwide like eBay, Virgin Mobile, and Aljazeera.