### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When reading a file of a bucket with the Java AWS SDK the content-length is not set in the GetObjectResponse.

![image](https://github.com/localstack/localstack/assets/90579580/4c89a103-b064-4061-a91e-2012b19b838f)

![image](https://github.com/localstack/localstack/assets/90579580/8f52adf0-1205-4d6f-8fd0-6d026cac6db6)


### Expected Behavior

The content-length is included in the response

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

This is the content of my docker-compose file:
`  s3:
    container_name: "s3test"
    image: "localstack/localstack:2.2.0"
    ports:
      - "4566:4566"
    volumes:
      - ./src/test/local/s3/data:/var/lib/localstack/s3
      - ./src/test/local/s3/init-s3.sh:/etc/localstack/init/ready.d/init-s3.sh`

In the init script I create a bucket and put some file to it:
`awslocal s3api create-bucket --bucket test-bucket
aws s3api put-object --body /var/lib/localstack/s3/test.png --bucket test-bucket --key storage/test.png --content-type image/png --endpoint-url http://localhost:4566`

Then I query the file using the getObject Method of the S3Client of the Java AWS SDK


### Environment

```markdown
- OS: Windows 10
- LocalStack:2.2.0
```


### Anything else?

This behavior starts with version 2.2.0. Using version 2.1.0 everything works as expected
def test_proxy_with_custom_client(
        self, httpserver: HTTPServer, httpserver_echo_request_metadata
    ):
        """The Proxy class allows the injection of a custom HTTP client which can attach default headers to every
        request. this test verifies that this works through the proxy implementation."""
        httpserver.expect_request("/").respond_with_handler(httpserver_echo_request_metadata)
        with SimpleRequestsClient() as client:
            client.session.headers["X-My-Custom-Header"] = "hello world"
            proxy = Proxy(httpserver.url_for("/").lstrip("/"), client)
            request = Request(
                path="/",
                method="POST",
                body="foobar",
                remote_addr="127.0.0.10",
                headers={"Host": "127.0.0.1:80"},
            )
            response = proxy.request(request)
            assert "X-My-Custom-Header" in response.json["headers"]
            assert response.json["method"] == "POST"
            assert response.json["headers"]["X-My-Custom-Header"] == "hello world"
            assert response.json["headers"]["X-Forwarded-For"] == "127.0.0.10"
            assert response.json["headers"]["Host"] == "127.0.0.1:80"
@pytest.mark.parametrize("consume_data", [True, False])
def test_forward_files_and_form_data_proxy_consumes_data(