ring-middleware-format

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https://github.com/immutant/immutant/blob/2.0.0-beta1/web/src/immutant/web/websocket.clj#L72

In Immutant websocket connection can be initialized from middleware or from standard ring handler. In former case it's possible to reorder middlewares so that r-m-f doesn't see the response from websocket middleware.

Another solution is to provide custom predicate to wrap-restful-response:

(defn serializable?
  [{:keys [websocket?] :as request} {:keys [body] :as response}]
  (when response
    (not (or
          websocket?
          (string? body)
          (instance? File body)
          (instance? InputStream body)))))