&gt; Many sites offer HTTP&#x2F;2 with NPN instead of ALPN right now.<p>According to <a href="https:&#x2F;&#x2F;blog.chromium.org&#x2F;2016&#x2F;02&#x2F;transitioning-from-spdy-to-http2.html" rel="nofollow">https:&#x2F;&#x2F;blog.chromium.org&#x2F;2016&#x2F;02&#x2F;transitioning-from-spdy-to...</a>, &quot;ALPN is already used 99% of the time to negotiate HTTP&#x2F;2 with Chrome&quot;.