您也可以决定异步发送回一个消息，建立一个双向通信。
You can also decide to send a message back asynchronously establishing a two-way communication.
当此worker完成其作业后，它会向主线程发送回一个消息。
When the worker finishes its work, it will send a message back to the main thread.
在第一行粗体代码中，OpenIdLoginPage发送回一个成功的响应。
In the first bold line, OpenIdLoginPage sends back a successful request.
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