Redirect loop for /_ah/ subdomain

[Former user]

I tried running it by uploading contents of war file as described in help, but couldn't login as it was getting in redirect loop.

Here is what you need to web.xml to resolve it.

        <security-constraint> 
        <web-resource-collection>       
            <url-pattern>/_ah/*</url-pattern> 
        </web-resource-collection> 

     </security-constraint> 

[Christian Goudreau]

Is that locally? "/_ah/" is already reserved for the internal tool at google

when uploading a module to appengine you should access it with : http://gaestudio.your_app_id.appspot.com/

[Christian Goudreau]

You can see demo: http://gaestudio.gaestudio-demo.appspot.com/#visualizer