If you have trouble with QWebView and SSL errors you can ignore SSL errors to render page correctly.

main.cpp

#include <QDebug>
#include <QWidget>
#include <QNetworkReply>
#include <QSslConfiguration>

App::App(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::App)
{
    ui->setupUi(this);

    QSslConfiguration sslCfg = QSslConfiguration::defaultConfiguration();
    QList<QSslCertificate> ca_list = sslCfg.caCertificates();
    QList<QSslCertificate> ca_new = QSslCertificate::fromData("CaCertificates");
    ca_list += ca_new;

    sslCfg.setCaCertificates(ca_list);
    sslCfg.setProtocol(QSsl::AnyProtocol);
    QSslConfiguration::setDefaultConfiguration(sslCfg);

    connect(ui->webView->page()->networkAccessManager(),
            SIGNAL(sslErrors(QNetworkReply*, const QList<QSslError> & )),
            this,
            SLOT(sslErrorHandler(QNetworkReply*, const QList<QSslError> & )));
}

void App::sslErrorHandler(QNetworkReply* qnr, const QList<QSslError> & errlist)
{
  #if DEBUG_ENABLED
  qDebug() << "---frmBuyIt::sslErrorHandler: ";
  // show list of all ssl errors
  foreach (QSslError err, errlist)
    qDebug() << "ssl error: " << err;
  #endif

  qnr->ignoreSslErrors();
}

is it works for some website like google.com ? ( they're force to use HTTPS )