def quote_plus(s):
    """
    Convert some URL elements to be HTTP-safe.

    Not the same as in urllib, because, for instance, parentheses and commas
    are passed through.

    Parameters
    ----------
    s: input URL/portion

    Returns
    -------
    corrected URL
    """
    s = s.replace('/', '%2F')
    s = s.replace(' ', '%20')
    return s