Next protocols supported are strictly NPN only. If you want to check ALPN support for a specific connection type you can use the following command:<p><pre><code>  openssl s_client -alpn h2 -connect news.ycombinator.com:443
</code></pre>
Near the end of the output you&#x27;ll see the ALPN protocol or `No ALPN negotiated`. I haven&#x27;t managed to get a list of server-supported protocols so far, not sure if that&#x27;s even possible with ALPN.<p>This is with LibreSSL 2.3, but I expect OpenSSL 1.0.2 to support it too.