@orangy: looks like you are still building low level layers below my threshold of giving feedback (I'm not looking to replace below Undertow/Vert.x level obviously). So I'll generalize my REST binder to make it work on those two frameworks and put it out since there is a lot of nice vert.x helper code in there that people can use. See what ideas from the REST binder that you like. It tries to be invisible, but at the cost that some people won't like not being able to customize or tweak it. But with the benefit is that it makes your code feel Kotlin-like and not web-framwork-like.