扩展处理程序链在接收RRD请求时执行，方法是调用每个与附加到 RRD 请求的某些扩展数据匹配的扩展处理程序。
The extension handler chain is executed upon receiving a RRD request by calling each extension handler that matches some extension data that is attached to the RRD request.
RRD提供了灵活的机制，允许应用程序通过附加自定义数据来扩展RRD请求，从而使应用程序能够将特定的应用程序上下文传递到远程系统。
RRD provides a flexible mechanism that lets applications extend the RRD request by attaching custom data, enabling applications to pass specific application context to the remote system.
引入了具有附加请求参数的缓存标识，以便简化应用程序版本缓存。
Cache identification has been introduced with additional request parameters to facilitate application version caching.
若要请求身份验证，发送应用程序必须设置要进行身份验证的消息的身份验证级别，并且将安全证书附加到消息。
To request authentication, the sending application must set the authentication level of the message to be authenticated and attach a security certificate to the message.
若要请求身份验证，发送应用程序必须设置要进行身份验证的消息的身份验证级别，并且将安全证书附加到消息。
To request authentication, the sending application must set the authentication level of the message to be authenticated and attach a security certificate to the message.
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