[Development] QtNetwork: using system proxy by default

[shane.kearns at accenture.com]

> IMHO #4 gives the best out-of-the-box experience.
>
> Is there a way to do the blocking winapi call in a thread on app start-
> up maybe?

Doesn't help if the first thing an application wants to do is download something from the network.
It would only help because of the workaround we already have to disable WPAD if it fails (which is not ideal if you start an app at home, then take your laptop to work)

> How do other apps (i.e. Chrome) handle this without blocking the user
> experience?

Chrome doesn't use the windows API, they make a request to "http://wpad" and interpret the pac script themselves.
Firefox is slow to load pages, but UI is not blocked (which points to using the windows API in a thread)

WPAD is inherently spoofable, but the Chrome method is worse than the windows API, as you can't tell if the name came from DNS or multicast name resolution.
In any case, we don't have a javascript interpreter available at the QtNetwork level.

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