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
```
bucket_name = normalize_bucket_name(bucket_name)
    cors = BUCKET_CORS.get(bucket_name)
    if not cors:
        return
    origin = request_headers.get('Origin', '')
    rules = cors['CORSConfiguration']['CORSRule']
    if not isinstance(rules, list):
        rules = [rules]
    for rule in rules:
        
        allowed_methods = rule.get('AllowedMethod', [])
        if request_method in allowed_methods:
            allowed_origins = rule.get('AllowedOrigin', [])
            for allowed in allowed_origins:
                if origin in allowed or re.match(allowed.replace('*', '.*'), origin):
                    response.headers['Access-Control-Allow-Origin'] = origin
                    if 'ExposeHeader' in rule:
                        expose_headers = rule['ExposeHeader']
                        response.headers['Access-Control-Expose-Headers'] = \
                            ','.join(expose_headers) if isinstance(expose_headers, list) else expose_headers
                    break
def append_last_modified_headers(response, content=None):