check HTTP2 compatibility

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How to test HTTP/2 via command line?



Get the latest cURL release and use this command: curl --http2.

With the latest version of OpenSSL installed on servers, however, it’s possible to check hosts for HTTP/2 support from the command line: 

 $ echo | openssl s_client -alpn h2 -connect google.com:443 | grep ALPN 
ALPN protocol: h2 DONE 

 A web-based tool from KeyCDN https://tools.keycdn.com/http2-test

and the is-http2 package can also help determine host support. 


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