How to check if a website has HTTP/2 protocol support

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You can just check it in: Chrome Dev Tool (F12) → Network → Protocol.

It will tell you the protocol used and the domain of each transfer.

Chrome Dev Tool (F12) -> Network -> Protocol

Legend

http/1.1 = HTTP/1.1
h2          = HTTP/2

Note: If you cannot see the Protocol column, just right-click on any header and check the “Protocol” label.

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