How do I add cookies?

I tried adding io.pedestal.http.ring-middlewares/cookies interceptor and then adding :cookies field to response:

{:status 200
       :cookies {"a" {:value ""}
                 "b" {:value ""}
                 "c" {:value ""}}

And also:

(def set-some-cookies-interceptor
  (fn [request]
    {:status 200
     :headers {"Set-Cookie" "a=; b=;"}})))

FYI this works:

{:headers {"Set-Cookie" ["a=; path=/;" "b=; path=/;"]}}

Thanks to MDN 😄