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 491,192 websites that are Alternate Protocol Customers. We know of 3,087 live websites using Alternate Protocol and an additional 488,105 sites that used Alternate Protocol historically and 1,140 websites in the United States.
Get a list of 491,192 websites using Alternate Protocol which includes location information, hosting data, contact details, 3,087 currently live websites and an additional 6,167 domains that redirect to sites in this list. 488,105 sites that used this technology previously and 1,140 websites in the United States currently using Alternate Protocol.