UDP support

Co-authored-by: Julien Salleyron <julien.salleyron@gmail.com>

pkg/udp/handler.go

@@ -0,0 +1,14 @@
+package udp
+
+// Handler is the UDP counterpart of the usual HTTP handler.
+type Handler interface {
+	ServeUDP(conn *Conn)
+}
+
+// The HandlerFunc type is an adapter to allow the use of ordinary functions as handlers.
+type HandlerFunc func(conn *Conn)
+
+// ServeUDP implements the Handler interface for UDP.
+func (f HandlerFunc) ServeUDP(conn *Conn) {
+	f(conn)
+}