add CORS header globally always (#6029)

src/mhd/mhd_responses.c

@@ -69,6 +69,10 @@ TALER_MHD_add_global_headers (struct MHD_Response *response)
                   MHD_add_response_header (response,
                                            MHD_HTTP_HEADER_CONNECTION,
                                            "close"));
+  GNUNET_break (MHD_YES ==
+                MHD_add_response_header (response,
+                                         MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
+                                         "*"));
 }