Fetches the url to the original image from an image attachment ID

        :param image_id: The image you want to fethc
        :type image_id: str
        :return: An url where you can download the original image
        :rtype: str
        :raises: FBchatException if request failed

def fetchImageUrl(self, image_id):
        """Fetches the url to the original image from an image attachment ID

        :param image_id: The image you want to fethc
        :type image_id: str
        :return: An url where you can download the original image
        :rtype: str
        :raises: FBchatException if request failed
        """
        image_id = str(image_id)
        data = {"photo_id": str(image_id)}
        j = self._get(
            ReqUrl.ATTACHMENT_PHOTO, query=data, fix_request=True, as_json=True
        )

        url = get_jsmods_require(j, 3)
        if url is None:
            raise FBchatException("Could not fetch image url from: {}".format(j))
        return url