Only needs content.
Check for Redirect

The status may be below 400 and still we could rewrite it. There is a
redirect when a file is not found so simply checking for non 404 does
not work correctly.
Prevent Default or erros will occur.
PDF Files still have to go through renaming

Otherwise we would have two totally different approaches for File
naming. Basically we now have PDF-files with the name reflecting the
title and dashes.