title: How to detect if a server is using SPDY
body: <p>Any way to detect if a remote website supports SPDY and what version it is?</p>
  
  <p>Something I can use from the command line like a bash script.</p>
  
  <p>Tried sending custom User-Agent headers with curl but can't get any kind of response headers that would help me.</p>
  
  <p>The idea is to be able to get SPDY:true/false Version:3.1/3.0... for any domain.</p>