code: @Override
      public void deleteAttachment(final String assetId, final String attachmentId) throws IOException, RequestFailureException {
          HttpURLConnection connection = createHttpURLConnectionToMassive("/assets/"
                                                                          + assetId + "/attachments/" + attachmentId);
          connection.setRequestMethod("DELETE");
          testResponseCode(connection, true);
      }
docs: Delete an attachment from an asset
  
  @param assetId
  The ID of the asset containing the attachment
  @param attachmentId
  The ID of the attachment to delete
  @return <code>true</code> if the delete was successful
  @throws IOException
  @throws RequestFailureException