[undertow-dev] Undertow 3 API Migration

I have been looking at the steps required to migrate the WildFly Elytron integration to Undertow 3 from Undertow 2. Overall it seems minimal changes are required but I was thinking if there could be an opportunity to evolve the API within Undertow 2 making migration to 3 easier in the future. One example being on SSSessionInfo we make use of the following method: - void renegotiate(HttpServerExchange exchange, SslClientAuthMode sslClientAuthMode) throws IOException; which has now been changed to: - void renegotiate(HttpServerExchange exchange, ClientAuth sslClientAuthMode) throws IOException; The first form is making use of Xnio API and the second is using Netty API. If this was deprecated in Undertow 2 and a pure Undertow variant added it could be usable both in 2 and 3. I suspect a number of the other changes breaking API compatibility could be handled in a similar way. Regards, Darran Lofthouse.