RoutingMessage Class 
Routing message.
Constructor
RoutingMessage(*, body: str | None = None, app_properties: Dict[str, str] | None = None, system_properties: Dict[str, str] | None = None, **kwargs: Any)Keyword-Only Parameters
| Name | Description | 
|---|---|
| body | Body of routing message. Default value: None | 
| app_properties | App properties. Default value: None | 
| system_properties | System properties. Default value: None |