[racket] WebServer memory and custom expiration page

A couple of minor question about page expiring too fast.

How does one assign more memory to WebServer (with State)? (I am
guessing this delays expiration. Please correct me if I am wrong.) I
read something about Continuation Managers but not clear how to create
one and how to use it with serve/servlet.

Also, when the page does expire, I'd like to provide a link to a place
where user can go back (instead of keep pressing back buttons many
times.) Do I edit some page under collects or pass a lambda to
serve/servlet (as in the recent thread about statless/stuffer)?

Regards,

jGc