@Foo.method(http_method='POST',
            request_message=Foo.ProtoCollection(
                collection_fields=('foo', 'bar')),
            response_message=Foo.ProtoCollection(
                collection_fields=('id', 'foo', 'bar')),
            path='foo_multi')
def insert_multi(self, foo_collection):
    entities = [Foo.FromMessage(item_msg).
                for item_msg in foo_collection.items]
    ndb.put_multi(entities)
    response_items = [entity.ToMessage() for entity in entities]
    return Foo.ProtoCollection()(items=response_items)

url = "http://localhost:8080/_ah/api/foobar/v1.0/foo_multi/"
params = {"items": [
    {"foo": "random_words"},
    {"foo": "more_random_words"}
]}
response = requests.post(url, params=params)
print "users -> {0}".format(response.text)