This is typically used for synchronous request-response message exchanges.
这通常用于同步请求-响应消息交换。
When you think about implementing Web services with SOAP, you probably have synchronous request-response-style operations in mind.
当您希望通过SOAP实现Web服务时，您脑子里想到的很可能就是请求响应模式的同步操作。
Basic callback - The basic callback scenario combines two synchronous request-response scenarios to enable asynchronous processing.
基本回调——基本回调场景由两个同步请求？响应场景组成，以便能够进行异步处理。
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