The following example `serverless.yml` fails to deploy on localstack:

```yaml
service: "localtest"

provider:
  name: "aws"
  runtime: "nodejs10.x"

functions:
  hello:
    handler: "handler.hello"
    
resources:
  Resources:
    ApiGatewayRestApi:
      Type: "AWS::ApiGateway::RestApi"
      Properties:
        Name: "${self:provider.stage}-${self:service}"
    GatewayResponseDefault400:
      Type: "AWS::ApiGateway::GatewayResponse"
      Properties:
        RestApiId:
          Ref: "ApiGatewayRestApi"
        ResponseType: "DEFAULT_4XX"
        ResponseTemplates:
          application/json: '{"errors":[{"message":"Custom text."}]}'
    GatewayResponseUnauthorized:
      Type: "AWS::ApiGateway::GatewayResponse"
      Properties:
        RestApiId:
          Ref: "ApiGatewayRestApi"
        ResponseType: "UNAUTHORIZED"
        ResponseTemplates:
          application/json: '{"errors":[{"message":"Custom text!", "extra":"Some extra info"}]}'
    GatewayResponseDefault500:
      Type: "AWS::ApiGateway::GatewayResponse"
      Properties:
        RestApiId:
          Ref: "ApiGatewayRestApi"
        ResponseType: "DEFAULT_5XX"
        ResponseTemplates:
          application/json: '{"errors":[{"message":$context.error.messageString}]}'
    GatewayResponseIntegrationTimeout:
      Type: "AWS::ApiGateway::GatewayResponse"
      Properties:
        RestApiId:
          Ref: "ApiGatewayRestApi"
        ResponseType: "INTEGRATION_TIMEOUT"
        ResponseTemplates:
          application/json: '{"errors":[{"message":$context.error.messageString}]}'

plugins:
- "serverless-localstack"

custom:
  localstack:
    stages:
      - "local"
```

The error on the localstack end is `Exception: CloudFormation deployment for resource type ApiGateway::GatewayResponse not yet implemented`.
match = [v for (k, v) in res_obj['resourceMethods'].items()
                     if resource_props['HttpMethod'] in (v.get('httpMethod'), k)]
            return match or None
        elif resource_type == 'SQS::Queue':
            sqs_client = aws_stack.connect_to_service('sqs')
            queues = sqs_client.list_queues()
            result = list(filter(lambda item:
                
                item.endswith('/%s' % resource_id), queues.get('QueueUrls', [])))
            if not result:
                return None
            result = sqs_client.get_queue_attributes(QueueUrl=result[0], AttributeNames=['All'])['Attributes']
            result['Arn'] = result['QueueArn']
            return result
        elif resource_type == 'SNS::Topic':
            topics = aws_stack.connect_to_service('sns').list_topics()
            result = list(filter(lambda item: item['TopicArn'] == resource_id, topics.get('Topics', [])))
            return result[0] if result else None
        elif resource_type == 'S3::Bucket':
            bucket_name = resource_props.get('BucketName') or resource_id
            return aws_stack.connect_to_service('s3').get_bucket_location(Bucket=bucket_name)
        elif resource_type == 'Logs::LogGroup':
            
            raise Exception('ResourceNotFound')
        elif resource_type == 'Kinesis::Stream':
            stream_name = resolve_refs_recursively(stack_name, resource_props['Name'], resources)
            result = aws_stack.connect_to_service('kinesis').describe_stream(StreamName=stream_name)
            return result
        elif resource_type == 'StepFunctions::StateMachine':
            sm_name = resource_props.get('StateMachineName') or resource_id