How to communicate with ssl

Question

I've tried to send an http request on port 443 of site, it was complaining it's not communicating with ssl, so here are my questions: how to ask server for certificate, how it looks and how I should use it to encrypt message (and answer with encrypted message if I can't just use my encrypet request)

Answer 1

Here are the specs if you really want to write it yourself: https://tools.ietf.org/html/rfc8446

Answer 2

Unless you want to write thousands of lines of code yourself I'd recommend you to use a library like openssl or rustls to enable SSL.

Answer 3

I want milions of lines... but that's not point, I want to understand it all, so I can use it simply without libs in my app... And surely help people in future

I already found how it works in general, I even found some source (which didn't work to me). So I already know that client tells server some basic info, gets some certificate and encryption key... But still it's top of glacier with a lot more under water

Answer 4

Thanks, I found it too, by this as answer I gues I have to go trough to find out