sqs.changeMessageVisibility according to [this](https://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/API_ChangeMessageVisibility.html#API_ChangeMessageVisibility_Examples) makes a request directly to the Queue's URL rather than via the SQS Endpoint. (I'm already setting SQS endpoint to LOCALSTACK_HOSTNAME - makes no difference for this call)..

In localstack the queue URL host returned is by default set to the value of HOSTNAME_EXTERNAL, which I'm setting to localstack, but calling this method within a lambda, does not work and I get the error:

```
UnknownEndpoint: Inaccessible host: `localstack'. This service may not be available in the `us-east-1' region. 
```

So, how can I make the queue URL accessible from within a lambda using localstack? Effectively I need to make **http://localstack** accessible from within lambda.

I'm using the following cmd to start localstack:

```
LAMBDA_EXECUTOR=docker-reuse DEBUG=1 LAMBDA_REMOTE_DOCKER=0 DATA_DIR=/tmp/localstack/data HOSTNAME_EXTERNAL=localstack localstack start
```
if method == 'OPTIONS':
            return 200
        req_data = parse_request_data(method, path, data)
        if req_data:
            action = req_data.get('Action', [None])[0]
            if action == 'SendMessage':
                new_response = self._send_message(path, data, req_data, headers)
                if new_response:
                    return new_response
            elif action == 'SetQueueAttributes':
                queue_url = _queue_url(path, req_data, headers)
                forward_attrs = _set_queue_attributes(queue_url, req_data)
                if len(req_data) != len(forward_attrs):
                    
                    return _get_attributes_forward_request(method, path, headers, req_data, forward_attrs)
            elif action == 'DeleteQueue':
                QUEUE_ATTRIBUTES.pop(_queue_url(path, req_data, headers), None)
            if 'QueueName' in req_data:
                encoded_data = urlencode(req_data, doseq=True) if method == 'POST' else ''
                modified_url = None
                if method == 'GET':
                    base_path = path.partition('?')[0]
                    modified_url = '%s?%s' % (base_path, urlencode(req_data, doseq=True))
                return Request(data=encoded_data, url=modified_url, headers=headers, method=method)
        return True
    def return_response(self, method, path, data, headers, response, request_handler):