fix nginx server config

app/conf/nginx/nginx.conf

@@ -27,9 +27,8 @@ http {
         default_type application/octet-stream;
         access_log /var/log/nginx/access.log;
         gzip off;
-}
 
-server {
+	server {
         	listen 4000 default_server;
 		#        listen [::]:80 default_server;
 
@@ -44,5 +43,6 @@ server {
 	        	# as directory, then fall back to displaying a 404.
                 	try_files $uri $uri/ =404;
         	}
-}
+	}
 
+}