DRBD supports a variation on each method that provides a bit more data protection than asynchronous at a slight cost in performance.

DRBD支持每种方法的变体，这些方法比异步模式提供更多的数据保护，代价是性能略有下降。

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Furthermore, there is quite a bit of boilerplate code involved in setting up an asynchronous call.

此外，在建立异步调用时还包括不少样板代码。

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Remember, we are assuming that the Credit History component takes a bit longer, so we first fire off an asynchronous request to get the History, and retrieve the response at a point later in time.

请记住，我们假定Credit History组件的处理时间会稍微长一些，因此首先将触发异步请求以获取History，并在稍后检索响应。

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