code: def _fetch_remote_file(service_url, params=None, use_http_post=False):
      
      if not params:
          params = {}
  
      request_url, response = _fetch_remote(service_url, params, use_http_post)
      dummy, params = cgi.parse_header(
              response.headers.get('Content-Disposition', ''))
      fn = params['filename']
  
      return (response.headers.get('content-type'),
              fn, response.read(), response.geturl())
docs: Retrieves a file from a URL.
  
      Returns a tuple (mimetype, filename, data)