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
```
'payload': {'S': str(data)}
        }
        aws_stack.create_dynamodb_table(table_name, partition_key='id')
        dynamodb.put_item(TableName=table_name, Item=item)
        return ''
    if re.match(r'^https?://.+', config.LAMBDA_FALLBACK_URL):
        response = safe_requests.post(config.LAMBDA_FALLBACK_URL, data)
        return response.content
    raise ClientError('Unexpected value for LAMBDA_FALLBACK_URL: %s' % config.LAMBDA_FALLBACK_URL)
def get_lambda_policy(function):
    iam_client = aws_stack.connect_to_service('iam')
    policies = iam_client.list_policies(Scope='Local', MaxItems=500)['Policies']
    docs = []
    for p in policies:
        
        versions = iam_client.list_policy_versions(PolicyArn=p['Arn'])['Versions']
        default_version = [v for v in versions if v.get('IsDefaultVersion')]
        versions = default_version or versions
        doc = versions[0]['Document']
        doc = doc if isinstance(doc, dict) else json.loads(doc)
        if not isinstance(doc['Statement'], list):
            doc['Statement'] = [doc['Statement']]
        for stmt in doc['Statement']:
            stmt['Principal'] = stmt.get('Principal') or {'AWS': TEST_AWS_ACCOUNT_ID}
        doc['PolicyArn'] = p['Arn']
        doc['Id'] = 'default'
        docs.append(doc)
    policy = [d for d in docs if d['Statement'][0]['Resource'] == func_arn(function)]
    return (policy or [None])[0]
def not_found_error(ref=None, msg=None):