Bug 53624

A call to sendRedirect after AsyncContext.dispatch doesn't redirect and returns with a 200 status code instead.

A project demonstrating the issue:
https://github.com/rstoyanchev/dispatch-test

Build and deploy the source in the 'tomcat-issue-repro'. From the home page of the deployed application, select the "Redirect" scenario. The scenario involves Servlet "RedirectA" that creates a thread and dispatches to Servlet "RedirectB", which in turn redirects to Servlet "RedirectC" and that forwards to a simple JSP page. Instead of the JSP page rendering, you should see a blank page and the log output will show that processing ended at ServletC.

For details on the setup see WebAppInitializer.setupRedirectScenario(ServletContext).

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FWIW if a forward is used instead of a dispatch from the async thread, the scenario works. To do that, modify the line that creates servlet "RedirectA" to be ForwardingAsyncServlet instead of DispatchingAsyncServlet.

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This issue is very similar to 51197, which was marked resolved in 7.0.25. The current issue was tested against 7.0.29.