code: def raise_from_response(resp):
      
      if resp.status_code < 400:
          # Request was successful.  Or at least, not a failure.
          return
      raise BackendError(status_code=resp.status_code,
                         reason=resp.reason,
                         content=resp.text)
docs: Turn a failed request response into a BackendError.  Handy for
      reflecting HTTP errors from farther back in the call chain.
  
      Parameters
      ----------
      resp: :class:`requests.Response`
  
      Raises
      ------
      :class:`apikit.BackendError`
          If `resp.status_code` is equal to or greater than 400.