HTTP/2 Usage Checker
Checks whether the origin negotiates HTTP/2 (or HTTP/3) via ALPN.
What this tool checks
HTTP/2 or HTTP/3 supported
Checks whether the origin negotiates HTTP/2 (h2) via ALPN.
Why it matters: HTTP/2 multiplexes requests over one connection, removing head-of-line blocking and speeding up pages with many resources.
If it fails: Enable HTTP/2 (and ideally HTTP/3) on your server or CDN.
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