How do I know if my website is being served over HTTP or HTTP/2?
<p>Is there a command or a service that will tell me whether my websites are being served over HTTP or HTTP/2.</p>

<p>I found this tool: <a href="https://tools.keycdn.com/http2-test" rel="noreferrer">HTTP/2 Test | A simple HTTP/2.0 test tool</a>, but it only tells me whether my website supports HTTP/2, but not whether it is already using HTTP/2.</p>

<p>These is also this Chrome Extension: <a href="https://chrome.google.com/webstore/detail/http2-and-spdy-indicator/mpbpobfflnpcgagjijhmgnchggcjblin" rel="noreferrer">HTTP/2 and SPDY indicator</a>, which tells me that HTTP/2 is already enabled on my site, but as far as I know my version of Apache doesn't even support it.</p>

<p>Is there any way to know for sure? Thanks!</p>