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
```
invocation_time = int(time.time() * 1000)
            
            try:
                result = self._execute(func_arn, func_details, event, context, version)
            except Exception as e:
                if asynchronous:
                    if get_from_event(event, 'eventSource') == EVENT_SOURCE_SQS:
                        sqs_queue_arn = get_from_event(event, 'eventSourceARN')
                        if sqs_queue_arn:
                            
                            sqs_error_to_dead_letter_queue(sqs_queue_arn, event, e)
                    else:
                        
                        lambda_error_to_dead_letter_queue(func_details, event, e)
                raise e
            finally:
                self.function_invoke_times[func_arn] = invocation_time
            
            return result
        
        if asynchronous:
            LOG.debug('Lambda executed in Event (asynchronous) mode, no response will be returned to caller')
            FuncThread(do_execute).start()
            return None, 'Lambda executed asynchronously.'
        return do_execute()
    def _execute(self, func_arn, func_details, event, context=None, version=None):
        """ This method must be overwritten by subclasses. """
        raise Exception('Not implemented.')
    def startup(self):