Qt 5.8 http2

[pavel25]

Hello,

I tried enabling http2 in my project using Qt 5.8 but when i actually execute a request the server still says it's still http 1.1.
Here is the test project i made.

#include <QGuiApplication>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QNetworkAccessManager>
#include <QDebug>
#include <QEventLoop>

int main(int argc, char *argv[])
{
   QCoreApplication app(argc, argv);

   QNetworkRequest req(QUrl("https://nghttp2.org/httpbin/headers"));
   req.setAttribute(QNetworkRequest::HTTP2AllowedAttribute, QVariant(true));

   QNetworkAccessManager manager;

   QNetworkReply* reply = manager.get(req);

   QEventLoop eventLoop;
   QObject::connect(reply, SIGNAL(finished()), &eventLoop, SLOT(quit()));
   eventLoop.exec();

   QList<QByteArray> reply_headers = reply->rawHeaderList();

   foreach(QByteArray head, reply_headers) {
       qDebug() << head << ":" << reply->rawHeader(head);
   }

   qDebug().noquote() << reply->readAll();

   return app.exec();
}

And here is the output i get (still http 1.1)

"Date" : "Tue, 21 Feb 2017 10:50:35 GMT"
"Content-Type" : "application/json"
"Content-Length" : "182"
"Access-Control-Allow-Origin" : "*"
"Access-Control-Allow-Credentials" : "true"
"X-Backend-Header-Rtt" : "0.002562"
"Strict-Transport-Security" : "max-age=31536000"
"Connection" : "close"
"Server" : "nghttpx nghttp2/1.20.0-DEV"
"Via" : "1.1 nghttpx"
"x-frame-options" : "SAMEORIGIN"
"x-xss-protection" : "1; mode=block"
"x-content-type-options" : "nosniff"
{
  "headers": {
    "Accept-Encoding": "gzip, deflate",
    "Accept-Language": "en-US,*",
    "Host": "nghttp2.org",
    "User-Agent": "Mozilla/5.0",
    "Via": "1.1 nghttpx"
  }
}

What am i doing wrong? Is there another flag i need to enable to make it work?

Thank you.