WebSocketServerExtensionHandshaker (Netty API Reference (5.0.0.Alpha4))

All Known Implementing Classes:

DeflateFrameServerExtensionHandshaker, PerMessageDeflateServerExtensionHandshaker
```
public interface WebSocketServerExtensionHandshaker
```
Handshakes a client extension based on this server capabilities.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`WebSocketServerExtension`	`handshakeExtension(WebSocketExtensionData extensionData)`	Handshake based on client request.

- Method Detail
  - handshakeExtension
```
WebSocketServerExtension handshakeExtension(WebSocketExtensionData extensionData)
```
    Handshake based on client request. It must failed with null if server cannot handle it.
    
    Parameters:
    
    extensionData - the extension configuration sent by the client.
    
    Returns:
    
    an initialized extension if handshake phase succeed or null if failed.