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All web applications display dynamic information that is fetched from the computer resources that support the web application (in contrast to web sites, which may only display static content). In many cases a web application is supported by a web server like <a href="http://tomcat.apache.org/" target="_blank">Tomcat</a> or by “serverless” components like Amazon Web Services (AWS) Lambda. To simplify the discussion in this article, the back end system will be referred to as a web server.