@Override public void start() throws Exception { HttpServer server = vertx.createHttpServer(); server.requestStream().toFlowable().subscribe(req -> { HttpServerResponse resp = req.response(); String contentType = req.getHeader("Content-Type"); if (contentType != null) { resp.putHeader("Content-Type", contentType); } resp.setChunked(true); req.toFlowable().subscribe( resp::write, err -> {}, resp::end ); }); server.listen(8080); } }