curl --include \
>      --no-buffer \
>      --header "Connection: Upgrade" \
>      --header "Upgrade: websocket" \
>      --header "Host: localhost:4203" \
>      --header "Origin: http://localhost:4203" \
>      --header "Sec-WebSocket-Key: SGVsbG8sIHdvcmxkIQ==" \
>      --header "Sec-WebSocket-Version: 13" \
>      --user "#xx:xxxxxx"\
>      http://localhost:4203
HTTP/1.1 400 Bad Request
Content-type: text/plain
Date: Sun Dec 15 03:40:48 2019
Exec: Error - Empty String
Return: <NULL>