Notification on DNS error?

[Chris Shearer Cooper]

I have observers on "http-on-modify-request", "http-on-examine-
response", and "http-on-examine-cached-response", and when my observer
gets called I add listeners on "load", "abort", and "error".

When I go to a page that doesn't exist (cnn.com/narglefloob.htm), I
get "http-on-modify-request" followed by "http-on-examine-response"
with the response status set to 404 and life is good.

However, if I go to a site that doesn't exist (www.narglefloog.com), I
get "http-on-modify-request" and that's all. I don't get any sort of
notification that DNS failed.

Is there another notification/observation I need to be hooking into?

Thanks,
Chris