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Asynchronous Communication Advantages: Requests need not be targeted to specific server. Service need not be available when request is made. No blocking, so resources could be freed. Could use connectionless protocol Disadvantages: Response times are unpredictable. Error handling usually more complex. Usually requires connection-oriented protocol. Harder to design apps Synchronous Communication Advantages: Easy to program Outcome is known immediately Error recovery easier (usually) Better real-time response (usually) Disadvantages: Service must be up and ready. Requestor blocks, held resources are “tied up”. Usually requires connection-oriented protocol
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