Fixed proxy issue when using WPAD on Windows 8.1+ #722
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If IE was set to use Web-Proxy Auto-Dicovery (WPAD) on Windows 8.1 or newer, a request would fail with "Settings proxy options: 12011: The option value cannot be set" when trying to set the proxy for the request.
The new WINHTTP_ACCESS_TYPE_AUTOMATIC_PROXY doesn't allow manually specifying the proxy by using WinHttpSetOption.
Please note that the error is only triggered if the executable has a manifest specifying support for Windows 8.1+. Otherwise the calling process will run in Windows Vista compatibility mode, and not trigger the error.