connect(&http, SIGNAL(error(QString)),
this, SLOT(downloadingError(QString)));
connect(&http, SIGNAL(progress(qint64,qint64)),
this, SLOT(updateDownloadProgress(qint64,qint64)));
connect(&http, SIGNAL(error(QString)),
this, SLOT(downloadingError(QString)));
connect(&http, SIGNAL(progress(qint64,qint64)),
this, SLOT(updateDownloadProgress(qint64,qint64)));