How to use the gcsfs.utils.HtmlError function in gcsfs

m = str(r.content)
        error = None
        try:
            error = r.json()['error']
            msg = error['message']
        except json.JSONDecodeError:
            msg = str(r.content)

        if r.status_code == 404:
            raise FileNotFoundError(path)
        elif r.status_code == 403:
            raise IOError("Forbidden: %s\n%s" % (path, msg))
        elif "invalid" in m:
            raise ValueError("Bad Request: %s\n%s" % (path, msg))
        elif error:
            raise HtmlError(error)
        else:
            raise RuntimeError(m)

def _call(self, method, path, *args, **kwargs):
        for k, v in list(kwargs.items()):
            # only pass parameters that have values
            if v is None:
                del kwargs[k]
        json = kwargs.pop('json', None)
        meth = getattr(self.session, method)
        if args:
            path = path.format(*[quote_plus(p) for p in args])
        for retry in range(self.retries):
            try:
                time.sleep(2**retry - 1)
                r = meth(self.base + path, params=kwargs, json=json)
                validate_response(r, path)
                break
            except (HtmlError, RequestException, GoogleAuthError) as e:
                if retry == self.retries - 1:
                    logger.exception("_call out of retries on exception: %s", e)
                    raise e
                if is_retriable(e):
                    logger.debug("_call retrying after exception: %s", e)
                    continue
                logger.exception("_call non-retriable exception: %s", e)
                raise e
        try:
            out = r.json()
        except ValueError:
            out = r.content
        return out