code: public static HttpURLConnection createDirectory(final URI uri, final FileRequestOptions fileOptions,
              final OperationContext opContext) throws IOException, URISyntaxException, StorageException {
          final UriQueryBuilder directoryBuilder = getDirectoryUriQueryBuilder();
          return BaseRequest.create(uri, fileOptions, directoryBuilder, opContext);
      }
docs: Constructs a web request to create a new directory. Sign with 0 length.
  
  @param uri
  A <code>java.net.URI</code> object that specifies the absolute URI.
  @param fileOptions
  A {@link FileRequestOptions} object that specifies execution options such as retry policy and timeout
  settings for the operation. Specify <code>null</code> to use the request options specified on the
  {@link CloudFileClient}.
  @param opContext
  An {@link OperationContext} object that represents the context for the current operation. This object
  is used to track requests to the storage service, and to provide additional runtime information about
  the operation.
  @return a HttpURLConnection configured for the operation.
  @throws StorageException
  @throws IllegalArgumentException