public function to($format, array $options = array()) {
		switch ($format) {
			case 'array':
				$array = array();
				$class = new ReflectionClass(get_class($this));

				foreach ($class->getProperties(ReflectionProperty::IS_PUBLIC) as $prop) {
					$array[$prop->getName()] = $prop->getValue($this);
				}
				return $array;
			case 'url':
				$host = $this->host . ($this->port ? ":{$this->port}" : '');
				return "{$this->scheme}://{$host}{$this->path}";
			case 'context':
				$defaults = array('content' => $this->body(), 'ignore_errors' => true);
				return array($this->scheme => $options + $defaults);
			case 'string':
			default:
				return (string) $this;
		}
	}