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User Authenticate problem

 
zheng yu
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We built a server using Apche + Linux + tomcat3.2 .We use HTTP Basic Authentication technology within HTTP Protocol( that means using HTTP Realm Tag and sends pasword with base64 coding ) . In server side , if the user/password is not correct , we wrote some code showed as following in servlet's service()function
res.setHeader("WWW-Authenticate", "BASIC realm=\"Lib adminis
trator\"");
res.sendError(HttpServletResponse.SC_UNAUTHORIZED);
But what's really strange is that in client side , this code doesn't pop out some windows to allow user to input user name /password .the browser is redirect to Tomcat's JSP sample Security/login.jsp that come with Tomcat3.2.1
Is there some explanation for this ?Please tell me why and how to solve this problem ?
Thanx in advance
ZY
 
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