Can I create a site like bt.cn where I can apply for an SSL certificate and automatically create https?
It is recommended to try WDCP. This way you can create your own SSL certificate. However, not all certificates are recognized by this thing, and SSL is not so friendly. If you want to embed HTTP in it, it will be a bit troublesome. , it is said all over the internet that you can use JS to nest, but in fact it is not that cool, so it is not necessary, and it is not recommended to use SSL