Internet Explorer has always had a braindead 404 error handling. I found out that if the page sent on a 404 is over 512 bytes MSIE will not show its own error page. Speaking of which, there's quite a few spoofs of that page going around, http://www.ipfw.org/ (it should be something else) says the page sucks, http://hmm.dk/ [Danish] simply isn't edible, and http://www.def-con.org/404.html just can't display weapons of mass destruction.
Author M. G. Liebach
LastMod 2016-05-01 (9fc4632)