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
```
underscore_replacement = '---'
    meta_header_prefix = 'x-amz-meta-'
    prefix_len = len(meta_header_prefix)
    updated = False
    for key in list(request_headers.keys()):
        if key.lower().startswith(meta_header_prefix):
            key_new = meta_header_prefix + key[prefix_len:].replace('_', underscore_replacement)
            if key != key_new:
                request_headers[key_new] = request_headers.pop(key)
                updated = True
    if response:
        for key in list(response.headers.keys()):
            if key.lower().startswith(meta_header_prefix):
                key_new = meta_header_prefix + key[prefix_len:].replace(underscore_replacement, '_')
                if key != key_new:
                    response.headers[key_new] = response.headers.pop(key)
    return updated
def fix_creation_date(method, path, response):