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 267,200 websites that are Alternate Protocol Customers. We know of 1,469 live websites using Alternate Protocol and an additional 265,731 sites that used Alternate Protocol historically and 320 websites in the United States.
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Get a list of 267,200 websites using Alternate Protocol which includes location information, hosting data, contact details, 1,469 currently live websites and an additional 11,092 domains that redirect to sites in this list. 265,731 sites that used this technology previouslyand 320 websites in the United States currently using Alternate Protocol.
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