Introduction to One Request, One of Two Possible Responses
In an interaction using one request and one of two possible responses, the client sends a single request to a service and receives one of two possible responses. For example, the request can be to order a product online, and the first response can be either an in-stock message or an out-of-stock message. Figure 5-7 provides an overview.
Figure 5-7 One Request, One of Two Possible Responses

Description of "Figure 5-7 One Request, One of Two Possible Responses"