HTTP/2 is based on SPDY: http://en.wikipedia.org/wiki/HTTP/2#Genesis_in_and_later_differences_from_SPDY http://en.wikipedia.org/wiki/HTTP/2#Genesis_in_and

HTTP/2 is based on SPDY: http://en.wikipedia.org/wiki/HTTP/2#Genesis_in_and_later_differences_from_SPDY http://en.wikipedia.org/wiki/HTTP/2#Genesis_in_and_later_dif... So if they leave SPDY in place along with HTTP 2.0, they could wind up with strange incompatibilities occurring or site operators feeling like they need to support both SPDY and the HTTP 2.0 standard (rather than just the HTTP 2.0 standard). Looking at it, it actually seems more progressive to dump SPDY and move to the SPDY-based HTTP 2.0 at this stage. Then ten years down the road hopefully SPDY will be dead and there will just be HTTP/1.1 and HTTP/2.0.