Get the ID of this request.
If the ID is not of type long, it needs to be specified; if uncertain of the underlying type, use idType to query for it.
There is no ID for notifications.
T = The type of the ID; the default type is long, but JSON-RPC allows IDs to also be string or typeof(null).
IncorrectType if the underlying type of the ID is not the requested type.
IncorrectType if this request is a notification.
idType
See Implementation
Get the ID of this request.
If the ID is not of type long, it needs to be specified; if uncertain of the underlying type, use idType to query for it.
There is no ID for notifications.