I don’t know about the 302, but I tested the 301 on some browsers today, here the results: SCENARIO: user clicks link on domainX that points to domainA. domainA does a 301 redirect to domainB. IE8 referer when landing on domainB is: domainX (even when using InPrivate browsing and even when user opens link in … Read more
Take a look at the documentation for HttpServletRequest. In order to build the URL in your example you will need to use: getScheme() getServerName() getServerPort() getContextPath() Here is a method that will return your example: public static String getURLWithContextPath(HttpServletRequest request) { return request.getScheme() + “://” + request.getServerName() + “:” + request.getServerPort() + request.getContextPath(); }
You can and should not disable the browser back button or history. That’s bad for user experience. There are JavaScript hacks, but they are not reliable and will also not work when the client has JS disabled. Your concrete problem is that the requested page is been loaded from the browser cache instead of straight … Read more
EL 3.0 or newer If you’re already on Java EE 7 / EL 3.0, then the @page import will also import class constants in EL scope. <%@ page import=”com.example.YourConstants” %> This will under the covers be imported via ImportHandler#importClass() and be available as ${YourConstants.FOO}. Note that all java.lang.* classes are already implicitly imported and available … Read more
There is a trimWhiteSpaces directive that should accomplish this, In your JSP: <%@ page trimDirectiveWhitespaces=”true” %> Or in the jsp-config section your web.xml (Note that this works starting from servlet specification 2.5.): <jsp-config> <jsp-property-group> <url-pattern>*.jsp</url-pattern> <trim-directive-whitespaces>true</trim-directive-whitespaces> </jsp-property-group> </jsp-config> Unfortunately if you have a required space it might also need strip that, so you may need … Read more
Jun 2002: JSTL 1.0 was introduced with EL for first time. It were those ${} things which works in JSTL tags only. It is designed to call Javabean get methods. Nov 2003: JSP 2.0 was introduced and EL was moved from JSTL 1.0 to JSP 2.0 in javax.servlet.jsp.el package and it became standard EL as … Read more
You can use HTML5 SessionStorage (window.sessionStorage). You will generate a random id and save in session Storage per Browser Tab. Then each browser tab has his own Id. Data stored using sessionStorage do not persist across browser tabs, even if two tabs both contain webpages from the same domain origin. In other words, data inside … Read more
In the web development world, the term “redirect” is the act of sending the client an empty HTTP response with just a Location header containing the new URL to which the client has to send a brand new GET request. So basically: Client sends a HTTP request to some.jsp. Server sends a HTTP response back … Read more
Pure JSP comments look like this: <%– Comment –%> So if you want to retain the “=“.you could do something like: <%–= map.size() –%> The key thing is that <%= defines the beginning of an expression, in which you can’t leave the body empty, but you could do something like this instead if the pure … Read more
A cookie is simply a short text string that is sent back and forth between the client and the server. You could store name=bob; password=asdfas in a cookie and send that back and forth to identify the client on the server side. You could think of this as carrying on an exchange with a bank … Read more