def METHOD_NAME(self, ignore_discard=True, ignore_expires=True):
    """Return cookies as a string of "\\n"-separated "Set-Cookie3" headers.
    ignore_discard and ignore_expires: see docstring for FileCookieJar.save
    """
    now = time.time()
    r = []
    for cookie in self:
        if not ignore_discard and cookie.discard:
            continue
        if not ignore_expires and cookie.is_expired(now):
            continue
        r.append("Set-Cookie3: %s" % lwp_cookie_str(cookie))
    return "\n".join(r+[""])