| Package | Description | 
|---|---|
| io.netty.handler.codec.http.websocketx.extensions | Encoder, decoder, handshakers to handle
 WebSocket Extensions. | 
| io.netty.handler.codec.http.websocketx.extensions.compression | Encoder, decoder, handshakers to handle most common WebSocket Compression Extensions. | 
| Class and Description | 
|---|
| WebSocketClientExtension Created once the handshake phase is done. | 
| WebSocketClientExtensionHandshaker Handshakes a client extension with the server. | 
| WebSocketExtension Created once the handshake phase is done. | 
| WebSocketExtensionData A WebSocket Extension data from the Sec-WebSocket-Extensions header. | 
| WebSocketExtensionDecoder Convenient class for io.netty.handler.codec.http.websocketx.extensions.WebSocketExtension decoder. | 
| WebSocketExtensionEncoder Convenient class for io.netty.handler.codec.http.websocketx.extensions.WebSocketExtension encoder. | 
| WebSocketServerExtension Created once the handshake phase is done. | 
| WebSocketServerExtensionHandshaker Handshakes a client extension based on this server capabilities. | 
| Class and Description | 
|---|
| WebSocketClientExtension Created once the handshake phase is done. | 
| WebSocketClientExtensionHandler This handler negotiates and initializes the WebSocket Extensions. | 
| WebSocketClientExtensionHandshaker Handshakes a client extension with the server. | 
| WebSocketExtensionData A WebSocket Extension data from the Sec-WebSocket-Extensions header. | 
| WebSocketServerExtension Created once the handshake phase is done. | 
| WebSocketServerExtensionHandler This handler negotiates and initializes the WebSocket Extensions. | 
| WebSocketServerExtensionHandshaker Handshakes a client extension based on this server capabilities. | 
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