start

fun start(el: String, clazz: Class<Req>): ServerStreamStartActionBuilder<Req, Res>
fun start(body: Req): ServerStreamStartActionBuilder<Req, Res>
fun start(f: Function<Session, Req>): ServerStreamStartActionBuilder<Req, Res>
inline fun start(crossinline f: (Session) -> Req): ServerStreamStartActionBuilder<Req, Res>