Callback interface for receiving the response of an RPC call, regardless of the RPC mechanism.
@see MessageBuilder#createCall()
@see MessageBuilder#createCall(RemoteCallback,Class)
@see MessageBuilder#createCall(RemoteCallback,ErrorCallback,Class)
@see the Errai JAX-RS client module
@param < R> type of response the callback expects. Use {@link Void} for methods returning {@code void}.
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