PS. Since you broached the subject of http2 and urging me to read up on it, It may interest you to know that all of the sites we host have been (nominally)supporting this for quite some time by virtue of the CDN provider we use. All the the sites we host are also SSL enabled, by virtue of the same CDN (no ssl cert required). I'm not under any delusions that the sites are "secure" as a result of this. We use them for the significant speed improvements it provides, and a *huge* reduction in bandwidth used by our servers. I dont know how many sites you host, but if it is more than half a dozen you will be doing youself and you clients a huge favour by considering doing the same. The perfomance benefits and bandwidth reduction (also less server load) alone could make this worthwhile for you, but as a fan of SSL just think of the headaches it could save ... the ability to provide your customers free SSL without you needing to do a single thing on your servers to make it happen. How cool is that?

Whats even cooler, as that fact that it even brings a degree of Authentication back into the picture, 'Cos unlike a shared SSL (still the most common implementation), the CDN provided SSL actually matches the domain names on which they are used. Can it really get any better?

I know I've mentioned the CDN we use several times over the last few years, but for those interested (including website owners, not just hosting providers) the CDN provider is "cloudflare" - costs nothing and can be setup and working in just a few minutes

.... From the same wiki that you probably read about http2.....

CloudFlare supports HTTP/2 using nginx with SPDY as a fallback for browsers without support, whilst maintaining all security and performance services.[73] CloudFlare are the first major CDN to support HTTP/2 Server Push.

Highly recommended. I have no other association with them other than being a very happy user.