In other words, asynchrony enables all remote operations except for the processing of returned data by the federated server to proceed concurrently.

换句话说，异步使得联邦服务器的所有远程操作都可以并发地进行，只有对返回数据的处理除外。

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Since a resource cached by the edge server is returned in the next request, it is very important to make sure the cached data represents the correct content of that resource.

因为边缘服务器缓存的资源要在下一次请求时返回，一定要确保缓存的数据表示资源的正确内容。

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Firebug shows data sent to the server and the data returned by the server.

Firebug 显示发送到服务器的数据和从服务器返回的数据。

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