从浏览器的角度来看，信息像是来自同一个域，但实际上，内容请求是由代理代表客户机发出的。
From the browser's perspective, the information appears to come from the same domain, but in reality, the content request is made by the proxy on behalf of the client.
通常，将所有这些逻辑置于客户机代理，客户机代理代表客户机应用程序中的Web服务。
Typically, all this logic is placed in a client proxy, which represents the Web service in your client application.
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