Cannot set "Connection: close" in QNetworkRequest

I add

Code:

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m_request.setRawHeader("Connection", "close");

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but checking with Wireshark, I see that the header contains a "Keep-Alive".

I debugged Qt and seen that "network/access/qhttpnetworkconnection.cpp"
sets the Keep-Alive ignoring my header.

Code:

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void QHttpNetworkConnectionPrivate::prepareRequest(HttpMessagePair &messagePair)" 
...
if (networkProxy.type() == QNetworkProxy::HttpCachingProxy)  {
        value = request.headerField("proxy-connection");
        if (value.isEmpty())
            request.setHeaderField("Proxy-Connection", "Keep-Alive");
    } else {
#endif
        value = request.headerField("connection");
        if (value.isEmpty())
            request.setHeaderField("Connection", "Keep-Alive");
#ifndef QT_NO_NETWORKPROXY
    }

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Does someone know how to set a "Connection: close"?

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Added after 25 minutes:

It seems not possible:
https://bugreports.qt.io/browse/QTBUG-9463