// webpage.cpp
class Interceptor : public QWebEngineUrlResponseInterceptor {
public:
  void interceptResponseHeaders(QWebEngineUrlResponseInfo &info) override;
};

void Interceptor::interceptResponseHeaders(QWebEngineUrlResponseInfo &info) {
  // only modify headers for the main request
  if (info.requestUrl() != QUrl("https://www.qt.io/"))
    return;

  qDebug() << "Changing headers";
  auto headers = info.responseHeaders();
  headers.insert("x-foo", "foobar");
  headers.insert("content-security-policy", "f");
  headers.insert("content-type", "text/plain");
  info.setResponseHeaders(headers);
}

WebPage::WebPage(QWebEngineProfile *profile, QObject *parent)
    : QWebEnginePage(profile, parent) {
  connect(this, &QWebEnginePage::selectClientCertificate, this,
          &WebPage::handleSelectClientCertificate);
  connect(this, &QWebEnginePage::certificateError, this,
          &WebPage::handleCertificateError);
  setUrlResponseInterceptor(new Interceptor);
}