Chrome will deprecate SPDY & NPN in early 2016 and will be replaced by HTTP/2 protocol.
http://blog.chromium.org/2015/02/hello-http2-goodbye-spdy-http-is_9.html
http://blog.chromium.org/2015/02/hello-http2-goodbye-spdy-http-is_9.html
Google to deprecate SPDY
- Thread starter WoodiE
- Start date
Prediction: SPDY removal will be postponed either indefinitely or multiple times as the date draws near.
Already noticed my SPDY indicator showing http/2 on GMail, so now the question is where is the support guides for the servers 
yup SPDY is gone now in Chrome 51 https://community.centminmod.com/posts/31523/ 
No SPDY on my site with Chrome 51, just HTTP/2. Wonder how long it will take for my users to upgrade their browsers 
Vast majority already did.No SPDY on my site with Chrome 51, just HTTP/2. Wonder how long it will take for my users to upgrade their browsers
All browsers today are updated automatically, except for old IE. So only users with Windows 7 or older version that use IE don't have support for HTTP/2
