http header and cookie case sensitive

Hi All,
Can anybody tell me, whether the http headers and cookie names are case sensitive or not?

No they are not

Yes they are!

I had to rename all Cookie references to Kookie, so you must rename all Kookie's back to Cookie again to be able to run this code! That was the only way I could post the code!

Try to run this servlet:

package nl.johanpelgrim.scwcd.sandbox.servlets;
 
import java.io.IOException;
 
import javax.servlet.ServletException;
import javax.servlet.http.Kookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
public class KookieCaseSensitiveTestServlet extends HttpServlet {
    
private static final long serialVersionUID = 6828947846164230597L;
 
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Kookie kookie = new Kookie("TeSt","TeSt-value");
        response.addKookie(kookie);
        kookie = new Kookie("test","test-value");
        response.addKookie(kookie);
        kookie = new Kookie("TEST","TEST-value");
        response.addKookie(kookie);
        kookie = new Kookie("TEST","Overridden TEST-value");
        response.addKookie(kookie);
        response.sendRedirect(response.encodeURL(request.getContextPath()) + "/listKookies.jsp");
    }
 
}

With this listKookies.jsp-page:

Output:

Oops, HTTP header names are case-insensitive.