Hi all,

I discovered a problem during coding Google WebToolkit together with
appengine and according to my interpretation of my tests it's the
appengine part of it, which causes the problem. or the development
server of it.
I tried to follow the article
http://code.google.com/intl/de-DE/webtoolkit/articles/security_for_gwt_applications.html
and implement a server cookie to compare it with the its content sent
via RPC. To get access to the cookies I overlayed the service method.

protected void service(HttpServletRequest hreq, HttpServletResponse
hres)
                        throws IOException, ServletException {
                req = hreq;
                Cookie[] cookies = req.getCookies();
                if (cookies != null) {
                        for (int i = 0; i < cookies.length; i++) {
                                if (cookies[i] != null
                                                && 
"MYCOOKIEID".equals(cookies[i].getName())) {
                                        sessionClient = cookies[i].getValue();
                                }
                        }
                }

                super.service(hreq, hres);

                if (sessionServer != null) {
                        Cookie cookie = new Cookie("MYCOOKIEID", "" + 
sessionServer);
                        cookie.setComment("Session-Cookie for 
myapp.example.com");
                        // cookie.setPath("/");
                        cookie.setMaxAge(-1);
                        hres.addCookie(cookie);
                }
        }

This is working as long as I don't try to use the login capability as
described in
http://code.google.com/intl/de-DE/webtoolkit/doc/latest/tutorial/appengine.html#user

Once logged in there is a cookie named "dev_appserver_login",
my cookie, which was working without login, seems to vanish on the
server side of the development server.

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