```
        $args = [
            'version' => '2006-03-01',
            'region' => 'eu-west-1',
            'credentials' => CredentialsProvider::get(),
            'http' => ['decode_content' => false],
            'retries' => 6,
            'endpoint' => 'http://localstack:4572',
            'bucket_endpoint' => true
        ];

        $this->client = new S3Client($args);
        $result = $this->client->createBucket([
            'Bucket' => "localbucket",
        ]);
        $buckets = $this->client->listBuckets();
```

$result shows the `@metadata` statusCode as 200 however the returned Location which should tell me where the created bucket is, is an empty string. So it isn't creating the bucket, but I'm getting a 200 response. Just to be sure I run `listBuckets()` and it confirms nothing is being created.

docker-compose.yml settings for localstack:

```
    localstack:
        container_name: localstack
        image: localstack/localstack
        ports:
          - "4567-4593:4567-4593"
          - "${PORT_WEB_UI-8080}:${PORT_WEB_UI-8080}"
        environment:
          - HOSTNAME=pi.docker
          - SERVICES=s3,dynamodb
          - DEFAULT_REGION=eu-west-1
#            - DEBUG=${DEBUG- }
          - DATA_DIR=/tmp/localstack/data
          - PORT_WEB_UI=8080
#            - LAMBDA_EXECUTOR=local
          - DYNAMODB_ERROR_PROBABILITY=0.0
          - DOCKER_HOST=unix:///var/run/docker.sock
        volumes:
          - "${TMPDIR:-/tmp/localstack}:/tmp/localstack"
          - "/var/run/docker.sock:/var/run/docker.sock"
```

Bonus issue: as far as I can tell persistence for s3 doesn't work, I've set DATA_DIR, I've tried changing the volume to `"localstack:/tmp/localstack"` and setting a persisting volume for that. And the directory does persist, however the s3 data isn't stored here so it's reset when taking down the container.
"""Add Last-Modified header with current time
    (if the response content is an XML containing <LastModified>, add that instead)"""
    time_format = '%a, %d %b %Y %H:%M:%S GMT'  
    try:
        if content:
            last_modified_str = re.findall(r'<LastModified>(.*)</LastModified>', content)
            if last_modified_str:
                last_modified_str = last_modified_str[0]
                last_modified_time_format = dateutil.parser.parse(last_modified_str).strftime(time_format)
                response.headers['Last-Modified'] = last_modified_time_format
    except TypeError as err:
        LOGGER.debug('No parsable content: %s' % err)
    except ValueError as err:
        LOGGER.error('Failed to parse LastModified: %s' % err)
    except Exception as err:
        LOGGER.error('Caught generic exception (parsing LastModified): %s' % err)
    
    try:
        if response.headers.get('Last-Modified', '') == '':
            response.headers['Last-Modified'] = datetime.datetime.now().strftime(time_format)
    except Exception as err:
        LOGGER.error('Caught generic exception (setting LastModified header): %s' % err)
def append_list_objects_marker(method, path, data, response):