When creating the following bucket notification configuration:
```json
{
    "QueueConfigurations": [
        {
            "Id": "some-id",
            "QueueArn": "arn:aws:sqs:eu-central-1:123456789:my-queue",
            "Events": [
                "s3:ObjectCreated:*"
            ],
            "Filter": {
                "Key": {
                    "FilterRules": [
                        {
                            "Name": "Prefix",
                            "Value": "path/to/folder/"
                        },
                        {
                            "Name": "Suffix",
                            "Value": ".json"
                        }
                    ]
                }
            }
        }
    ]
}
```
and adding some files to S3, I get the following errors from localstack:

```
localstack.services.s3.s3_listener: Unknown filter name: "Prefix"
localstack.services.s3.s3_listener: Unknown filter name: "Suffix"
```

When I change the FilterRule names from "Prefix" to "prefix" and "Suffix" to "suffix", everything works. AWS supports the capitalised name, so this looks like a bug in localstack.
bucket_name = normalize_bucket_name(bucket_name)
        host = config.HOSTNAME_EXTERNAL
        if ':' not in host:
            host = '%s:%s' % (host, config.PORT_S3)
        return re.sub(r'<Location>\s*([a-zA-Z0-9\-]+)://[^/]+/([^<]+)\s*</Location>',
            r'<Location>%s://%s/%s/\2</Location>' % (get_service_protocol(), host, bucket_name),
            content, flags=re.MULTILINE)
    @staticmethod
    def is_query_allowable(method, query):
        
        if not query:
            return True
        
        contains_cred = 'X-Amz-Credential' in query and 'X-Amz-Signature' in query
        contains_key = 'AWSAccessKeyId' in query and 'Signature' in query
        if (method == 'POST' and query.startswith('uploadId')) or contains_cred or contains_key:
            return True
UPDATE_S3 = ProxyListenerS3()