import mimetypes


def _is_image(url):
    """
    Checks whether a normal url contains an image.

    Params:
        (str) url: the url for the image
    Returns:
        (bool): True if url contains an image, False otherwise.
    """
    mimetype, encoding = mimetypes.guess_type(url)
    return (mimetype and mimetype.startswith('image'))