server {
    listen 80;
    server_name example.com www.example.com;
    return 301 https://example.com$request_uri;
}

server {
    listen 443 ssl;
    server_name example.com;
    root /var/www;
    index index.html;

    # ssl_certificate, etc...

    location / {
        try_files $uri $uri/ /index.html =404;
    }
}