> In the Rack middleware in the chain, each piece of the middleware receives a > hash which encapsulates the response/requests, and the middleware mutates > this hash depending on the functionality it adds.
Could each middleware layer return the updated hash value? Racket has
functional hash tables alongside mutable ones.
http://docs.racket-lang.org/reference/hashtables.html#(def._((quote._~23~25kernel)._hash-set))
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