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
```
if 'marker=' in path:
        content = to_str(response.content)
        if '<ListBucketResult' in content and '<Marker>' not in content:
            parsed = urlparse.urlparse(path)
            query_map = urlparse.parse_qs(parsed.query)
            insert = '<Marker>%s</Marker>' % query_map.get('marker')[0]
            response._content = content.replace('</ListBucketResult>', '%s</ListBucketResult>' % insert)
            response.headers['Content-Length'] = str(len(response._content))
def append_metadata_headers(method, query_map, headers):