POST http://localhost:8080/cmx/cs/localhost-orcl-DS_UI1/task/urn:b4p2:15934?taskAction=Cancel

{
     taskType: {
      name:"UpdateWithApprovalWorkflow",
      taskAction: [{name: "Cancel"}]
     },
     taskId: "urn:b4p2:15934",
     owner: "manager",
     title: "Smoke test task 222",
     comments: "Smoke testing",
     attachments: [
          {
               id: "TEMP_SVR1.1VDVS"
          }
     ],
     dueDate: "2015-06-15T00:00:00",
     status: "OPEN",
     priority: "NORMAL",
     creator: "admin",
     createDate: "2015-06-15T00:00:00",
     updatedBy: "admin",
     lastUpdateDate: "2015-06-15T00:00:00",
     businessEntity: "Person",
     orsId: "localhost-orcl-DS_UI1",
     processId: '3685',
     taskRecord: [{
       businessEntity:{
         name: 'Person',
         key:{
            rowid: '123',
            systemName: '',
            sourceKey: ''
         }
       }
     }]
}