At FOSDEM 2015 Daniel presented what the HTTP/2 protocol was going to become. It subsequently shipped to the world as RFC 7540, has been adopted by all major browsers, the most popular web servers and an ever growing number of sites. This is a recap of what the protocol is, what it means for browsers and sites and not the least how the adoption rate looks like now. What's the biggest obstacles in the way for turning on HTTP/2 on your site?