HTTP/2 Protocol Tester

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Switching to HTTP/2 can significantly speed up resource loading and improve your technical SEO score.

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Inspect all details of an SSL certificate, including issuer, validity, and signature.

View all HTTP headers returned by a URL for debugging and security analysis.

Calculate the total download size of a webpage, including all assets like images and scripts.

Analyze which images on a page use lazy loading to defer off-screen resources.

Identify deprecated HTML elements that should be replaced with modern CSS or semantic HTML5.

Retrieve ownership details, registration dates, and registrar info for any domain.