[O] Optimize loadCourses request

src/components/app/app.ts

@@ -93,17 +93,8 @@ export default class App extends Vue
      */
     public loadCoursesAfterLogin()
     {
-        // Fetch request
+        this.http.post('/courses', {}).then(response =>
-        fetch(`${Constants.API_URL}/courses`,
-            {method: 'POST', body: JSON.stringify({token: this.token})})
-        .then(res =>
         {
-            // Get response body text
-            res.text().then(text =>
-            {
-                // Parse response
-                let response = JSON.parse(text);
-
             // Check success
             if (response.success)
             {
@@ -118,9 +109,7 @@ export default class App extends Vue
                 // Show error message TODO: Show it properly
                 alert(response.data);
             }
-            })
+        });
-        })
-        .catch(alert)
     }
 
     /**