Exactly!The included file has no permission to change the headers,and other things.Caze the included file like a part of his parent.The parent control all of the http headers and cookies.<jsp:include page="shoppingcart.jsp" flush="true"/>
This line will be translate to JspRuntimeLibrary.include(request, response, "shoppingcart.jsp", out, true);
This line will be translate to JspRuntimeLibrary.include(request, response, "shoppingcart.jsp", out, true);
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