How to redirect http traffic to https in nginx

 ## Redirect *all* port 80 requests
 server {
 listen 80 default_server;
 server_name _;
 return 301 https://$host$request_uri;
 }

## redirect only specific apps
server {
    listen 80 default_server;

    server_name _;

    return 301 https://$host$request_uri;
}

## Other servers can then be https-only
server {
    listen 80;

    server_name foo.com;
    return 301 https://foo.com$request_uri;
}

server {
    listen 443 ssl;
    server_name bar.com;
}

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References:

• https://serversforhackers.com/c/redirect-http-to-https-nginx