HubConnection queryString

[msdn70]

Hi..
I Added the following constructor to HubConnection.java
public HubConnection(String url, Context context, ITransport transport, String queryString) {
super(url, context, transport, queryString);
setUrl(GetUrl(url, true));
setQueryString(queryString);
}

to be able adding queryString while initializing my connection.

But the problem I got null in OnConnect event in Hub server side
public override Task OnConnected()
{
...
}
Why queryString value not showing?? any help?