start-server-core

You can handle server-side requests and sessions in TanStack Start by configuring a dedicated server entry with createStartHandler. This provides request/response utilities like getRequest, setCookie, and useSession to safely manage data within a request lifecycle.

The best way to structure SSR and server functions in TanStack Start is using a three-phase workflow: server function dispatch, server route handling, and app SSR. This approach ensures cohesive server-side runtime execution.

Yes, you need AsyncLocalStorage context to manage request context in TanStack Start. It is required to safely propagate per-request data across the server function dispatch, route handling, and SSR phases.

Yes, you can set response headers and cookies during server route handling in TanStack Start. The runtime provides dedicated utilities like setResponseHeader and setCookie to manipulate the response before the app SSR phase.

You use server-only imports for TanStack Start server functions to ensure code operates safely within the request lifecycle. Importing server-side runtime packages directly prevents leaking sensitive server logic to the client during the app SSR phase.