It's correct as @alex-suter said, we have to declare the asynchronous to our filter and servlet inside web.xml of designer/engine. Besides, we have to add the library atmosphere `atmosphere-runtime-2.4.21.jar` to the `WEB-INF/lib` folder. https://pastebin.com/Ajs69XEe -> Sorry I dont know how to markup xml file here We need to add `async-supported` tag as `true` to the PrimePush servlet configuration and also to the filter that ivy already stated in the `web.xml` file.

It's correct as @alex-suter said, we have to declare the asynchronous to our filter and servlet inside web.xml of designer/engine. Besides, we have to add the library atmosphere to the `WEB-INF/lib` folder. https://pastebin.com/Ajs69XEe -> Sorry I dont know how to markup xml file here We need to add `async-supported` tag as `true` to the PrimePush servlet configuration and also to the filter that ivy already stated in the `web.xml` file.