GFE server response reportedly stands for Google Front End.
https://google.com
Frameworks
Get access to data on 103,727 websites that are Google Front End Customers. We know of 10,128 live websites using Google Front End and an additional 93,599 sites that used Google Front End historically and 6,909 websites in the United States.
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Get a list of 103,727 websites using Google Front End which includes location information, hosting data, contact details, 10,128 currently live websites and an additional 374,184 domains that redirect to sites in this list. 93,599 sites that used this technology previouslyand 6,909 websites in the United States currently using Google Front End.
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