Nginx config with CORS headers added and Basic Auth

somehost.conf

server {
    server_name example.com;
    listen 443 ssl;
    ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
    root /var/www/html;
    access_log off;

    location / {
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' $http_origin;
            add_header 'Access-Control-Allow-Credentials' 'true';
            add_header 'Access-Control-Allow-Methods' 'GET,POST,OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'Authorization,If-Modified-Since,Cache-Control,Content-Type';
            add_header 'Access-Control-Max-Age' 7200;
            return 204;
        }
        proxy_pass http://127.0.0.1:8080;
        auth_basic 'Realm';
        auth_basic_user_file /etc/nginx/.htpasswd;
    }
}