Cross-Platform SSR and Server Fragment IPC Pipeline Shows InertiaResponse and FragmentEngine guarded by SSRCircuitBreaker dispatching IPCRequest frames over TCPStreamIPCTransport (POST /__litestar_ssr__ to Vite 7 ServerModuleRunner in dev) or StdioIPCTransport (NDJSON over stdin/stdout with concurrent stderr ring buffer in prod), followed by _InertiaSlots HTML splicing and <litestar-island> hydration. Litestar SSR & Fragments InertiaResponse / FragmentEngine SSRCircuitBreaker CLOSED → OPEN → HALF_OPEN CSR fallback on timeout/error BaseIPCTransport.request() Development IPC: TCPStreamIPCTransport POST /__litestar_ssr__ Vite ServerModuleRunner execution Production IPC: Stdio / Wasm startSsrWorker • QuickJS NDJSON stdio pipes or in-process WASM HTML Splicing & Islands _InertiaSlots Parser Right-to-left offset splicing head[] + body into shell <litestar-island> hydrateIslands() custom element Preserves SSR DOM on teardown