gofiber/fiber · error

failed to reset session: %w

Error message

failed to reset session: %w

What it means

Returned by getSession when AbsoluteTimeout is configured and the session has expired (sess.isAbsExpired()): Fiber calls sess.Reset() which deletes the old session from storage, and the storage Delete fails. The session is logically dead but the store (Redis/DB/memcache) rejected the delete.

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 9a4c7e57fe)

Solutions

1. Verify storage backend health and connectivity (Redis/DB reachable, not saturated).
2. Ensure the request context is not being canceled early by a client disconnect before the delete completes.
3. Handle the error by returning 5xx or regenerating a fresh session id.

Example fix

// ensure the context used for reset is request-scoped and not prematurely canceled
ctx := c.Context()
if err := storage.DeleteWithContext(ctx, oldID); err != nil {
    log.Errorf("storage delete failed during reset: %v", err)
}

sess, err := store.Get(c)
if err != nil {
    // Reset/storage hit a transient error: fall back to a fresh session.
    log.Warnf("session reset failed, serving fresh session: %v", err)
    // surface as recoverable, let middleware regenerate
    return fiber.ErrInternalServerError
}

When it happens

Trigger: Configuring Config.AbsoluteTimeout, then on a request whose session crossed the absolute deadline the storage backend errors on DeleteWithContext (connection lost, timeout, permission error, or the request context was canceled).

Common situations: Storage backend briefly down or saturated during a session-expiry reset; network partition; rotated credentials; client disconnect canceled the request context mid-delete.

Related errors

• file: failed to store file
• session ID cannot be empty
• session ID not found in session store
• cache: failed to get key %q from storage: %w
• cache: failed to get raw key %q from storage: %w

AI-assisted analysis of gofiber/fiber@9a4c7e57fe (2026-08-04). Data as JSON: /data/errors/a258e46af978e9bc.json. Report an issue: GitHub.