Add Origin header in our code

Author: kjetilk

lib/create-app.js

@@ -122,8 +122,8 @@ function initHeaders (app) {
   app.use((req, res, next) => {
     res.set('X-Powered-By', 'solid-server')
 
-    // Cors lib adds Vary: Origin automatically
-    res.set('Vary', 'Accept, Authorization')
+    // Cors lib adds Vary: Origin automatically, but inreliably
+    res.set('Vary', 'Accept, Authorization, Origin')
 
     // Set default Allow methods
     res.set('Allow', 'OPTIONS, HEAD, GET, PATCH, POST, PUT, DELETE')