| Interface | Description | 
|---|---|
| HttpUpgradeHandler | Interface between the HTTP upgrade process and the new protocol. | 
| ReadListener | Receives notification of read events when using non-blocking IO. | 
| WebConnection | The interface used by a  HttpUpgradeHandlerto interact with an upgraded
 HTTP connection. | 
| WriteListener | Receives notification of write events when using non-blocking IO. | 
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