chenhg5/cc-connect · error

googlechat: attachment message: build request

Error message

googlechat: attachment message: build request: %w

What it means

This wraps an http.NewRequestWithContext failure while building the JSON POST that creates a Chat message referencing an uploaded attachment. NewRequest only errors on invalid URL or unsupported methods, so this almost always means the URL produced by buildAttachmentRequest is malformed.

Solutions

1. Print/log the URL produced by buildAttachmentRequest and validate it parses with url.Parse
2. Verify the API base URL configuration points at https://chat.googleapis.com/...
3. Ensure the attachmentDataRef resource name is URL-escaped before being placed in the request path

Example fix

// before
url := apiBase + rc.space + "/attachments" // raw space name
// after
url := apiBase + url.PathEscape(rc.space) + "/attachments"

if _, err := url.Parse(requestURL); err != nil || !strings.HasPrefix(requestURL, "https://") { return fmt.Errorf("invalid attachment URL: %w", err) }

if err := p.SendFile(ctx, rc, file); err != nil {
    if strings.Contains(err.Error(), "build request") {
        slog.Error("googlechat attachment URL invalid", "error", err)
    }
    return err
}

When it happens

Trigger: buildAttachmentRequest returns a URL that fails net/http URL parsing — e.g. missing/empty base API URL in configuration producing a non-absolute URL, or mis-escaped characters in the space/resource name interpolated into the path.

Common situations: Deployments overriding the Chat API base URL with a bad value; space names containing characters that break URL construction; regression in buildAttachmentRequest after a version upgrade.

Understand the failure class

Background: "Invalid URL" / "URL cannot be empty": fix the malformed or missing URL behind request-construction failures — this error's family across 50 libraries.

Related errors

• googlechat: build request
• googlechat: build request
• googlechat: build update request
• build first-chunk request
• build range request

AI-assisted analysis of chenhg5/cc-connect@4000b2338a (2026-09-06). Data as JSON: /api/errors/39d1164634b60f0e. Report an issue: GitHub.

Appendix: source

Thrown at platform/googlechat/googlechat.go:542

}

// postAttachment uploads data then creates a Chat message carrying the
// attachmentDataRef. Shared by SendImage and SendFile.
func (p *Platform) postAttachment(ctx context.Context, rc replyContext, filename, mimeType string, data []byte) error {
	if rc.space == "" {
		return fmt.Errorf("googlechat: missing space in reply context")
	}
	resourceName, err := p.uploadAttachment(ctx, rc.space, filename, mimeType, data)
	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.

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