XTLS/Xray-core · error · errors.Error

failed to write back OK response

Error message

failed to write back OK response

What it means

Error "failed to write back OK response" thrown in XTLS/Xray-core.

Source

Thrown at proxy/http/server.go:179

	}

	keepAlive := (strings.TrimSpace(strings.ToLower(request.Header.Get("Proxy-Connection"))) == "keep-alive")

	err = s.handlePlainHTTP(ctx, request, conn, dest, dispatcher)
	if err == errWaitAnother {
		if keepAlive {
			goto Start
		}
		err = nil
	}

	return err
}

func (s *Server) handleConnect(ctx context.Context, _ *http.Request, buffer *bufio.Reader, conn stat.Connection, dest net.Destination, dispatcher routing.Dispatcher, inbound *session.Inbound) error {
	_, err := conn.Write([]byte("HTTP/1.1 200 Connection established\r\n\r\n"))
	if err != nil {
		return errors.New("failed to write back OK response").Base(err)
	}

	reader := buf.NewReader(conn)
	if buffer.Buffered() > 0 {
		payload, err := buf.ReadFrom(io.LimitReader(buffer, int64(buffer.Buffered())))
		if err != nil {
			return err
		}
		reader = &buf.BufferedReader{Reader: reader, Buffer: payload}
		buffer = nil
	}

	if inbound.CanSpliceCopy == 2 {
		inbound.CanSpliceCopy = 1
	}
	if err := dispatcher.DispatchLink(
		ctx, dest, &transport.Link{
			Reader: reader,

View on GitHub (pinned to 7d214f8b09)

When it happens

Trigger: Thrown at proxy/http/server.go:179 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of XTLS/Xray-core@7d214f8b09 (2026-08-15). Data as JSON: /api/errors/ec81e56ff3b0df0d. Report an issue: GitHub.