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 266,412 websites that are Alternate Protocol Customers. We know of 1,474 live websites using Alternate Protocol and an additional 264,938 sites that used Alternate Protocol historically and 318 websites in the United States.
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Get a list of 266,412 websites using Alternate Protocol which includes location information, hosting data, contact details, 1,474 currently live websites and an additional 12,252 domains that redirect to sites in this list. 264,938 sites that used this technology previouslyand 318 websites in the United States currently using Alternate Protocol.
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