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
```
def __init__(self, region=None, prefix=None):
        
        
        self.region = region or get_local_region()
        
        self.prefix = prefix
    def apply_json(self, j):
        if isinstance(j, str):
            j = json.loads(j)
        self.__dict__.update(j)
    @staticmethod
    def from_string(s):
        parts = s.split(':')
        if len(parts) == 1:
            if s in PREDEFINED_ENVIRONMENTS:
                return PREDEFINED_ENVIRONMENTS[s]
            parts = [get_local_region(), s]
        if len(parts) > 2:
            raise Exception('Invalid environment string "%s"' % s)
        region = parts[0]
        prefix = parts[1]
        return Environment(region=region, prefix=prefix)
    @staticmethod
    def from_json(j):
        if not isinstance(j, dict):
            j = j.to_dict()
        result = Environment()
        result.apply_json(j)
        return result
    def __str__(self):