SPDYcheck.org gives the thumbs up all round, with its only criticism being
Out-of-Date SPDY Protocol Support
The most recent version of SPDY is spdy/3. The highest version this website
supports is spdy/2. There are 3 major versions of SPDY. This website should
consider updating its software if possible to support spdy/3.
(Nginx 1.5.6, openSSL 1.0.1e - both latest versions I think, how could I get spdy/3 if I wanted it?)
But when I check it in my browser, through
chrome://net-internals/#events&q=type:SPDY_SESSION%20is:active
it doesn't show up. Other sites like google et al DO.
I also installed a chrome extension that puts a green lightning bolt in the address bar if SPDY is detected. Google = green bolt. My site = no green bolt.
I tried https://isspdyenabled.com/ to double-test my browser, and it told me that
This connection uses SPDY_VERSION: 3
So is the problem that my browser is refusing to use spdy/2 when it wants to use spdy/3 instead?
Or am I maybe using some cipher suite that is incompatible with SPDY, if that's even possible?