### 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_
# 
    request = HttpRequest("GET", "/", headers={"host": "localhost"})
    parser = create_parser(load_service("s3"))
    parsed_operation_model, parsed_request = parser.parse(request)
    assert parsed_operation_model.name == "ListBuckets"
def test_s3_list_buckets_with_localhost_and_port():
    # 
    request = HttpRequest("GET", "/", headers={"host": "localhost:4566"})
    parser = create_parser(load_service("s3"))
    parsed_operation_model, parsed_request = parser.parse(request)
    assert parsed_operation_model.name == "ListBuckets"
def test_query_parser_error_on_protocol_error():
    """Test that the parser raises a ProtocolParserError in case of invalid data to parse."""
    parser = QueryRequestParser(load_service("sqs"))
    request = HttpRequest(
        body=to_bytes(
            "Action=UnknownOperation&Version=2012-11-05&"
            "QueueUrl=http%3A%2F%2Flocalhost%3A4566%2F000000000000%2Ftf-acc-test-queue&"
            "MessageBody=%7B%22foo%22%3A+%22bared%22%7D&"
            "DelaySeconds=2"
        ),
        method="POST",
        headers={"Content-Type": "application/x-www-form-urlencoded"},
        path="",
    )
    with pytest.raises(ProtocolParserError):
        parser.parse(request)
def test_restjson_parser_error_on_protocol_error():