[plt-scheme] cookies and redirect

Does anyone have an example of a simultaneous redirect + setcookie using PLT
scheme?

I tried:

(make-response/full 303 "See Other"
                              (current-seconds)
                              #"text/html"
                              `((location . ,url)
                                ,(make-session-id-cookie session-id))
                              (list
                               (xexpr->string
                                ...
)))


The redirect works fine but no cookie is apparent.

-pp
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