Question

In my Grails app I’d like to make a custom request filter that looks for an existing ‘Location’ redirect header and modifies it if the response has not yet been committed.

I don’t see a method on the response object to even READ the existing headers, much less overwrite them.

Is there a way to do this?

Thanks!

Answer 1

This is done by creating a wrapper (extending HttpServletResponseWrapper) and overrideing the setHeader(..) method. There you can replace the header right before it is added to the response.

The wrapper is utilized by creating it in a filter:

 chain.doFilter(request, new ResponseWrapper(response))