gistfile1.java

Object rawRequest = RequestCycle.get().getRequest().getContainerRequest();

if (rawRequest instanceof HttpServletRequest) {
		HttpServletRequest servletRequest = (HttpServletRequest) rawRequest;
		String proxyHost = servletRequest.getHeader("X-Forwarded-Host");
		String proxyPort = servletRequest.getHeader("X-Forwarded-Port");

		if (proxyHost != null) {
		  hostname = proxyHost;
		}

		if (proxyPort != null) {
		  port = Integer.parseInt(proxyPort);
		}
}