NGINX configuration used to serve an SPA

default.conf

server {
    listen       80;
    server_name  localhost;
    root   /usr/share/nginx/html;
    index  index.html index.htm;

    # rely on X-Forwarded-Proto to redirect to HTTPS
    if ($http_x_forwarded_proto = "http") {
      return 301 https://$server_name$request_uri;
    }

    location / {
        # serve up index.html for any 404 with the original URI intact
        try_files $uri $uri/ /index.html; 
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }
}