A quick update for anyone having the same issue. The cause was a bug in the activemq client that exists since version 5.14, see https://issues.apache.org/jira/browse/AMQ-6949
I managed to get the HTTP connection working by downgrading to the 5.13.4 client -- Sent from: http://activemq.2283324.n4.nabble.com/ActiveMQ-User-f2341805.html
