When I "PUT" an object using a pre-signed by localstack S3 URL, the localstack responds with "Content Length: 233" and `<PutObjectResponse>...</PutObjectResponse>` XML in the body. 

When I run the same code against AWS S3, the content length is 0 and response body blank. Would be great if localstack matched the AWS S3 response.

Running the latest 0.9.3 localstack docker image.
import gzip
import json
import os
import requests
import unittest
import uuid
from io import BytesIO
from localstack import config
from localstack.utils.aws import aws_stack
from localstack.utils.common import (
    short_uid, get_service_protocol, to_bytes, safe_requests, to_str, new_tmp_file, rm_rf)
TEST_BUCKET_NAME_WITH_POLICY = 'test_bucket_policy_1'
TEST_BUCKET_WITH_NOTIFICATION = 'test_bucket_notification_1'
TEST_QUEUE_FOR_BUCKET_WITH_NOTIFICATION = 'test_queue_for_bucket_notification_1'
class S3ListenerTest (unittest.TestCase):