chenhg5/cc-connect · warning

googlechat: drain attachment create response body: %w

Error message

googlechat: drain attachment create response body: %w

What it means

After the attachment-create POST succeeds at the transport level, the platform drains the response body with io.Copy(io.Discard, ...). If reading the body fails (connection reset mid-response, context cancellation, TLS error), the body is closed and this wrapped error is returned.

Source

Thrown at platform/googlechat/googlechat.go:551

	if err != nil {
		return err
	}
	url, body, err := buildAttachmentRequest(rc, resourceName)
	if err != nil {
		return err
	}
	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(body))
	if err != nil {
		return fmt.Errorf("googlechat: attachment message: build request: %w", err)
	}
	req.Header.Set("Content-Type", "application/json")
	resp, err := p.doRequest(req)
	if err != nil {
		return err
	}
	if _, err := io.Copy(io.Discard, resp.Body); err != nil {
		_ = resp.Body.Close()
		return fmt.Errorf("googlechat: drain attachment create response body: %w", err)
	}
	if err := resp.Body.Close(); err != nil {
		return fmt.Errorf("googlechat: close attachment create response body: %w", err)
	}
	return nil
}

// SendImage uploads an image and posts it as a Chat message attachment.
// Implements core.ImageSender.
func (p *Platform) SendImage(ctx context.Context, rctx any, img core.ImageAttachment) error {
	rc, ok := rctx.(replyContext)
	if !ok {
		return fmt.Errorf("googlechat: SendImage: invalid reply context type %T", rctx)
	}
	return p.postAttachment(ctx, rc,
		coalesce(img.FileName, "image.png"),
		coalesce(img.MimeType, "image/png"),
		img.Data)

View on GitHub (pinned to 4000b2338a)

Solutions

1. Retry the postAttachment call — the error is transient network-level
2. Check proxy/firewall stability between the host and chat.googleapis.com
3. Avoid cancelling the context while attachment sends are in flight

if err := p.SendImage(ctx, rc, img); err != nil {
    if isTransientNetwork(err) { return retryWithBackoff(ctx, 3, func() error { return p.SendImage(ctx, rc, img) }) }
    return err
}

When it happens

Trigger: The Google Chat API connection drops while the response body is still being read; the request context is cancelled between receiving headers and draining the body.

Common situations: Unstable networks or proxies closing keep-alive connections early; callers cancelling the context during a slow upload; corporate proxies truncating responses.

Related errors

• googlechat: drain response body: %w
• googlechat: close response body: %w
• googlechat: send preview: %w
• range chunk retries exhausted
• request usage endpoint: %w

AI-assisted analysis of chenhg5/cc-connect@4000b2338a (2026-09-06). Data as JSON: /api/errors/8ac55779d878a50f. Report an issue: GitHub.