# 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.


bucket_name = 'test-bucket-%s' % short_uid()
        self.s3_client.create_bucket(Bucket=bucket_name)
        
        object_key = 'key-by-hostname'
        self.s3_client.put_object(Bucket=bucket_name, Key=object_key, Body='something')
        self.s3_client.put_bucket_cors(Bucket=bucket_name,
            CORSConfiguration={
                'CORSRules': [{
                    'AllowedMethods': ['GET', 'PUT', 'POST'],
                    'AllowedOrigins': ['*'],
                    'ExposeHeaders': [
                        'ETag', 'x-amz-version-id'
                    ]
                }]
            },
        )
        
        url = self.s3_client.generate_presigned_url(
            'get_object', Params={'Bucket': bucket_name, 'Key': object_key}
        )
        response = requests.get(url, verify=False)
        self.assertEquals(response.headers['Access-Control-Expose-Headers'], 'ETag,x-amz-version-id')
        
        self._delete_bucket(bucket_name, [object_key])
    def test_s3_get_response_header_overrides(self):