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11.6.3. Response Header
When using Hot Rod to access JBoss Data Grid, the contents of the response header consist of the following:
| Field Name | Data Type | Details |
|---|---|---|
| Magic | 1 byte | Indicates whether the header is a request or response header. |
| Message ID | vLong | Contains the message ID. This unique ID is used to pair the response with the original request. This allows Hot Rod clients to implement the protocol in an asynchronous manner. |
| Opcode | 1 byte | Contains the relevant operation code. In a response header, opcode can only contain the response operation codes. |
| Status | 1 byte | Contains a code that represents the status of the response. |
| Topology Change Marker | 1 byte | Contains a marker byte that indicates whether the response is included in the topology change information. |
