public function __construct(array $config = array()) {
		$defaults = array(
			'scheme' => 'tcp',
			'host' => 'localhost',
			'port' => null,
			'username' => null,
			'password' => null,
			'path' => null,
			'body' => null
		);
		$config += $defaults;

		foreach (array_filter($config) as $key => $value) {
			$this->{$key} = $value;
		}
		parent::__construct($config);
	}