main.cpp

...

    QSharedPointer<QGuiApplication> app(SailfishApp::application(argc, argv));
    QSharedPointer<QQuickView> view(SailfishApp::createView());
    
...

    NetworkAccessManagerFactory* factory = new NetworkAccessManagerFactory;
    view->engine()->setNetworkAccessManagerFactory(factory);
    
...

networkaccessmanagerfactory.cpp

#include "networkaccessmanagerfactory.h"

QNetworkAccessManager *NetworkAccessManagerFactory::create(QObject *parent)
{
    m_networkManager = new QNetworkAccessManager(parent);
    connect(m_networkManager,SIGNAL(sslErrors(QNetworkReply*,QList<QSslError>)),this,SLOT(onIgnoreSSLErrors(QNetworkReply*,QList<QSslError>)));
    return m_networkManager;
}

void NetworkAccessManagerFactory::onIgnoreSSLErrors(QNetworkReply *reply, QList<QSslError> error)
{
  reply->ignoreSslErrors(error);
}

networkaccessmanagerfactory.h

#ifndef NETWORKACCESSMANAGERFACTORY_H
#define NETWORKACCESSMANAGERFACTORY_H

#include <QObject>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QQmlNetworkAccessManagerFactory>
#include <QSslError>

class NetworkAccessManagerFactory :  public QObject,public QQmlNetworkAccessManagerFactory
{
    Q_OBJECT
public:
    virtual QNetworkAccessManager *create(QObject *parent);

public slots:
   void onIgnoreSSLErrors(QNetworkReply* reply,QList<QSslError> error);

private:
   QNetworkAccessManager* m_networkManager;
};

#endif // NETWORKACCESSMANAGERFACTORY_H

page.qml

import QtQuick 2.0
import Sailfish.Silica 1.0



Page {
    id: page
    SilicaListView {
        id: listView

        anchors.fill: parent

        header: PageHeader {
            title: qsTr("Artists")
        }
        Image {
            width: 100
            height: 100
            source: "https://www....png"
        }
    }
}