In OSB,Message context consists of
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XML variables
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XML variables shared across the request flow.
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XML variables shared across response flow.
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XML variables shared across request and response flows.
The OSB message context is a shared XML-based storage that persists across both the request and response flows of a message processing pipeline. It's not limited to just request or just response - it's available throughout the entire message lifecycle in the proxy service.
In Oracle Service Bus (OSB), the message context is a set of XML variables that carry data as a message flows through a proxy service pipeline — and importantly, this context persists and is shared across both the request flow and the response flow of the same message exchange, letting variables set during the request be read or reused when handling the response.