This comment is just a note to understand where the problem is: we're…

… not setting the buffer status properly and we do need to finish the session!

lib/sockjs/session.rb

@@ -355,12 +355,16 @@ def send_data(frame)
     end
 
     def finish
+      p [:buffer, @buffer]
       frame = @buffer.to_frame
+      p [:frame, frame]
       self.send_data(frame)
     rescue SockJS::NoContentError => error
+      # Why there's no bloody content? That's not right, there should be a closing frame.
+      puts "~ finish: no content, setting the heartbeat timer."
       self.set_heartbeat_timer(error.buffer)
-    ensure
-      @ws.close if frame and frame.match(/^c\[\d+,/)
+    # ensure
+    #   @ws.close if frame and frame.match(/^c\[\d+,/)
     end
 
     def after_app_run
@@ -370,6 +374,10 @@ def after_app_run
     end
 
     def after_close
+      puts "~ after_close: calling #finish"
+      self.finish
+
+      puts "~ after_close: closing @ws and clearing @transport."
       @ws.close
       @transport = nil
     end