// But for now any three digits.
	//
	// We used to send "HTTP/1.1 000 0" on the wire in responses but there's
	// no equivalent bogus thing we can realistically send in HTTP/2,
	// so we'll consistently panic instead and help people find their bugs
	// early. (We can't return an error from WriteHeader even if we wanted to.)
	if code < 100 || code > 999 {
		panic(fmt.Sprintf("invalid WriteHeader code %v", code))
	}

    *   TensorBoard uses a relative data directory, for easier embedding.
    *   TensorBoard automatically ignores outliers for domain calculation, and
        formats proportional values consistently.
*   Multiple tfdbg bug fixes:
    *   Fixed Windows compatibility issues.
    *   Command history now persists across runs.
    *   Bug fix in graph validation related to `tf.while_loops`.