Is there any easy way to preprocess and redirect GET requests?

If you're homegrowing HTTP request authentication on top of JSF, then a servlet filter is really the best approach. JSF is "just" a MVC framework and nothing in the JSF API is been specified to filter incoming HTTP requests to check user authentication. On normal GET requests, a JSF managed bean is usually only constructed when the HTTP response is about to be created and sent, or maybe already is been committed.

This is not controllable from inside the managed bean. If the response is already been committed, you would not be able anymore to change (redirect) it. Authentication and changing the request/response really needs to be done far before the response is about to be sent.

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