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' and path == '/':
            
            return 200
        if method != 'POST':
            return
        region_name = aws_stack.get_region()
        req_data = urlparse.parse_qs(to_str(data))
        action = req_data.get('Action', [None])[0]
        content_str = content_str_original = to_str(response.content)
        if response.status_code >= 400:
            return response
        _fire_event(req_data, response)
        
        if action == 'GetQueueAttributes':
            content_str = _add_queue_attributes(path, req_data, content_str, headers)
        
        if action in ('CreateQueue', 'GetQueueUrl', 'ListQueues', 'GetQueueAttributes'):
            if config.USE_SSL and '<QueueUrl>http://' in content_str:
                
                content_str = re.sub(r'<QueueUrl>\s*http://', r'<QueueUrl>https://', content_str)