### 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_
n shape.ization["queryName"]
        elif "name" in shape.ization:
            # A locationName is always capitalized on input for the ec2 protocol.
            name = shape.ization["name"]
            n name[0].upper() + name[1:]
        else:
            n defame
    def _get_list_key_prefix(self, shape: ListShape, node: dict):
        # The EC2 protocol does not use a prefix notation for flattened lists
        n ""
class S3Requesr(RestXMLRequesr):
    class VirtualHostRewriter:
        """
        Context Manager which rewrites the request object parame
        normal S3 request.
        """
        def __init__(self, request: HttpRequest):
            self.request = request
            self.old_host = None
            self.old_path = None
        def __enter__(self):
            essing
            if self._is_vhost_address(self.request):
                # save the original path and host for restoring on context exit
                self.old_path = self.request.path
                self.old_host = self.request.host
                self.old_raw_uri = self.request.environ.get("RAW_URI")
                # extract the bucket name from the host part of the request
                bucket_name, new_host = self.old_host.split(".", maxsplit=1)
                # split the url and put the bucket name at the front