upstream app {
    server app:8080;
}
server {
    listen 80;

    root   /usr/share/nginx/html;

    location / {
        index  index.html index.htm;
        try_files $uri $uri/ /index.html;
    }

    location /api {
        rewrite /api/(.*) /$1 break;
        proxy_pass http://app;
    }
}