#include <QUrl>

int main(int /*argc*/, char* /*argv*/[])
{
    // With host address containing no IPv6 scopeId
    QUrl u("http://[::1]:8080");
    qDebug( "1. url: %s", qPrintable( u.toString()));     

    // With host address "::1%0" containing scopeId as
    // returned by QAbstractSocket::peerAddress() when
    // connecting with localhost IPv6.
    u = QUrl("http://[::1%0]:8080");
    qDebug( "2. url: %s", qPrintable( u.toString()));    
}

1. url: http://[::1]:8080
2. url: