Yes—an Inertia site can return HTTP 200 while its separate server-side rendering (SSR) process is unavailable. In the Laravel adapter 3.x, SSR failures fall back to client-side rendering by default unless you enable throw_on_error. A 200 means the HTTP request succeeded; it does not prove SSR produced the page.
Why the site can return 200 when SSR is down
Inertia SSR runs in a separate background rendering service. The web application can still handle a request if that service cannot render: the Laravel adapter’s documented default is to fall back to client-side rendering. The adapter configuration states, “When SSR rendering fails, Inertia gracefully falls back to client-side rendering.” Inertia Laravel adapter 3.x configuration
HTTP status and rendering mode describe different things. Inertia’s protocol documentation shows HTTP 200 responses for both initial HTML requests and Inertia JSON visits. The status alone therefore cannot tell you whether the SSR service participated. Inertia protocol documentation
How to check whether SSR is available
Run the Laravel availability check
For Laravel, run php artisan inertia:check-ssr in the deployed application environment. Inertia’s v2 SSR guide documents this command as an availability check and notes it can be used as a Docker health check. Check your installed adapter version before relying on commands from a versioned guide. Inertia v2 server-side rendering guide
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Check the process and deployment environment
Because SSR is a separate server, verify that the process manager starts it, can restart it after a crash or deployment, and has access to the runtime and SSR bundle. The v2 guide gives Laravel’s php artisan inertia:start-ssr and php artisan inertia:stop-ssr commands and recommends keeping the SSR process running under a monitor that can restart it.
Inspect the response body and rendered page
Look at the actual response, not just the status code. An initial request normally returns HTML; an Inertia visit carrying X-Inertia: true returns a JSON page object. If the initial HTML is only the app shell and the page appears after JavaScript runs, that is consistent with client-side rendering. Treat it as a clue, not proof: confirm against the response and the behavior of your adapter.
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Choose how SSR failures should affect requests
In the documented Laravel adapter 3.x configuration, throw_on_error defaults to false. Choose deliberately between keeping the fallback and making SSR errors visible in the request path.
| Failure behavior | Effect | Operational consideration |
|---|---|---|
| Fallback (Laravel 3.x documented default) | SSR failure falls back to client-side rendering. | Requests may continue to render, so use an independent health check and alert to detect an unavailable SSR process. |
throw_on_error |
SSR failures throw instead of silently falling back. | Failures become more visible, but can affect request availability; account for your production error handling and user impact. |
The same configuration identifies the InertiaSsrSsrRenderFailed event for application-level handling. You can listen for it to log or report an SSR failure while retaining fallback behavior. These configuration details are specific to the Laravel adapter 3.x; do not assume another adapter or version uses the same setting or event. Laravel adapter configuration
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A failed SSR render is not the same as a failed route, database operation, or application request. Fallback can preserve page availability when rendering fails, but it should not turn genuine application errors into successful responses. Inertia’s production error-handling guidance shows custom handling that preserves underlying 500 and 503 statuses and recommends a production Inertia error page. Inertia v2 error handling
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check version-specific behavior
The failure setting above is from the current Laravel adapter 3.x configuration. The deployment and health-check commands cited here are in the Inertia v2 SSR guide, which notes that v3 is now the default. Verify your installed package’s configuration and release notes before applying either to a different adapter or version.
Version differences matter: a January 7, 2022 release note for inertia-laravel@0.5.1 lists a fix for a null response after SSR server crashes. That historical fix is not evidence that every version behaves identically. Inertia Laravel 0.5.1 release note
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