In [this PR](https://github.com/localstack/localstack/pull/1200/files) we introduced a new way of starting S3 in a separate process.

In the meantime, the service startup has been significantly reworked, and it seems that we can integrate the S3 starter into the [`multiserver.py`](https://github.com/localstack/localstack/blob/master/localstack/utils/server/multiserver.py) based loading approach that loads multiple APIs in a single process, for performance reasons. We should look into that.
bucket_name = 'test-bucket-%s' % short_uid()
        self.s3_client.create_bucket(Bucket=bucket_name)
        
        object_key = '/foo/bar/key-by-hostname'
        content_type = 'foo/bar; charset=utf-8'
        self.s3_client.put_object(Bucket=bucket_name,
                                  Key=object_key,
                                  Body='something ' * 20,
                                  ContentType=content_type)
        url = self.s3_client.generate_presigned_url(
            'get_object', Params={'Bucket': bucket_name, 'Key': object_key}
        )
        
        response = requests.get(url, verify=False)
        self.assertEqual(response.headers['content-type'], content_type)
        
        response = requests.get(url, headers={'Range': 'bytes=0-18'}, verify=False)
        self.assertEqual(response.headers['content-type'], content_type)
        self.assertEqual(to_str(response.content), 'something something')
        
        self._delete_bucket(bucket_name, [object_key])
    def test_s3_head_response_content_length_same_as_upload(self):