// function.go package function import "net/http" func F(w http.ResponseWriter, r *http.Request) { w.Header().Set("Content-Type", "text/plain; charset=utf-8") w.Write([]byte(r.Header.Get("X-Forwarded-For"))) } HTTP functions can be reached without an additional API gateway layer—Cloud Functions gives you an HTTPS URL. After the function is deployed, you can invoke the function by entering the URL