build host from window.location.origin

app/authenticators/auth-token.js

@@ -44,6 +44,10 @@ export default class AuthToken extends Base {
   }
 
   get base_url() {
-    return `${ENV.APP.HOST}/${ENV.APP.NAMESPACE}/`;
+    if (!ENV.APP.HOST) {
+      return `${window.location.origin}/${ENV.APP.NAMESPACE}`;
+    }
+
+    return `${ENV.APP.HOST}/${ENV.APP.NAMESPACE}`;
   }
 }

config/environment.js

@@ -18,7 +18,7 @@ module.exports = function (environment) {
     },
 
     APP: {
-      NAMESPACE: '',
+      NAMESPACE: 'api',
       WS_NAMESPACE: 'ws'  // websockets namespace
       // Here you can pass flags/options to your application instance
       // when it is created