enable SPDY by installing nginx 1.6 from the nginx PPA

conf/nginx-ssl.conf

@@ -40,7 +40,7 @@ keepalive_timeout   70;
 
 # Buffer size of 1400 bytes fits in one MTU.
 # nginx 1.5.9+ ONLY
-#ssl_buffer_size 1400; 
+ssl_buffer_size 1400; 
 
 # SPDY header compression (0 for none, 9 for slow/heavy compression). Preferred is 6. 
 # 

conf/nginx.conf

@@ -12,7 +12,7 @@ server {
 
 # The secure HTTPS server.
 server {
-	listen 443 ssl;
+	listen 443 ssl spdy;
 
 	server_name $HOSTNAME;