In software architecture, a messaging pattern is a network-oriented architectural pattern which describes how two different parts of a message passing system connect and communicate with each other.
In telecommunications, a message exchange pattern (MEP) describes the pattern of messages required by a communications protocol to establish or use a communication channel. There are two major message exchange patterns — a request-response pattern, and a one-way pattern. For example, the HTTP is a request-response pattern protocol, and the UDP has a one-way pattern.
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—Ruth Benedict (1887–1948)