chenhg5/cc-connect · error

marshal request: %w

Error message

marshal request: %w

What it means

getDownloadURL wraps a json.Marshal failure of the request body {downloadCode, robotCode}. With a plain map[string]string this is nearly impossible at runtime (map[string]string always marshals), so encountering it indicates an unexpected marshalling defect; it exists to preserve the error chain.

Source

Thrown at platform/dingtalk/dingtalk.go:686

		mimeType = "audio/amr" // Default to AMR if not specified
	}

	return data, mimeType, nil
}

func (p *Platform) getDownloadURL(downloadCode string) (string, error) {
	token, err := p.getAccessToken()
	if err != nil {
		return "", fmt.Errorf("get access token: %w", err)
	}

	reqBody := map[string]string{
		"downloadCode": downloadCode,
		"robotCode":    p.robotCode,
	}
	bodyBytes, err := json.Marshal(reqBody)
	if err != nil {
		return "", fmt.Errorf("marshal request: %w", err)
	}

	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()
	req, err := http.NewRequestWithContext(ctx, http.MethodPost,
		"https://api.dingtalk.com/v1.0/robot/messageFiles/download",
		bytes.NewReader(bodyBytes))
	if err != nil {
		return "", fmt.Errorf("create request: %w", err)
	}

	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("x-acs-dingtalk-access-token", token)

	resp, err := p.httpClient.Do(req)
	if err != nil {
		return "", fmt.Errorf("do request: %w", err)
	}

View on GitHub (pinned to 4000b2338a)

Solutions

1. Confirm you are running an unmodified build of the platform package.
2. If reproducible, report a bug with the full wrapped error chain; the request body is a fixed map[string]string and cannot normally fail.
3. No user-side configuration change can prevent this; treat as an internal invariant violation.

if err != nil && strings.Contains(err.Error(), "marshal request") {
    // Should be unreachable; treat as a bug
    log.Error("dingtalk: internal marshal failure", "err", err)
    return fmt.Errorf("internal error, please report: %w", err)
}

When it happens

Trigger: json.Marshal(reqBody) returned an error in getDownloadURL before issuing the HTTP request.

Common situations: In practice: should never occur with the current request shape. If seen, it points to a modified/broken build or an unexpected runtime fault rather than user configuration.

Understand the failure class

Background: json.Marshal / "failed to marshal" errors in Go: why "unsupported type" happens and how to fix it — this error's family across 22 libraries.

Related errors

• marshal payload: %w
• decode response: %w
• dingtalk: marshal emotion request: %w
• dingtalk: marshal image message: %w
• dingtalk: marshal file message: %w

AI-assisted analysis of chenhg5/cc-connect@4000b2338a (2026-09-06). Data as JSON: /api/errors/134ee1157c02f638. Report an issue: GitHub.