Asynchronous pluggable protocols offer three ways to map a protocol scheme to a class.
异步可插协议提供三种将协议方案映射到类的方式。
Pluggable protocols allow you to provide a new protocol handler that will be called for any requests that use the new protocol scheme.
可插协议允许你在新的协议方案基础上，提供能够被任何请求调用的新的协议处理程序。
A pluggable MIME filter is essentially an asynchronous pluggable protocol handler that implements an IInternetProtocolSink interface.
一个可插的MIME过滤器本质上只是一个实现了 IInternetProtocolSink接口的异步可插处理器。
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