What is the best way to bring down a web application for a quick modification in WebSphere AS?

While making some small changes to a Web application which is deployed in a WebSphere AS, we want to b开发者_开发百科ring the application down with a static Under Construction page. What is the best way to achieve this given that it should not be required to restart the AS. Something similar to an ASP.Net App_Offline.htm like solution.

Thanks in advance

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Install Apache HTTPD as proxy server in front of WAS with help of mod_jk (ignore the Tomcat part, it'll work just fine, WAS uses a fork of Tomcat onder the covers) and provide that static Under Construction page as 404/503 error page in Apache HTTPD configuration.