[Bug 32438] winhttp:winhttp conformance test WinHttpGetProxyForUrl() failure

http://bugs.winehq.org/show_bug.cgi?id=32438

--- Comment #2 from François Gouget  2012-12-13 19:42:52 CST ---
I have tweaked my setup so I now have a local wpad DNS entry which is an alias
(CNAME) for another hostname. This lets me snoop the traffic to that host from
the Windows hosts.

* On Windows XP WinHttpDetectAutoProxyConfigUrl() does use the IP address in
the URL it returns. But on Windows 8 it clearly converted the IP address back
to a hostname because it's using the wrong CNAME.

* With my setup trying to download the wpad.dat file always results in a 404
error instead of failing with a 500 error only if the wrong hostname is used.

* This results in WinHttpGetProxyForUrl() returning
ERROR_WINHTTP_UNABLE_TO_DOWNLOAD_SCRIPT on both Windows XP and Windows 8. In
Wine I still get ERROR_WINHTTP_BAD_AUTO_PROXY_SCRIPT instead.
-> Wine should check for errors when trying to download the configuration
script.

* On Windows XP and Windows 8, WinHttpGetProxyForUrl() results in two download
attempts: one with the HTTP Host field set to the IP address, and one with it
set to 'wpad' (no domain name), both made with the 'Wine Regression Test' user
agent.