See bug https://bugs.launchpad.net/marconi/+bug/1284995 and patch https://review.openstack.org/#/c/83016
There is already default headers for the client. You can see them in marconi/tests/functional/helpers.py:create_marconi_headers. For the accept-header default value is 'application/json'.
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There is already default headers for the client. You can see them in marconi/ tests/functiona l/helpers. py:create_ marconi_ headers.
For the accept-header default value is 'application/json'.