function testCheckMimeType()
 {
     $http = new HttpHeader();
     $this->assertTrue($http->checkMimeType('audio/mpeg', 'file'));
     $this->assertTrue($http->checkMimeType('image/png', 'img'));
     $this->assertTrue($http->checkMimeType('text/html', 'html'));
     $this->assertFalse($http->checkMimeType('image/png', 'html'));
 }