这个类使用了一个 Zend_Http_Client 对象，该对象是与必要的用户身份认证信息一起提供的，用于打开一个到 Google Contacts 服务的已验证连接。
This class makes use of a Zend_Http_Client object, which is provided with the necessary user authentication information and used to open an authenticated connection to the Google Contacts service.
在失败的事件中，客户端应用一旦重新连接上服务器就可以恢复已订阅的数据。
In the event of a failure, client applications can recover the subscribed data once they reconnect to the server.
设置了代理管理器和一个或多个代理后，需要将工作台连接到代理管理器，以便其访问所有已连接的代理上的服务。
After you set up your agent manager and one or more agents, you need to connect your workbench to your agent manager to give it access to the services on all of the connected agents.
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