chenhg5/cc-connect · error

download failed with status %d: %s

Error message

download failed with status %d: %s

What it means

downloadSlackFile: non-200 response — often a redirect to a login page when the Bearer authorization header was missing or rejected; the first 1KB of the body is embedded so HTML login pages are visible in the error.

Source

Thrown at platform/slack/slack.go:577

var _ core.FileSender = (*Platform)(nil)

func (p *Platform) downloadSlackFile(url string) ([]byte, error) {
	if url == "" {
		return nil, fmt.Errorf("empty URL")
	}
	req, _ := http.NewRequest("GET", url, nil)
	req.Header.Set("Authorization", "Bearer "+p.botToken)
	resp, err := core.HTTPClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("%s", core.RedactToken(err.Error(), p.botToken))
	}
	defer resp.Body.Close()

	// Check if we got an unexpected status code (e.g., redirect to login page)
	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(io.LimitReader(resp.Body, 1024))
		return nil, fmt.Errorf("download failed with status %d: %s", resp.StatusCode, string(body))
	}

	data, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("read response body: %w", err)
	}

	// Basic sanity check: detect if we received HTML instead of binary data
	if len(data) > 0 && (bytes.HasPrefix(data, []byte("<!DOCTYPE")) || bytes.HasPrefix(data, []byte("<html"))) {
		return nil, fmt.Errorf("received HTML response (likely missing auth); first 100 bytes: %s", string(data[:min(100, len(data))]))
	}

	return data, nil
}

func (p *Platform) ReconstructReplyCtx(sessionKey string) (any, error) {
	// slack:{channel}:{user}  |  slack:{channel}:t:{threadTS}  |  slack:{channel}
	parts := strings.SplitN(sessionKey, ":", 3)

View on GitHub (pinned to 4000b2338a)

Solutions

1. Ensure the 'Bearer '+botToken header is sent
2. Check the token has files:read scope

When it happens

Trigger: Thrown at platform/slack/slack.go:577 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of chenhg5/cc-connect@4000b2338a (2026-09-06). Data as JSON: /api/errors/436868723fc10f3f. Report an issue: GitHub.