}

			okSt := (ci.StatusCode == http.StatusOK || ci.StatusCode == http.StatusPartialContent ||
				ci.StatusCode == http.StatusPreconditionFailed || ci.StatusCode == http.StatusNotModified)
			if okSt {
				ci.WriteHeaders(w, func() {
					// set common headers
					setCommonHeaders(w)
				}, func() {
					okSt := (ci.StatusCode == http.StatusOK || ci.StatusCode == http.StatusPartialContent)
					if okSt && len(ci.Data) > 0 {