def normalize_prefetch_lookups(lookups, prefix=None):
    ret = []
    for lookup in lookups:
        if not isinstance(lookup, Prefetch):
            lookup = Prefetch(lookup)
        if prefix:
            lookup.add_prefix(prefix)
        ret.append(lookup)
    return ret
Return a channel object based on ``env.host_string``.
dataset/ETHPy150Open django/django/django/db/models/query.py/normalize_prefetch_lookups--crossover with--dataset/ETHPy150Open fabric/fabric/fabric/state.py/default_channel