GFE server response reportedly stands for Google Front End.
https://google.com
Frameworks
Get access to data on 103,913 websites that are Google Front End Customers. We know of 9,276 live websites using Google Front End and an additional 94,637 sites that used Google Front End historically and 6,267 websites in the United States.
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Get a list of 103,913 websites using Google Front End which includes location information, hosting data, contact details, 9,276 currently live websites and an additional 352,946 domains that redirect to sites in this list. 94,637 sites that used this technology previouslyand 6,267 websites in the United States currently using Google Front End.
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