Laravel ↔ Vue/React: Inertia.js Redirect and Status‑Code Interoperability

Response Behavior and Status Codes

Inertia.js is designed around a specific contract: a successful page visit requires an HTTP 200 status code and the X-Inertia header. A 302 response containing an Inertia JSON payload is non-standard behavior and should not be used as a reliable mechanism for client-side navigation.

Redirects and the redirect Key

To answer your specific questions regarding 302 responses and the redirect key:

• Client-side Handling: A 302 response with an Inertia payload should not be treated as a default client-side redirect. Because this deviates from the documented protocol, behavior varies across Vue, React, and Svelte adapters. Some may ignore the payload and follow the HTTP header, while others may fail to render the component entirely.
• Stability: The redirect key is not part of the public Inertia.js contract. Relying on it for application logic is risky, as its presence and interpretation are implementation details that are not guaranteed to remain stable across future releases.

Handling 4xx and 5xx Responses

The recommended pattern for error states is to return the appropriate HTTP status code (e.g., 403, 404, 500) along with a valid Inertia page object that renders a dedicated error component. Inertia adapters are designed to catch these statuses and render the returned error page rather than treating them as successful page transitions.

Recommended Implementation Patterns

To ensure consistent behavior across all client adapters, avoid mixing 3xx status codes with JSON bodies. Use these established patterns instead:

Goal	Laravel Implementation	Client Result
Navigate to new page	return redirect()->route('name');	Client performs a new Inertia visit to the target URL.
Render target content	return Inertia::render('Component');	Client renders the component with HTTP 200.
Show Error Page	abort(404); (configured to return Inertia)	Client renders the 404 component with HTTP 404.

Verification Steps

To verify your current environment's behavior, you can use the following scoped checks:

1. Network Inspection: Trigger a redirect in your app and confirm in Browser DevTools that the server returns a standard 302/303 redirect, which the Inertia client then follows to a final 200 OK response.
2. Core Audit: Check your node_modules/@inertiajs/core source code to see if your specific version contains logic for a redirect key; if it is not explicitly handled in the core visitor logic, it is not a supported feature.

Missing Diagnostic: To provide a more specific recommendation, please specify the version of @inertiajs/core you are using, as response handling has evolved between major versions.