Messaging Pattern - SOAP

SOAP

The term "Message Exchange Pattern" has a specific meaning within the SOAP protocol. SOAP MEP types include:

  1. 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.
  2. 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.
  3. 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.
  4. In Optional-Out: A standard two-way message exchange where the provider's response is optional.
  5. Out-Only: The reverse of In-Only. It primarily supports event notification. It cannot trigger a fault message.
  6. Robust Out-Only: similar to the out-only pattern, except it can trigger a fault message. The outbound message initiates the transmission.
  7. Out-In: The reverse of In-Out. The provider transmits the request and initiates the exchange.
  8. Out-Optional-In: The reverse of In-Optional-Out. The service produces an outbound message. The incoming message is optional ("Optional-in").

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