Measurement Protocol not showing analytics?

Question

Django

Hello! There is a site made on django, there is a need to send requests from the backend. To do this, we decided to use the Measurement Protocol. Here is the send function:

def send_event(cid, ec, ea, el=None):
    data = {
        'v': 1,  # API Version.
        'tid': settings.ANALYTICS_TRACKING_ID,  # Tracking ID / Property ID.
        # Anonymous Client Identifier. Ideally, this should be a UUID that
        # is associated with particular user, device, or browser instance.
        'cid': cid,
        't': 'event',  # Event hit type.
        'ec': ec,  # Event category.
        'ea': ea,  # Event action.
        'el': el,  # Event label.
        'ev': 0,  # Event value, must be an integer
    }
    requests.get('http://www.google-analytics.com/collect', params=data)

I start the function, the event goes away. But in the analytics itself, cid = 555 is empty, I tried their validator, it says that everything is OK, the request is correct. Who worked with this protocol, are there any pitfalls?