ES9+ (And ES11) require the use of User-Agent, while ES2+ not. Change-Id: Iffe64d82087940a82fbfa73bf5d2b7e864ae5d67
This way we can reuse it for other eSIM RSP HTTP interfaces like ES9+, ES11, ... Change-Id: I468041da40a88875e8df15b04d3ad508e06f16f7