### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

There is an issue with `get-object-attributes` command which results in below error always: 
`aws --endpoint-url=http://localhost:4566 s3api get-object-attributes --bucket s3mock --key 20.txt --object-attributes "ObjectSize"`
````

> Response:  Unable to parse response (syntax error: line 1, column 0), invalid XML received. Further retries may succeed:
b'98\n5\n'
````

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

#### Using docker-compse.yaml to start localstack

docker-compse.yaml:

```
localstack:
    image: localstack/localstack:latest
    ports:
      - '4563-4599:4563-4599'
      - '8055:8080'
    environment:
      - SERVICES=s3
      - DEBUG=1
      - LS_LOG=error
      - DATA_DIR=/tmp/localstack/data
      - AWS_DEFAULT_REGION=eu-west-1
      # - EDGE_PORT=4566
    volumes:
      - "./.localstack:/tmp/localstack"
      - "/var/run/docker.sock:/var/run/docker.sock"
```

#### cli commands to reproduce the issue

1. Create a Bucket: `aws --endpoint-url=http://localhost:4566 s3 mb s3://s3mock`
2. Create an Object: `aws --endpoint-url=http://localhost:4566 s3 cp data/20.txt s3://s3mock`

File 20.txt content are 2-digit numbers separated by newline.

3. get-object-attributes for object 20.txt :
```

 aws --endpoint-url=http://localhost:4566 s3api get-object-attributes --bucket s3mock --key 20.txt --object-attributes "ObjectSize"

```
Results in error:

> Unable to parse response (syntax error: line 1, column 0), invalid XML received. Further retries may succeed:
b'98\n5\n'



### Environment

```markdown
- OS:Mac 12.x
- LocalStack:latest
- Node 14
```


### Anything else?

_No response_
snapshot.add_transformer(snapshot.transform.s3_api())
        # Ob
        # ht
        metadata = {"foo": "bar"}
        object_key = "key-by-hostname"
        # pu
        url = s3_client.generate_presigned_url(
            "put_object",
            Params={"Bucket": s3_bucket, "Key": object_key, "Metadata": metadata},
        )
        assert "x-amz-meta-foo=bar" in url
        response = requests.put(url, data="content 123", verify=False)
        assert response.ok, f"response returned {response.status_code}: {response.text}"
        # re
        assert not response.text
        # as
        response = s3_client.head_object(Bucket=s3_bucket, Key=object_key)
        assert response.get("Metadata", {}).get("foo") == "bar"
        snapshot.match("head_object", response)
    @pytest.mark.aws_validated
    def test_get_object_ignores_request_body(self, s3_client, s3_bucket):