docs: def request(self, url, extra_headers=None, params=None):
          'Make a GET request for url, with or without caching'
          if not url.startswith('http'):
              # relative url
              url = self.rootpath + url
          log.debug("getting url: %r, extra_headers=%r, params=%r", url, extra_headers, params)
          if extra_headers is None: extra_headers={}
          r = self.session.get(url, headers=extra_headers, params=params, timeout=1800) #max retries is set in __init__
  
          if r.status_code in ( 500, ):
              raise JFSError(r.reason)
          return r