Embedding Let's Encrypt CA root certificate into Qt application

embbeding_ca_cert_into_qt.cpp

#include <QtNetwork/QSslConfiguration>
#include <QtNetwork/QSslSocket>
#include <QtGlobal>
//more includes...

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

    //Adding CA root certificate of the Let'sEncrypt into default CA DB
    //for Qt 5.15+
#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
    qDebug() << "loading embedded \"ISRG Root X1\" CA cert:" 
      << QSslConfiguration::defaultConfiguration().addCaCertificates(":/ca_certs/isrg_root_x1.pem");
#else
    qDebug() << "loading embedded \"ISRG Root X1\" CA cert:"
      << QSslSocket::addDefaultCaCertificates(":/ca_certs/isrg_root_x1.pem");
#endif

    //more codes...
}