grafana/k6 · error

%q: %w

Error message

%q: %w

What it means

The innermost parse error from parseURLs: Go's url.ParseRequestURI rejected the string, and the error is formatted as "<raw-url>: <cause>". ParseRequestURI demands an absolute URI with a scheme, so relative or bare strings are refused. The raw (untrimmed) original string is shown, which makes spotting the bad character easy.

Source

Thrown at internal/js/modules/k6/browser/common/browser_context.go:679

	// the scheme is not HTTPS, unless it's localhost.
	if uri.Scheme != "https" && uri.Hostname() != "localhost" && c.Secure {
		return false
	}

	// Keep the cookie.
	return true
}

// parseURLs parses the given URLs.
// If an error occurs while parsing a URL, the error is returned.
func parseURLs(urls ...string) ([]*url.URL, error) {
	purls := make([]*url.URL, len(urls))
	for i, u := range urls {
		uri, err := url.ParseRequestURI(
			strings.TrimSpace(u),
		)
		if err != nil {
			return nil, fmt.Errorf("%q: %w", u, err)
		}
		purls[i] = uri
	}

	return purls, nil
}

View on GitHub (pinned to 93accf6570)

Solutions

1. Use absolute URLs with an explicit scheme (http/https) everywhere you pass URLs to cookies().
2. Normalize inputs: u = u.trim(); if (!/^https?:\/\//.test(u)) u = 'https://' + u;
3. Check the quoted URL in the error message for invisible characters if it looks correct.

Example fix

// before
context.cookies(['  example.com  ']); // trims to 'example.com', still no scheme -> error

// after
context.cookies(['https://example.com']);

function isParsableRequestUri(u) {
  try {
    const parsed = new URL(String(u).trim());
    return parsed.protocol === 'http:' || parsed.protocol === 'https:';
  } catch {
    return false;
  }
}
if (!urls.every(isParsableRequestUri)) throw new Error('invalid URL for cookies()');

function isAbsoluteHttpUrl(u) {
  try {
    const p = new URL(String(u).trim()).protocol;
    return p === 'http:' || p === 'https:';
  } catch {
    return false;
  }
}

When it happens

Trigger: Any URL passed to browserContext.cookies() that is not an absolute URI: 'www.example.com', '/pathonly', 'example.com/path', 'http://exa mple.com', or a string that is only whitespace after trim.

Common situations: Env-var-driven URL configuration where someone stored just the hostname; URLs scraped from page content that turn out relative; locales/typographic characters (unicode quotes, non-breaking spaces) pasted into configs.

Related errors

• filtering cookies: %w
• parsing urls: %w
• urlTemplate must contain {key} placeholder
• urlTemplate must be an absolute URL with a scheme (e.g., htt
• cookie: is null

AI-assisted analysis of grafana/k6@93accf6570 (2026-08-15). Data as JSON: /api/errors/c3ca5b2212354af8. Report an issue: GitHub.