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    Bug 
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    Resolution: Done
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    P1: Critical 
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    5.8.0 Beta, 5.8.0
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    MacOS 10.12
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        20f7cfcbdab795b1730e3d1d14fc3833a7f5e705
Regression: When I send a XMLHttpRequest, the application crashes:
I can provide the exact parameters set on the request if it doesn't crash for you. It works with 5.7, only crashes in 5.8.
How to reproduce:
Download the attached pac file, go to the directory where the file exists and run `python -m SimpleHTTPServer 8009` then go to System Preferences -> Network -> your connection -> Advanced -> Proxies and enable "Automatic Proxy Configuration" and set its url to "http://127.0.0.1:8009/proxy.pac" the code bundled in untitled.zip should crash.
- is duplicated by
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                    QTBUG-58962 QNetworkProxyFactory::systemProxyForQuery crash on Mac during PAC detection -           
- Closed
 
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                    QTBUG-60184 QNetworkAccessManager crashes on Mac OS -           
- Closed
 
-         
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                    QTBUG-58466 [Reg 5.7->5.8] Crash when using network proxy -         
- Closed
 
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- replaces
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                    QTCREATORBUG-17699 QtCreator crash on macOS -           
- Closed
 
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