'Returns True if :attr:`status_code` is less than 400.
This attribute checks if the status code of the response is between
400 and 600 to see if there was a client error or a server error. If
the status code, is between 200 and 400, this will return True. This
is **not** a check to see if the response code is ``200 OK``.'

@property
def ok(self):

    try:
        self.raise_for_status()
    except HTTPError:
        return False
    return True
