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 the Java classpath, using the parent folder of the
        given archive as the base folder.
        The result contains any *.jar files in the base folder, as
        well as any JAR files in the "lib/*" subfolder living
        alongside the supplied java archive (.jar or .zip).
        :param archive: an absolute path to a .jar or .zip Java archive
        :return: the Java classpath, relative to the base dir of "archive"
        """
        entries = ['.']
        base_dir = os.path.dirname(archive)
        for pattern in ['%s/*.jar', '%s/lib/*.jar', '%s/*.zip']:
            for entry in glob.glob(pattern % base_dir):
                if os.path.realpath(archive) != os.path.realpath(entry):
                    entries.append(os.path.relpath(entry, base_dir))
        
        
        entries.append(os.path.relpath(archive, base_dir))
        result = ':'.join(entries)
        return result
EXECUTOR_LOCAL = LambdaExecutorLocal()
EXECUTOR_CONTAINERS_SEPARATE = LambdaExecutorSeparateContainers()
EXECUTOR_CONTAINERS_REUSE = LambdaExecutorReuseContainers()
DEFAULT_EXECUTOR = EXECUTOR_CONTAINERS_SEPARATE
AVAILABLE_EXECUTORS = {
    'local': EXECUTOR_LOCAL,
    'docker': EXECUTOR_CONTAINERS_SEPARATE,
    'docker-reuse': EXECUTOR_CONTAINERS_REUSE
}