SSL Certificate for web server

Hello, I am using cloudflare tunnel for my web application
My web application is running on nginx port 80,
cloudflare give me an ssl for my tunnel but
I want to know if I need to install an ssl certificate on nginx and configure nginx with https and port 443 ?
thank you.

Without Tunnel, you always need a certificate and a proper SSL configuration on your server. With a Tunnel setup on the same machine as the server, it generally is also advised but, as Tunnel already encrypts the origin connection, you could in theory leave the localhost connection on HTTP. Though ideally you should still have HTTPS as you may run into content issues.

Again, that only applies to local Tunnel setups. For everything else you need SSL.

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