Steps to reproduce)

(You can use proxy server with authentication instead Step 1 to 3, we can recreate with Squid.)

1) Download Fiddler 4
http://www.telerik.com/download/fiddler

2) Run Fiddler
(It will overwrite proxy settings on the system)

3) Select "Menu -> Rules -> Require Proxy Authentication" on Fiddler.
(It will provide authentication as user=1 pass=1)

4) Run attached sample, The app will load https://www.google.com/maps

5) Input 1, 1 to the dialog.

Result)

Expected: The page will load.
Actual: The page is never loaded. (google-map-with-auth.PNG)

Additional Info)

• Sometimes it works or sometimes it doesn't work, please try again and again.
• Internet Explorer can load on same environment.
• The sample work if unselect "Menu -> Rules -> Require Proxy Authentication".