Arduino Connection erro

[bluelemonade]

Hi,

I tried to connect a Arduino client to the ws server. I got

Demo exampe on WSCLient usgae
192.168.1.41
Connected
Get /hallo HTTP/1.1
Upgrade:websocket
Host 192.168.1.21
Sec-WebSocket-Key: eHicPCXz4rJMUscxik7BiWQ==
Sec-WebSocket-Version: 13

Handshak Failed.
Client Disconned.

can I configurate something to get a handshake?