i have this same issue:
2017-02-21 10:21:53.215 [WARN ] [io.openhabcloud.internal.CloudClient] - Jetty request 204845 failed: null
2017-02-21 10:21:57.749 [WARN ] [io.openhabcloud.internal.CloudClient] - Jetty request 204863 failed: null
2017-02-21 10:22:19.029 [WARN ] [io.openhabcloud.internal.CloudClient] - Jetty request 204894 failed: null
2017-02-21 10:22:21.319 [WARN ] [io.openhabcloud.internal.CloudClient] - Jetty request 204910 failed: null
2017-02-21 10:22:22.756 [WARN ] [io.openhabcloud.internal.CloudClient] - Jetty request 204913 failed: null
But the functionality is OK.
It logs every action (click) i do with myopenhab app on my iPhone.
Both browsers, Safari and Firefox in ios are not giving these log info, and are working perfectly.