routing-navigation-design

Secure route navigation contracts classify unauthenticated, unauthorized, unavailable, and not-found outcomes explicitly. They enforce a resource-existence disclosure policy to prevent leaking sensitive resource existence while ensuring distinct behaviors for each guard state.

Prevent open redirect vulnerabilities by enforcing same-origin validation for returnTo destinations. Route navigation contracts limit redirect depth to a maximum of 2, ensuring loop-free redirects while preserving safe return destinations across authentication flows.

Deep-link state recovery requires direct-entry URLs to implement loading, success, permission-denied, deleted or archived recovery, and never-existed 404 handling. This ensures direct-entry URLs handle stale or removed resources gracefully without breaking the navigation flow.

Routing-layer parameter validation requires strict validation of path parameters before any data fetch begins. This contract ensures invalid parameters are rejected early by the routing layer, preventing unnecessary data fetches and maintaining application stability.

Use push vs replace history semantics to avoid resubmission traps and dead-state wizard navigation. History discipline specifies exact push vs replace behavior for changed URLs, ensuring back-button resilience and preventing users from resubmitting forms or hitting dead states.

Route-level error boundary scope contains failures within affected subtrees so partial 404s or nested errors do not collapse the entire app. This approach isolates route failures, maintaining overall application stability when specific routes encounter errors.