这个问题实际上无论哪个端点(一个或两个)不在控制之内都会遇到，但这里特别需要注意。
This is really an issue when any endpoint is out of your control (one or both), but bears mentioning here.
该问题的核心部分是控制可以调用的应用程序或端点。
An essential part of this is controlling the applications, or endpoints, which can be invoked.
如果只能控制一个端点，实际上问题比第一眼看起来更加微妙一些。
When you control one endpoint but not the other, the problems are actually a little more subtle than you might at first think.
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