Comment #7 on issue 5688 by [email protected]: Too many resource requests  
by renderer can cause memory exhaustion and eventual browser crash.
http://code.google.com/p/chromium/issues/detail?id=5688

> Eric, my suspicion is that cancellation of PAC requests is not noticed  
until after
> the WinHttpGetProxyForURL call completes.  So, if we have millions of PAC  
requests
to
> cancel, we'll still end up doing millions of expensive calls to
> WinHttpGetProxyForURL.

The root problem to fix here is the renderer shouldn't be allowed to  
initiate an
unbounded number of requests in the first place.



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