chenhg5/cc-connect · error

wecom: decode upload response: %w

Error message

wecom: decode upload response: %w

What it means

JSON parse failure on the /cgi-bin/media/upload response: the server responded but the body is not the expected {errcode, errmsg, media_id} JSON — commonly an HTML gateway error page, a truncated response, or an intermediate proxy response.

Source

Thrown at platform/wecom/wecom.go:579

	}

	apiURL := p.wecomAPIURL("/cgi-bin/media/upload", url.Values{
		"access_token": []string{accessToken},
		"type":         []string{"image"},
	})
	resp, err := p.apiClient.Post(apiURL, writer.FormDataContentType(), body)
	if err != nil {
		return "", fmt.Errorf("wecom: upload image: %w", err)
	}
	defer resp.Body.Close()

	var result struct {
		ErrCode int    `json:"errcode"`
		ErrMsg  string `json:"errmsg"`
		MediaID string `json:"media_id"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return "", fmt.Errorf("wecom: decode upload response: %w", err)
	}
	if result.ErrCode != 0 {
		return "", fmt.Errorf("wecom: upload image failed: %d %s", result.ErrCode, result.ErrMsg)
	}
	if result.MediaID == "" {
		return "", fmt.Errorf("wecom: upload image: empty media_id")
	}
	return result.MediaID, nil
}

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

func (p *Platform) sendMarkdown(accessToken, toUser, content string) error {
	payload := map[string]any{
		"touser":   toUser,
		"msgtype":  "markdown",
		"agentid":  p.agentID,
		"markdown": map[string]string{"content": content},

View on GitHub (pinned to 4000b2338a)

Solutions

1. Capture and log the raw body prefix to identify the non-JSON payload
2. Retry once; transient gateway responses often clear immediately
3. Check proxy/WAF interference on the API host

When it happens

Trigger: Thrown at platform/wecom/wecom.go:579 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/a3fd8663da71943c. Report an issue: GitHub.