gofiber/fiber · error

failed to reset session

Error message

failed to reset session: %w

What it means

Thrown when an absolutely-expired session is being acquired and Reset() fails. ResetWithContext deletes the old session ID from Storage (Storage.DeleteWithContext) and then refreshes local state; the %w wraps the storage delete error. A failure here means the Storage backend rejected the delete, not a data-format problem.

Solutions

1. Check Storage backend health and connectivity (Redis ping, DB reachability).
2. Retry on transient errors with backoff; treat permanent errors as a storage implementation bug.
3. If using a custom Storage, ensure Delete/DeleteWithContext returns nil for a missing key.
4. Make sure the passed context has a generous enough deadline for the delete.

Example fix

// before: Reset fails because Redis is briefly unreachable
// after: retry the acquisition once the backend recovers
for i := 0; i < 3; i++ {
    sess, err = store.Get(c)
    if err == nil { break }
    time.Sleep(backoff(i))
}

// Confirm the storage backend is reachable before relying on Reset.
func storageHealthy(s Storage) bool {
    type pinger interface { Ping(context.Context) error }
    if p, ok := s.(pinger); ok {
        return p.Ping(context.Background()) == nil
    }
    return true
}

var sess *Session
for attempt := 0; attempt < 3; attempt++ {
    var err error
    sess, err = store.Get(c)
    if err == nil { break }
    if !errors.Is(err, /* transient storage sentinel */) && attempt < 2 {
        time.Sleep(time.Duration(attempt+1) * 100 * time.Millisecond)
        continue
    }
    return err
}

When it happens

Trigger: AbsoluteTimeout is configured (>0), the loaded session is past its absolute expiration, and Storage.DeleteWithContext(ctx, s.id) returns an error — backend connectivity loss, permission denial, timeout, or a buggy custom Storage implementation.

Common situations: Transient Redis/DB outage at the moment a long-lived session expires; network partition to the session store; custom Storage whose Delete returns an error on missing key; context cancellation during expiry handling.

Related errors

• cache: failed to delete cached response for key
• cache: failed to delete expired key
• cache: failed to delete key
• cache: failed to delete private response for key
• cache: failed to delete stale vary manifest

AI-assisted analysis of gofiber/fiber@a105acad6c (2026-08-11). Data as JSON: /api/errors/a258e46af978e9bc. Report an issue: GitHub.

Appendix: source

Thrown at middleware/session/store.go:189

	// Decode session data if found
	if rawData != nil {
		sess.data.Lock()
		err := sess.decodeSessionData(rawData)
		sess.data.Unlock()
		if err != nil {
			sess.mu.Unlock()
			sess.Release()
			return nil, fmt.Errorf("failed to decode session data: %w", err)
		}
	}

	sess.mu.Unlock()

	if isFresh && s.AbsoluteTimeout > 0 {
		sess.setAbsExpiration(time.Now().Add(s.AbsoluteTimeout))
	} else if sess.isAbsExpired() {
		if err := sess.Reset(); err != nil {
			return nil, fmt.Errorf("failed to reset session: %w", err)
		}
		sess.setAbsExpiration(time.Now().Add(s.AbsoluteTimeout))
	}

	return sess, nil
}

// getSessionID returns the session ID using the configured extractor.
// The extractor is provided by the shared extractors package.
//
// Parameters:
//   - c: The Fiber context.
//
// Returns:
//   - string: The session ID.
//
// Usage:
//

View on GitHub (pinned to a105acad6c)