code: def initialize_url(batch_job_url)
        headers = DEFAULT_HEADERS
        headers['Content-Length'] = 0
        headers['x-goog-resumable'] = 'start'
  
        response = AdsCommon::Http.post_response(
            batch_job_url, '', @api.config, headers)
  
        return response.headers['Location']
      end
docs: Initializes an upload URL to get the actual URL to which to upload
   operations.
  
   Args:
   - batch_job_url: The UploadURL provided by BatchJobService
  
   Returns:
   - The URL that should actually be used to upload operations.