GET /v1/queues/demoqueue/messages?echo=true HTTP/1.1 
Host: queues.api.openstack.org
Content-type: application/json 
Client-ID: e58668fc-26eb-11e3-8270-5b3128d43830
X-Auth-Token: eaaafd18-0fed-4b3a-81b4-663c99ec1cbb
Accept: application/json
X-Project-Id: <project_id>