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
```
bucket_name = normalize_bucket_name(bucket_name)
    lock_config = OBJECT_LOCK_CONFIGS.get(bucket_name)
    status_code = 200
    if not lock_config:
        
        lock_config = {
            'Error': {
                'Code': 'ObjectLockConfigurationNotFoundError',
                'Message': 'Object Lock configuration does not exist for this bucket'
            }
        }
        status_code = 404
    body = xmltodict.unparse(lock_config)
    return requests_response(body, status_code=status_code)
def set_lifecycle(bucket_name, lifecycle):
    bucket_name = normalize_bucket_name(bucket_name)
    
    if isinstance(to_str(lifecycle), six.string_types):
        lifecycle = xmltodict.parse(lifecycle)
    BUCKET_LIFECYCLE[bucket_name] = lifecycle
    return 200
def set_replication(bucket_name, replication):
    bucket_name = normalize_bucket_name(bucket_name)
    
    if isinstance(to_str(replication), six.string_types):
        replication = xmltodict.parse(replication)
    BUCKET_REPLICATIONS[bucket_name] = replication
    return 200
def set_encryption(bucket_name, encryption):