After adding in the mimetype in apache's configurations this started working as expected. However on Windows firefox clients 1.0.7 and 1.5 there wasn't an issue with acting on the wpad.dat file. Here's what I added to apache's mime type listings. application/x-ns-proxy-autoconfig dat I don't know whether this should be closed or not. Keep up the great work! -Joe Baker
I'd put this down to server misconfiguration.
I wasn't aware of this problem, it might need to be documented.... I'm going to reopen this, for now.
Bulk change to priority: https://bugzilla.mozilla.org/show_bug.cgi?id=1399258