Including the `Range` header on S3 requests triggers a `502 Bad Gateway` when localstack is run with SSL.

Sample test that demonstrates the issue:
```python
import logging
import io
import os

import boto3

logging.basicConfig(level=logging.INFO)


def test_range_s3():
    s3 = boto3.client('s3', endpoint_url='https://localhost:4572', use_ssl=True, verify=False)

    bucket = 'localstack-s3-range'
    obj_name = 'sample.bin'
    s3.create_bucket(Bucket=bucket)

    chunk_size = 1024

    with io.BytesIO() as data:
        data.write(os.urandom(chunk_size * 2))
        logging.info('Uploading object (size=%d)', data.getbuffer().nbytes)
        data.seek(0)
        s3.upload_fileobj(data, bucket, obj_name)

    range_header = f'bytes=0-{chunk_size - 1}'
    logging.info('Downloading using Range header: %s', range_header)
    
    # this will raise an exception
    # botocore.exceptions.ClientError: An error occurred (502) when calling the GetObject operation (reached max retries: 4): Bad Gateway
    resp = s3.get_object(Bucket=bucket, Key=obj_name, Range=range_header)
    
    content = resp['Body'].read()
    assert len(content) == chunk_size
```

This is a fairly recent regression:

Running against `localstack/localstack:latest` will fail using SSL but pass without SSL. 
Running against `localstack/localstack:0.10.6` will pass using SSL as well as without SSL.

I am guessing changes from either #1887 or #1906 broke this since those were related to `Range` functionality, but have not bisected to be sure.
result += xmltodict.unparse(dest_dict, full_document=False)
        result += '</NotificationConfiguration>'
        response._content = result
    if method == 'PUT':
        parsed = xmltodict.parse(data)
        notif_config = parsed.get('NotificationConfiguration')
        S3_NOTIFICATIONS[bucket] = []
        for dest in NOTIFICATION_DESTINATION_TYPES:
            config = notif_config.get('%sConfiguration' % (dest))
            configs = config if isinstance(config, list) else [config] if config else []
            for config in configs:
                events = config.get('Event')
                if isinstance(events, six.string_types):
                    events = [events]
                event_filter = config.get('Filter', {})
                
                s3_filter = _get_s3_filter(event_filter)
                if s3_filter and not isinstance(s3_filter.get('FilterRule', []), list):
                    s3_filter['FilterRule'] = [s3_filter['FilterRule']]
                
                notification_details = {
                    'Id': config.get('Id'),
                    'Event': events,
                    dest: config.get(dest),
                    'Filter': event_filter
                }
                S3_NOTIFICATIONS[bucket].append(clone(notification_details))
    return response
class ProxyListenerS3(ProxyListener):
    def is_s3_copy_request(self, headers, path):