When an error occurs during handling a request, I redirect to a special controller for error messages. For XML HTTP request I noticed that Firefox (1.0.7) does not set the X-Requested-With header to XMLHttpRequest on the second, redirected request. Konqueror (3.5.2), the only other browser I've checked, does add the header as expected.
I'm working around this by adding an additional param to the redirect_to that indicates that it is meant to be handled as an XHR even though request.xhr? is not true.
Now I'm wondering whether there's anything wrong with redirecting XHRs or if it's just a bug in that version of Firefox.
Michael
