@GET
  @Path("{hostName}")
  @Produces("text/plain")
  @ApiOperation(value = "Returns information about a single host", response = HostResponse.HostResponseWrapper.class)
  @ApiImplicitParams({
    @ApiImplicitParam(name = QUERY_FIELDS, value = QUERY_FILTER_DESCRIPTION, dataType = DATA_TYPE_STRING, paramType = PARAM_TYPE_QUERY),
  })
  @ApiResponses({
    @ApiResponse(code = HttpStatus.SC_OK, message = MSG_SUCCESSFUL_OPERATION),
    @ApiResponse(code = HttpStatus.SC_NOT_FOUND, message = MSG_CLUSTER_OR_HOST_NOT_FOUND),
    @ApiResponse(code = HttpStatus.SC_UNAUTHORIZED, message = MSG_NOT_AUTHENTICATED),
    @ApiResponse(code = HttpStatus.SC_FORBIDDEN, message = MSG_PERMISSION_DENIED),
    @ApiResponse(code = HttpStatus.SC_INTERNAL_SERVER_ERROR, message = MSG_SERVER_ERROR),
  })
  public Response getHost(String body, @Context HttpHeaders headers, @Context UriInfo ui,
    @ApiParam(value = "host name", required = true) @PathParam("hostName") String hostName
  ) {
    return handleRequest(headers, body, ui, Request.Type.GET,
        createHostResource(m_clusterName, hostName));
  }
Handles GET /clusters/{clusterID}/hosts/{hostID} and /hosts/{hostID}
Get a specific host.

@param headers  http headers
@param ui       uri info
@param hostName host name
@return host resource representation
ambari-server/src/main/java/org/apache/ambari/server/api/services/HostService.java