grafana/k6 · error

creating request: %w

Error message

creating request: %w

What it means

Raised in requestPresignedURL when http.NewRequestWithContext fails to build the POST request to the presigned-URL endpoint from the JSON body. Since the URL comes from configuration, this fires when the configured presignedURLRequestURL is not a valid/parseable URL (bad scheme, control characters) or the context is already canceled — a configuration-level failure rather than a network one.

Source

Thrown at internal/js/modules/k6/browser/storage/file_persister.go:138

	return nil
}

// requestPresignedURL will request a new presigned URL from the remote server
// and returns a [PresignedURLResponse] that contains the presigned URL details.
func (r *RemoteFilePersister) requestPresignedURL(ctx context.Context, path string) (PresignedURLResponse, error) {
	b, err := buildPresignedRequestBody(r.basePath, path)
	if err != nil {
		return PresignedURLResponse{}, fmt.Errorf("building request body: %w", err)
	}

	req, err := http.NewRequestWithContext(
		ctx,
		http.MethodPost,
		r.presignedURLRequestURL,
		bytes.NewReader(b),
	)
	if err != nil {
		return PresignedURLResponse{}, fmt.Errorf("creating request: %w", err)
	}

	for k, v := range r.headers {
		req.Header.Add(k, v)
	}

	resp, err := r.httpClient.Do(req) //nolint:gosec
	if err != nil {
		return PresignedURLResponse{}, fmt.Errorf("performing request: %w", err)
	}
	defer resp.Body.Close() //nolint:errcheck

	if err := checkStatusCode(resp); err != nil {
		return PresignedURLResponse{}, err
	}

	return readPresignedURLResponse(resp)
}

View on GitHub (pinned to 01ffac6f24)

Solutions

1. Check the cloud/presigned endpoint URL configuration for typos or invalid characters
2. Ensure the URL has a valid scheme (https://)
3. Verify the execution context is not already canceled before uploading artifacts

When it happens

Trigger: Thrown at internal/js/modules/k6/browser/storage/file_persister.go:138 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of grafana/k6@01ffac6f24 (2026-08-18). Data as JSON: /api/errors/2ece2f7d8e1aa5e6. Report an issue: GitHub.