So I have been thinking a bit about how to handle different request types in a consistent manner. In particular, at the moment we have the following types of request: - Native non-blocking - Native blocking - Servlet blocking This makes it very hard to write handlers that are re-usable by all three request types, for example if we want to write some code that handles web socket upgrades we will need three separate slightly different implementations. To get around this in web sockets I added the following SPI interface: https://github.com/undertow-io/undertow/blob/master/websockets/src/main/j... This abstracts away the details of the underling request, and makes it possible to write a handler that deals with all three cases consistently. Unless anyone objects, I am going to look at moving this concept into undertow core, to hopefully make it easier to write generic handlers that are usable for all request types. Stuart