Certain malware such as AVG hijack 404 pages in order to display a page in the browser riddled with their own ads. The only work around I've found is to abandon 404 http status codes for custom error pages in my webapp.
Is there any other work around?
Edit:
Anybody know of any other toolbars/programs that also hijack 404 pages without checking whether they are generic error pages or not?
Is there a way to detect the presence of AVG from the query string or otherwise? (I assume not)
I've created a petition to AVG on this.