The server advertises Alternate Protocol options, most probably providing SPDY support.
http://www.chromium.org/spdy/spdy-protocol/spdy-protocol-draft2
Operating Systems and Servers · Protocol
Get access to data on 381,517 websites that are Alternate Protocol Customers. We know of 3,217 live websites using Alternate Protocol and an additional 378,300 sites that used Alternate Protocol historically and 1,195 websites in the United States.
Get a list of 381,517 websites using Alternate Protocol which includes location information, hosting data, contact details, 3,217 currently live websites and an additional 5,894 domains that redirect to sites in this list. 378,300 sites that used this technology previously and 1,195 websites in the United States currently using Alternate Protocol.