One thing is missing from that list: how to test for ALPN support (or the lack thereof). The OpenSSL client just lists the next protocols supported, but no mention if that&#x27;s NPN or ALPN.<p>This is one of those details that I believe are the real roadblocks to HTTP&#x2F;2.0 support. Google is trying to drive adoption by deprecating old features like NPN from Chrome, but people setting their servers up with HTTP&#x2F;2.0 don&#x27;t even know about these details or how it affects them.