300b8c8262
requests-mock removed the old compatibility code in 1.12.0[1] and now usage of a bare dict for response header causes AttributeError. [1] https://github.com/jamielennox/requests-mock/commit/e3bd0d1a92e40fa9cb1d587c59157020a45de620 Closes-Bug: #2064011 Change-Id: Iee86fa3eae86102112987b8648ada73d37ac58e8