headBucket method
      
Future<Map<String?, String?> > 
headBucket(
    
    
- String bucket, {
- String? region,
- SessionQCloudCredentials? sessionCredentials,
Implementation
Future<Map<String?, String?>> headBucket(String bucket, {String? region, SessionQCloudCredentials? sessionCredentials}) {
  return cosApi.headBucket(serviceKey, bucket, region, sessionCredentials);
}