An example: reliable delivery of a synchronous request.
一个示例：一个同步请求的可靠传递。
In Figure 3, the message flow makes a synchronous request.
在图3中，消息流发出了一个同步请求。
A synchronous request would immediately either return or throw a RequestException.
同步请求会立即返回或掷出RequestException。
Normally there is a request followed by a synchronous response.
通常情况下，总是先有一个请求，后有同步的响应。
Normally there is a request followed by a synchronous response.
通常情况下，总是先有一个请求，后有同步的响应。
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