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
```
return result
class Util:
    debug_java_port = False
    @classmethod
    def get_java_opts(cls):
        opts = config.LAMBDA_JAVA_OPTS or ''
        if '_debug_port_' in opts:
            if not cls.debug_java_port:
                cls.debug_java_port = get_free_tcp_port()
            opts = opts.replace('_debug_port_', ('%s' % cls.debug_java_port))
        return opts
    @classmethod
    def get_host_path_for_path_in_docker(cls, path):
        return re.sub(r'^%s/(.*)$' % config.TMP_FOLDER,
                      r'%s/\1' % config.HOST_TMP_FOLDER, path)
    @classmethod
    def docker_image_for_runtime(cls, runtime):
        docker_tag = runtime
        docker_image = config.LAMBDA_CONTAINER_REGISTRY
        
        
        lambdas_to_add_prefix = ['dotnetcore', 'python2.7', 'python3.6', 'python3.7']
        if docker_image == 'lambci/lambda' and any(img in docker_tag for img in lambdas_to_add_prefix):
            docker_tag = '20191117-%s' % docker_tag
        return '"%s:%s"' % (docker_image, docker_tag)
    @classmethod
    def get_docker_remove_flag(cls):
        return '--rm' if config.LAMBDA_REMOVE_CONTAINERS else ''
    @classmethod
    def get_java_classpath(cls, archive):