In a dispatched non-blocking HttpRequest handler I'm calling endExchange immediately after calling send on the response Sender. I am unsure if this will cause the sender to be interrupted or if the exchange will end only after the sender is done writing the data. The code looks like this: @Override public void handleRequest(HttpServerExchange exchange) throws Exception { if (exchange.isInIoThread()) { exchange.dispatch(this); return; } try { ... do things ... exchange.getResponseSender().send(data); }finally { exchange.endExchange(); } }