WebSocketExtension

interface WebSocketExtension<ConfigType : Any>

WebSocket extension instance. This instance is created for each WebSocket request, for every installed extension by WebSocketExtensionFactory.

factory	`abstract val factory: WebSocketExtensionFactory<ConfigType, out WebSocketExtension<ConfigType>>` Reference to the WebSocketExtensionFactory, which produced this extension.
protocols	`abstract val protocols: List<WebSocketExtensionHeader>` List of WebSocket extension protocols which will be sent by client in headers. They are required to inform server that client wants to negotiate current extension.

clientNegotiation	`abstract fun clientNegotiation( negotiatedProtocols: List<WebSocketExtensionHeader> ): Boolean` This method is called only for a client, when it receives the WebSocket upgrade response.
processIncomingFrame	`abstract fun processIncomingFrame(frame: Frame): Frame` This method is called on each incoming frame before handling it in WebSocket session.
processOutgoingFrame	`abstract fun processOutgoingFrame(frame: Frame): Frame` This method is called on each outgoing frame and handle it before sending.
serverNegotiation	`abstract fun serverNegotiation( requestedProtocols: List<WebSocketExtensionHeader> ): List<WebSocketExtensionHeader>` This method is called only for a server, when it receives websocket session.

class WebSocketDeflateExtension : WebSocketExtension<Config>

Compress and decompress WebSocket frames to reduce amount of transferred bytes.