Forward origin header to allow cors support

Author: Szpadel

lib/responseHelper.js

@@ -31,6 +31,7 @@ const allowedRequestHeaders = [
     'access-control-allow-methods',
     'access-control-allow-origin',
     'access-control-expose-headers',
+    'origin',
 ];
 
 const headersToLambda = headers => {