to avoid connection leak (viz. #150 ) when ajax long polling is used

src/taoensso/sente/server_adapters/nginx_clojure.clj

@@ -24,6 +24,12 @@
  ;; Returns {:status 200 :body <nginx-clojure-implementation-channel>}:
  (when (not upgrade-ok?) ;; send general header for non-websocket request
  (.setIgnoreFilter nc-ch false)
+ ;; Give a chance to set client broken listener.
+ ;; Generally it can be mereged with invoking send-header! 
+ ;; e.g. (send-header! nc-ch 200, ..., true, false)
+ ;; We do not merge them here just to make its behavior be the same with 
+ ;; those of other server adapters 
+ (ncc/send! nc-ch nil true false)
  (ncc/send-header! nc-ch 200 {"Content-Type" "text/html"} false false))
  (ncc/add-aggregated-listener! nc-ch *max-message-size*
  {:on-open (when on-open (fn [nc-ch] (on-open nc-ch)))