grafana/k6 · error

performing request: %w

Error message

performing request: %w

What it means

Raised in requestPresignedURL when httpClient.Do fails while POSTing the JSON body to the presigned-URL endpoint (10s timeout applies). This is the transport failure of obtaining the upload target: DNS resolution failure, connection refused, TLS handshake error, or timeout — distinct from a non-2xx response, which is reported separately by checkStatusCode.

Source

Thrown at internal/js/modules/k6/browser/storage/file_persister.go:147

	}

	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)
}

func buildPresignedRequestBody(basePath, path string) ([]byte, error) {
	b := struct {
		Service   string `json:"service"`
		Operation string `json:"operation"`
		Files     []struct {
			Name string `json:"name"`
		} `json:"files"`
	}{

View on GitHub (pinned to 01ffac6f24)

Solutions

1. Verify network connectivity, DNS, and proxy configuration to the cloud endpoint
2. Retry the request; transient network errors are expected during load tests
3. Check TLS/CA configuration if handshakes fail in restricted environments
4. Confirm the endpoint is reachable and not blocked by firewall rules

When it happens

Trigger: Thrown at internal/js/modules/k6/browser/storage/file_persister.go:147 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/c3a8422113873a49. Report an issue: GitHub.