public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
if ("upgrade".equals(req.getHeader("Upgrade"))) {
res.setStatus(101);
res.setHeader(
"X-Powered-By",
"Servlet/3.1 "
+ "(GlassFish Server Open Source Edition 4.0 Java/Oracle Corporation/1.7)");
res.setHeader("Upgrade", "upgrade");
res.setHeader("Connection", "Upgrade");
res.flushBuffer();
System.out.println("Upgrade OK " + req.getHeader("Upgrade"));
MyHttpUpgradeHandler handler = req.upgrade(MyHttpUpgradeHandler.class);
} else {
System.out.println("No upgrade: ");
}
}
