public function testCreateUrl()
 {
     $actionName = 'DescribeInstances';
     $param = array('Region' => 'gz', 'Action' => 'DescribeInstances');
     $url = $this->request->createUrl($actionName, $param, 'GET');
     $this->assertStringStartsWith($this->request->createUrl($actionName, $param, 'POST'), $url);
 }