Test and observe protocol upgrades from HTTP/2 to HTTP/3

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Make Request

šŸ’” How HTTP/3 Upgrade Works

Browsers use opportunistic upgrade. The first request connects via HTTP/2 (TCP). The server sends an Alt-Svc header advertising HTTP/3 availability. Subsequent requests may use HTTP/3 (QUIC/UDP). Click multiple times to observe the upgrade!

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Latest Result

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