If you're looking to use Elder.js with express/polka to build a server rendered website, then you'll be interested in this hook as it includes the familiar 'req' and 'next' objects as often used in Express middleware.

• Under the hood Elder.js uses this hook to power the server implementation.
• If you want to change the route of a request, you can do so by modifying the 'request.route' to the name of the new request, and it will be picked up by the default Elder.js server.
• If you're looking to set user or session information stored on the 'req' prop we recommend using a hook to modify the 'request' object or 'data' objects. Change to the request object will be passed down.
• If you're looking to pass in details about the query string deeper into your application, you could use this hook to do so.
• Anything you'd use an Express 'req' or 'next' for you can do and customize other parts of the Elder.js on this hook.