Message Exchange Pattern Totally Explained

Everything about Message Exchange Pattern totally explained

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 TCP has a request-response pattern protocol, and the UDP has a one-way pattern. The term has a similar and specific meaning within the SOAP protocol. SOAP MEP types include:

In-Only: This is equivalent to one-way. A standard one-way messaging exchange where the consumer sends a message to the provider that provides only a status response.
Robust In-Only: This pattern is for reliable one-way message exchanges. The consumer initiates with a message to which the provider responds with status. If the response is a status, the exchange is complete, but if the response is a fault, the consumer must respond with a status.
In-Out: This is equivalent to request-response. A standard two-way message exchange where the consumer initiates with a message, the provider responds with a message or fault and the consumer responds with a status.
In Optional-Out: A standard two-way message exchange where the provider's response is optional.
Out-Only
Robust Out-Only
Out-In
Out-Optional-In

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