@FunctionalInterfaceSE public interface NettyRouteProvider extends FunctionSE<reactor.netty.http.server.HttpServerRoutes,reactor.netty.http.server.HttpServerRoutes>
HttpServerRoutes インスタンスに新しいルートを追加できる機能。NettyReactiveWebServerFactoryandThenSE, applySE, composeSE, identitySE