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                    var url = "login.jsp?user=XXX&pwd=XXX";
                    xmlHttpRequest.open("GET",url,true);
                    xmlHttpRequset.send(null);
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                   xmlHttpRequest.open("POST","login.jsp",true);
                   xmlHttpRequest.setRequestHeder("Content-Type","application/x-www-form-urlencoded;charset=UTF-8");
                   xmlHttpRequest.send("user="+username+"&pwd="+password);
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