QWebSocketServer cannot handle IPv6 incoming connection

when example client use address like:

ws://[::1]:1234

ws://[::ffff:192.168.10.2]:1234

ws://[fe80::6b:52a1:f3c7:a16a]:1234

ws://[3ffe:ffff:7654:feda:1245:ba98:3210:4562]:1234

it is always caught

onError:  QAbstractSocket::RemoteHostClosedError

"The remote host closed the connection"

This happens in all the following examples:

Echo Client/Server Example

QML WebSocket Client/Server Example

SSL Echo Client/Server Example