QT WSS SERVER下层协商没有发送中间证书

http://doc.qt.io/qt-5/qtwebsockets-sslechoserver-example.html
使用QT官方提供的示例写的WSS服务器时，android手机无法连接，原因是下层握手时QT服务器没有发送中间证书给手机，而只发了一个证书，同样的证书用NGINX就没有问题，因为NGINX发送了两个证书，我也不知道这是不是QT的BUG，如果不是应该怎么设置支持android手机连接呢？

http://doc.qt.io/qt-5/qtwebsockets-sslechoserver-example.html
When using the WSS server that QT officially provided, the Android phone is unable to connect, because the QT server does not send a intermediate certificate to the phone when the lower handshake is handshaking, but only a certificate is sent, and the same certificate has no problem with NGINX, because NGINX sends two certificates, and I do not know if this is the BUG of QT, if I do not know if it is the BUG of QT. How should we set up Android mobile connections?