Remove duplicate width=100% in iframe tag.
Make sure to consistent rc-refresh setttings

routes.js now multiplies the refresh value itself by 1000, so the config
value has to be stored in seconds. In order to hava a consistent default
the config-key is deleted if the user submits an empty referesh time
(value == '').
Check for the return value of stream_get_contents() ...

... because otherwise $http_response_header may not be set.