fixed cors

app/assets/js/app.js

@@ -3,9 +3,10 @@ import { routes } from './routes.js';
 let DEBUG = true;
 window.DEBUG = DEBUG;
 
-let SERVER_URL;
+let SERVER_HOST;
 if (DEBUG) SERVER_HOST = 'localhost';
 else SERVER_HOST = 'a2s.su';
+window.SERVER_HOST = SERVER_HOST;
 
 /* main */
 window.onload = function () {
@@ -75,12 +76,18 @@ const location_handler = async () => {
 };
 
 function get_from_api(callback, api_method = '', params = {}) {
-  respone = '';
-
   if (api_method == '') {
     console.log('wrong method');
   } else {
-    fetch(`http://${SERVER_HOST}:3000/api/v1.0/${api_method}`)
+    let url = `http://${SERVER_HOST}:3000/api/v1.0/${api_method}`;
+    let opts = {
+      method: 'get',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    };
+
+    fetch(url, opts)
       .then((response) => {
         return response.json();
       })