# Package io.undertow.websockets.extensions

Interface Summary
ExtensionFunction: Base interface for WebSocket Extensions implementation.
ExtensionHandshake: Base interface for WebSocket Extension handshake.

Class Summary
CompositeExtensionFunction
NoopExtensionFunction
PerMessageDeflateFunction: Implementation of `permessage-deflate` WebSocket Extension.
PerMessageDeflateHandshake: Implementation of `permessage-deflate` WebSocket Extension handshake.