add cors

configs/nginx_include.conf

@@ -14,4 +14,11 @@ location /~static/ {
 
 location / {
     try_files $uri @drop_app;
+    if ($request_method = OPTIONS) {
+        return 204;
+    }
+    add_header Access-Control-Allow-Origin *;
+    add_header Access-Control-Max-Age 3600;
+    add_header Access-Control-Expose-Headers Content-Length;
+    add_header Access-Control-Allow-Headers Range;
 }