<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_dm_online(self):
 """ Use requests module to get data model from Earthref. If this fails or times out, return false. Returns --------- result : requests.models.Response, False if unsuccessful """

        if not requests:
            return False
        try:
            req = requests.get("https://earthref.org/MagIC/data-models/3.0.json", timeout=3)
            if not req.ok:
                return False
            return req
        except (requests.exceptions.ConnectTimeout, requests.exceptions.ConnectionError,
                requests.exceptions.ReadTimeout):
            return False