don't empty the real array, duh

lib/modules/http.js

@@ -202,10 +202,12 @@ module.exports.create = function (deps, conf, greenlockMiddleware) {
       socket.end();
     }
 
+    var prs = proxyRoutes.slice();
     function proxyWs() {
-      var proxyRoute = proxyRoutes.shift();
+      var proxyRoute = prs.shift();
       if (!proxyRoute) {
         socket.end();
+        return;
       }
       proxyRoute.ws(req, socket, head, proxyWs);
     }