As reported in https://github.com/localstack/localstack/issues/6659#issuecomment-1630932643_, `HeadObject` does not respect `ChecksumMode`. 


```shell
at 09:31:57 ➜ AWS_DEFAULT_REGION=us-west-1 aws --endpoint-url=http://localhost:4566 s3api create-bucket --bucket test-bucket --create-bucket-configuration LocationConstraint=us-west-1
{
    "Location": "http://test-bucket.s3.localhost.localstack.cloud:4566/"
}

at 09:32:13 ➜ aws --endpoint-url=http://localhost:4566 s3api put-object --bucket test-bucket --key file.json --body README.md --checksum-algorithm SHA256
{
    "ETag": "\"4bb2f1387449d690bff6336ea255909c\"",
    "ChecksumSHA256": "bzOikXXMUqRTCrpVq7Pt7LjJ0fjR3ccUfM19S/gnfqA="
}

# SHA256 missing here
at 09:32:20 ➜ aws --endpoint-url=http://localhost:4566 s3api head-object --bucket test-bucket --key file.json --checksum-mode Enabled
{
    "AcceptRanges": "bytes",
    "LastModified": "2023-07-11T13:32:15+00:00",
    "ContentLength": 1455,
    "ETag": "\"4bb2f1387449d690bff6336ea255909c\"",
    "ContentType": "binary/octet-stream",
    "Metadata": {}
}
```

Note the equivalent response from S3 actual includes the SHA256 value

```shell
at 10:21:23 ➜ aws s3api head-object --bucket test-bucket --key file.json --checksum-mode Enabled
{
    "AcceptRanges": "bytes",
    "Expiration": "expiry-date=\"Thu, 13 Jul 2023 00:00:00 GMT\", rule-id=\"all\"",
    "LastModified": "2023-07-11T14:21:09+00:00",
    "ContentLength": 1956,
    "ChecksumSHA256": "bj7fqCqtaF95M1ULwQRDJuHbL/Xd9NVMH6pua9OINcc=",
    "ETag": "\"f4be535d45019a4408dd5369986919f8\"",
    "ContentEncoding": "",
    "ContentType": "binary/octet-stream",
   
    "Metadata": {},
    
}
```

_Originally posted by @bdurrani in https://github.com/localstack/localstack/issues/6659#issuecomment-1630932643_
            
return f"{_endpoint_url(region, localstack_host)}/{bucket_name}"
def _website_bucket_url(bucket_name: str):
    # TODO depending on region the syntax of the website vary (dot vs dash before region)
    if os.environ.get("TEST_TARGET") == "AWS_CLOUD":
        region = config.AWS_REGION_US_EAST_1
        return f"http://{bucket_name}.s3-website-{region}.amazonaws.com"
    return _bucket_url_vhost(bucket_name, localstack_host=constants.S3_STATIC_WEBSITE_HOSTNAME)
def _bucket_url_vhost(bucket_name: str, region: str = "", localstack_host: str = None) -> str:
    if not region:
        region = config.AWS_REGION_US_EAST_1
    if os.environ.get("TEST_TARGET") == "AWS_CLOUD":
        if region == "us-east-1":
            return f"https://{bucket_name}.s3.amazonaws.com"
        else:
            return f"https://{bucket_name}.s3.{region}.amazonaws.com"
    host = localstack_host or (
        f"s3.{region}.{LOCALHOST_HOSTNAME}" if region != "us-east-1" else S3_VIRTUAL_HOSTNAME
    )
    s3_edge_url = config.get_edge_url(localstack_hostname=host)
    # TODO might add the region here
    return s3_edge_url.replace(f"://{host}", f"://{bucket_name}.{host}")
def _generate_presigned_url(
    client: "S3Client", params: dict, expires: int, client_method: str = "get_"
) -> str:
    return client.generate_presigned_url(
        client_method,
        Params=params,
        ExpiresIn=expires,
    )
def _make_url_invalid(url_prefix: str, _key: str, url: str) -> str: