@GET
  @Path("hdfsCheck")
  public Response hdfsCheck(){
    try {
      hdfsFileUtils.hdfsCheck();
      return Response.ok().build();
    }catch (Exception ex){
      LOGGER.error(ex.getMessage(),ex);
      throw new WfmWebException(ex);
    }
  }
This is a class used to bridge the communication between the and the Oozie
API executing inside ambari.
contrib/views/wfmanager/src/main/java/org/apache/oozie/ambari/view/OozieProxyImpersonator.java