MessageConsumer API missing callback to recieveMessage (for http)

[rbuckland]

The current implementation of mr4c provides a default HttpMessageHandler which provides plumbing to send messages to a registered topic URL.

This works, and sends topic messages to the remote URL.

HttpMessageHandler

There is currently no mechanism to receive any http messages via a same / similar route.

The API is there MessageConsumer for which you implement virtual void receiveMessage(const Message& msg)

However mr4c is missing a Http Message Handler for receiving messages, and sending them through to any registered MessageConsumers