urlfetch/urlfetch.go
func Client(ctx context.Context) *http.Client {
	return &http.Client{
		Transport: &Transport{
			Context: ctx,
		},
	}
}
func Client(ctx context.Context) *http.Client {
	return &http.Client{
		Transport: &Transport{
			Context: ctx,
		},
	}
}
// Client returns an *http.Client using a default urlfetch Transport. This
// client will have the default deadline of 5 seconds, and will check the
// validity of SSL certificates.
//
// Any deadline of the provided context will be used for requests through this client;
// if the client does not have a deadline then a 5 second default is used.