triggering servlet on GET parameters

Hi,

I'm fooling around with #lang web-server/insta, and I can serve .html files
by setting (static-files-path page-root), but I'd like to trigger my
servlet if there is a '?action=edit' parameter set.

e.g
https://localhost/start.html just serves the file (I can do this!)
https://localhost/start.html?action=edit  calls my servlet (I can't work
out how to do this :( )

(There is a lot of documentation but I'm a beginner with webdev so don't
know where to look)

Kind regards

Stephen

PS the project is a scribble based wiki. If you create a new page you enter
raw scribble/manual in a form (my servlet) and it gets saved in a folder
and transformed into html that is served directly by (static-files-path
page-root), the conversion from raw scribble goes like this:
(require raco/all-tools)
(define raco-scribble-spec (hash-ref (all-tools) "scribble"))
;;scribble-to-html : source target body
;; generate html file from scribble file
(define (scribble-to-html source target) ;-> list of strings
  (parameterize ([current-command-line-arguments (vector "--html" source)]
                 [current-directory target])
    (dynamic-require (cadr raco-scribble-spec) #f)))

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