# Type of request: This is a ...
[ ] bug report
[x] feature request

# Detailed description
As a Developer,
I want to be able to simulate BadDigest and InvalidDigest errors,
So that I can test the error handling logic

## Expected behavior
https://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html
BadDigest: The Content-MD5 you specified did not match what we received.
InvalidDigest: The Content-MD5 you specified is not valid.

## Actual behavior
localstack returns InvalidDigest when MD5 does not match payload.


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.pop('Content-Length', None)
def append_metadata_headers(method, query_map, headers):