Check if HTTP/2 enabled using curl
To see if a web site have HTTP/2 enabled, you can run
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curl -sI SITE_URL_HERE -o /dev/null -w '%{http_version}\n' |
If you see 2, the site have HTTP/2 enabled.
Example
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boby@sok-01:~$ curl -sI https://serverok.in/ -o /dev/null -w '%{http_version}\n' 2 boby@sok-01:~$ |
Here is a site with no HTTP/2
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boby@sok-01:~$ curl -sI http://ok.serverok.in/ -o /dev/null -w '%{http_version}\n' 1.1 boby@sok-01:~$ |