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
```
action = req_data.get('Action', [None])[0]
    event_type = None
    queue_url = None
    if action == 'CreateQueue':
        event_type = event_publisher.EVENT_SQS_CREATE_QUEUE
        response_data = xmltodict.parse(response.content)
        if 'CreateQueueResponse' in response_data:
            queue_url = response_data['CreateQueueResponse']['CreateQueueResult']['QueueUrl']
    elif action == 'DeleteQueue':
        event_type = event_publisher.EVENT_SQS_DELETE_QUEUE
        queue_url = req_data.get('QueueUrl', [None])[0]
    if event_type and queue_url:
        event_publisher.fire_event(event_type, payload={'u': event_publisher.get_hash(queue_url)})
def _queue_url(path, req_data, headers):