GFE server response reportedly stands for Google Front End.
https://google.com
Frameworks
Get access to data on 102,792 websites that are Google Front End Customers. We know of 12,543 live websites using Google Front End and an additional 90,249 sites that used Google Front End historically and 8,264 websites in the United States.
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Get a list of 102,792 websites using Google Front End which includes location information, hosting data, contact details, 12,543 currently live websites and an additional 409,304 domains that redirect to sites in this list. 90,249 sites that used this technology previouslyand 8,264 websites in the United States currently using Google Front End.
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