[undertow-dev] Sender not flushing?

I've got a fairly simplistic scenario (using 1.4.6.Final) where I'm building an HTML String and then sending it to my exchange: exchange.getResponseHeaders.put(Headers.CONTENT_LENGTH, html.length) exchange.getResponseHeaders.put(Headers.CONTENT_TYPE, "text/html") exchange.getResponseSender.send(html) However, very often the last one to three characters don't seem to be received by the browser. I've logged the HTML before outputting so I know that I'm adding the "</html>" at the end, but in order to get everything properly to the browser I have to append a few spaces to the end of my HTML so it doesn't get clipped. Is there something I'm missing that needs to be done to make sure the content is flushed appropriately?