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    Type:Task 
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    Resolution: Fixed
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    Priority:L3 - Default 
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    Affects Version/s: None
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    Component/s: backend
Context:
To make the integration of the CloudEvents ingestion API easier we decided to also support the plain json content type.
AT:
- besides the specific json content type requested by the cloudEvents api `application/cloudevents-batch+json`, plain `application/json` is also accepted
- the supported content-type header values are documented on the ingestion rest api