GWS is Google's own web server implementation which lives behind closed doors.
https://en.wikipedia.org/wiki/Google_Web_Server
Web Servers
Get access to data on 162,366 websites Google Web Server Customers. We know of 18,496 live websites using Google Web Server and an additional 143,870 sites that used Google Web Server historically and 11,142 websites in the United States.
Get a list of 162,366 websites using Google Web Server which includes location information, hosting data, contact details, 18,496 currently live websites and an additional 406,058 domains that redirect to sites in this list. 143,870 sites that used this technology previouslyand 11,142 websites in the United States currently using Google Web Server.
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