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.
key_by_path = 'key-by-hostname'
        key_by_host = 'key-by-host'
        
        queue_url = self.sqs_client.create_queue(QueueName=TEST_QUEUE_FOR_BUCKET_WITH_NOTIFICATION)['QueueUrl']
        queue_attributes = self.sqs_client.get_queue_attributes(QueueUrl=queue_url, AttributeNames=['QueueArn'])
        
        self.s3_client.create_bucket(Bucket=TEST_BUCKET_WITH_NOTIFICATION)
        self.s3_client.put_bucket_versioning(Bucket=TEST_BUCKET_WITH_NOTIFICATION,
                                             VersioningConfiguration={'Status': 'Enabled'})
        self.s3_client.put_bucket_notification_configuration(Bucket=TEST_BUCKET_WITH_NOTIFICATION,
                                                        NotificationConfiguration={'QueueConfigurations': [
                                                            {'QueueArn': queue_attributes['Attributes']['QueueArn'],
                                                             'Events': ['s3:ObjectCreated:*']}]})
        
        obj = self.s3_client.put_object(Bucket=TEST_BUCKET_WITH_NOTIFICATION, Key=key_by_path, Body='something')
        
        
        headers = {'Host': '{}.s3.amazonaws.com'.format(TEST_BUCKET_WITH_NOTIFICATION), 'authorization': 'some_token'}
        url = '{}/{}'.format(os.getenv('TEST_S3_URL'), key_by_host)
        
        response = requests.put(url, data='something else', headers=headers, verify=False)
        self.assertTrue(response.ok)
        queue_attributes = self.sqs_client.get_queue_attributes(QueueUrl=queue_url,
                                                           AttributeNames=['ApproximateNumberOfMessages'])
        message_count = queue_attributes['Attributes']['ApproximateNumberOfMessages']
        
        self.assertEqual(message_count, '2')