def build_feedbackfeed_absolute_url(domain_scheme, group_id, instance_id=
    'devilry_group_student'):
    """
    Build the absolute url to a feedbackfeed.

    Args:
        domain_scheme: The scheme and host. E.g http://www.example.com/.
        group_id: AssignmentGroup id.
        crinstance_id: Cradmin instance id.

    Returns:
        str: Absolute url to feedbackfeed.
    """
    from django_cradmin.crinstance import reverse_cradmin_url
    domain_url_start = domain_scheme.rstrip('/')
    absolute_url = '{}{}'.format(domain_url_start, reverse_cradmin_url(
        instanceid=instance_id, appname='feedbackfeed', roleid=group_id))
    return absolute_url
