}

	if currentReleaseTime.IsZero() || currentReleaseTime.Equal(timeSentinel) {
		apiErr := errorCodes.ToAPIErr(ErrMethodNotAllowed)
		apiErr.Description = fmt.Sprintf("unable to perform in-place update, release time is unrecognized: %s", currentReleaseTime)
		writeErrorResponseJSON(ctx, w, apiErr, r.URL)
		return
	}

	vars := mux.Vars(r)
	updateURL := vars["updateURL"]
	dryRun := r.Form.Get("dry-run") == "true"

            metadata.type = TF_ATTR_FUNC;
          } else {
            status->status = InvalidArgument(
                "Attribute '", attr_name,
                "' has an empty value of an unrecognized type '", typestr, "'");
            return metadata;
          }
        }
      }
      break;

    case tensorflow::AttrValue::kPlaceholder:
      metadata.is_list = 0;

	response, err = s.client.Do(request)
	c.Assert(err, nil)
	c.Assert(response.StatusCode, http.StatusPreconditionFailed)

	// make HTTP request to obtain object info.
	// But this time set a date with unrecognized format to the "If-Modified-Since" header
	request, err = newTestSignedRequest(http.MethodHead, getHeadObjectURL(s.endPoint, bucketName, objectName),
		0, nil, s.accessKey, s.secretKey, s.signer)
	c.Assert(err, nil)