Hi, I don`t have SSL in my host and not able to host my facebook app in my hosting. I have decided to use heroku. Can I use my website within iframe of heroku and facebook app will iframe my heroku link ? it will be iframe within iframe, is it possible ? My main pait to give access to my facebook app users to access to some part of my website which I can`t move to heroku complete. Please advise.
You could make your own ssl cert or get one for like $8 per year (ssls.com). You could show a site in an iframe but it could cause issues. I try to stay away from them. It wouldn't be hard to try using an iframe though.
Or you can simply use cloudflare as proxy . They support SSL connections even when your server doesn't have a certificate. Only thing you need to be able to do is to accept incoming connections on 443 port / https protocol.