grafana/k6 · error

clearing cookies: %w

Error message

clearing cookies: %w

What it means

Thrown by BrowserContext.ClearCookies when the CDP Storage.clearCookies command fails for this browser context. The method has no local validation; it solely reports whether Chrome accepted the command, so the wrapped error is a protocol/connection failure.

Source

Thrown at internal/js/modules/k6/browser/common/browser_context.go:513

	setCookies := storage.
		SetCookies(cookiesToSet).
		WithBrowserContextID(b.id)
	if err := setCookies.Do(cdp.WithExecutor(b.ctx, b.browser.conn)); err != nil {
		return fmt.Errorf("cannot set cookies: %w", err)
	}

	return nil
}

// ClearCookies clears cookies.
func (b *BrowserContext) ClearCookies() error {
	b.logger.Debugf("BrowserContext:ClearCookies", "bctxid:%v", b.id)

	clearCookies := storage.
		ClearCookies().
		WithBrowserContextID(b.id)
	if err := clearCookies.Do(cdp.WithExecutor(b.ctx, b.browser.conn)); err != nil {
		return fmt.Errorf("clearing cookies: %w", err)
	}
	return nil
}

// Cookies returns all cookies.
// Some of them can be added with the AddCookies method and some of them are
// automatically taken from the browser context when it is created. And some of
// them are set by the page, i.e., using the Set-Cookie HTTP header or via
// JavaScript like document.cookie.
func (b *BrowserContext) Cookies(urls ...string) ([]*Cookie, error) {
	b.logger.Debugf("BrowserContext:Cookies", "bctxid:%v", b.id)

	// get cookies from this browser context.
	getCookies := storage.
		GetCookies().
		WithBrowserContextID(b.id)
	networkCookies, err := getCookies.Do(
		cdp.WithExecutor(b.ctx, b.browser.conn),

View on GitHub (pinned to 93accf6570)

Solutions

1. Call clearCookies only while the context is open, before context.close()/browser.close().
2. Treat 'Target closed'/'disconnected' wrapped errors as benign during teardown and skip retrying.
3. Enable debug logging to capture the underlying CDP error if the failure is persistent.

Example fix

// before
// ... in teardown, after browser already closed:
context.clearCookies(); // throws

// after
context.clearCookies();
context.close();

try {
  context.clearCookies();
} catch (e) {
  if (/Target closed|disconnected/.test(e.message)) {
    // teardown race: context already gone, safe to ignore
  } else {
    throw e;
  }
}

When it happens

Trigger: Calling browserContext.clearCookies() after the context (or the whole browser) has been closed, or while the CDP websocket to the browser is broken; occasionally when the browser is mid-shutdown during test teardown.

Common situations: Cleanup code running in a finally/teardown path after the browser already closed; test abort racing the clearCookies call; CI containers killing Chrome on timeout before cleanup finishes.

Related errors

• retrieving cookies: %w
• disposing browser context: %w
• cannot set cookies: %w
• adding k6 object to new browser context: %w
• browser connect: %w

AI-assisted analysis of grafana/k6@93accf6570 (2026-08-15). Data as JSON: /api/errors/477aadfead88e24a. Report an issue: GitHub.