def METHOD_NAME(
    mocked_make_request,
    make_organization_and_region,
    make_alert_receive_channel,
):
    organization, region = make_organization_and_region()
    organization.save()
    alert_receive_channel = make_alert_receive_channel(
        organization=organization,
        integration=AlertReceiveChannel.INTEGRATION_ALERTMANAGER,
    )
    expected_message = bytes(f"Redirected to {region.oncall_backend_url}", "utf-8")
    mocked_make_request.return_value = HttpResponse(expected_message, status=status.HTTP_200_OK)
    client = APIClient()
    url = reverse("integrations:alertmanager", kwargs={"alert_channel_key": alert_receive_channel.token})
    data = {"value": "test"}
    response = client.post(url, data, format="json")
    assert mocked_make_request.called
    assert response.content == expected_message
    assert response.status_code == status.HTTP_200_OK