The server advertises Alternate Protocol options, most probably providing SPDY support.
https://www.chromium.org/spdy/spdy-protocol/spdy-protocol-draft2
Operating Systems and Servers
Get access to data on 270,585 websites that are Alternate Protocol Customers. We know of 1,512 live websites using Alternate Protocol and an additional 269,073 sites that used Alternate Protocol historically and 329 websites in the United States.
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Get a list of 270,585 websites using Alternate Protocol which includes location information, hosting data, contact details, 1,512 currently live websites and an additional 13,270 domains that redirect to sites in this list. 269,073 sites that used this technology previouslyand 329 websites in the United States currently using Alternate Protocol.
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