beforeRequest in entry.server.tsx: Allow to run code before any data or component functions execute

[phuctm97]

This enables server-side request-specific initialization.

[jrestall]

Middleware should meet your needs? It gives access to the request object before any loader or action is called.

https://github.com/remix-run/react-router/blob/brophdawg11/feat-middleware/decisions/0014-context-middleware.md