But HTTPS just adds TLS. You can use "some library" to do the TLS handshake and subsequent encryption, and end up with a readable-writable stream that you can t

But HTTPS just adds TLS. You can use "some library" to do the TLS handshake and subsequent encryption, and end up with a readable-writable stream that you can then parse HTTP from yourself. Your code is the same as when it was dealing with a TCP stream directly.