Callback service provides asynchronous communication from a service provider back to its client.
回调服务提供从服务提供者回到其客户机的异步通信。
Confidentiality is somewhat tricky in the asynchronous scenario, because the PKI techniques used in a one-to-one interaction between a client and service provider can't be applied.
保密性在异步场景中有些麻烦，因为不能应用pki技术中使用的客户端和服务提供者之间的一对一交互。
Asynchronous messaging is widely recognized as an effective communication channel in an SOA environment where the service provider and the consumer may be separated across the Internet.
异步消息传递被广泛认为是SOA环境中(此类环境中，服务提供者和使用者可能分布在Internet上的不同位置)一个有效的通信通道。
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