spdy per location

[Richard Kearsley]

Hi
I'm trying to set up spdy so that I can choose weather or not to use it 
based on the server location that's accessed
As I understand, the underlying protocol (http/https/spdy) is 
established first before any request can be sent (e.g. before we know 
which location it will match)

I know this example is totally impossible, but would like to know if 
there is a real way of doing it:

server
{
     listen 80;
     listen 443 ssl spdy;

     location /
     {
         spdy off;
         blah;
     }

     location /spdy
     {
         spdy on;
         blah;
     }
}

Many thanks