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 269,516 websites that are Alternate Protocol Customers. We know of 1,453 live websites using Alternate Protocol and an additional 268,063 sites that used Alternate Protocol historically and 314 websites in the United States.
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Get a list of 269,516 websites using Alternate Protocol which includes location information, hosting data, contact details, 1,453 currently live websites and an additional 13,922 domains that redirect to sites in this list. 268,063 sites that used this technology previouslyand 314 websites in the United States currently using Alternate Protocol.
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