By default, a receiver requests the next message from the server in response to each fetch call, resulting in messages being sent to the receiver one at a time. As in the case of sending, it is often desirable to avoid this roundtrip for each message. This can be achieved by allowing the receiver to prefetch messages in anticipation of fetch calls being made. The receiver needs to be able to store these prefetched messages, the number it can hold is controlled by the receivers capacity.
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