search for: really_do_the_download

I am looking for an example of how to download an xml file to a user''s machine. I have created a web page that allows the user to enter a file_name and validates the field - using errors.add - but after a valid file_name has been entered while the file does download properly, the web page is never updated and it looks like there is still an error. How do I send_data and redirect_to