public static extern bool WinHttpGetIEProxyConfigForCurrentUser(
out WINHTTP_CURRENT_USER_IE_PROXY_CONFIG proxyConfig);
public static extern bool WinHttpGetIEProxyConfigForCurrentUser(
out WINHTTP_CURRENT_USER_IE_PROXY_CONFIG proxyConfig);
public Task <WebProxy> CreateProxyAsync(Uri destination)
{
var ieProxy = new WINHTTP_CURRENT_USER_IE_PROXY_CONFIG();
var success = WinHttpGetIEProxyConfigForCurrentUser(out ieProxy);
if (success && ieProxy.Proxy != IntPtr.Zero)
{
var proxyUrl = Marshal.PtrToStringUni(ieProxy.Proxy);
var bypassList = Marshal.PtrToStringUni(ieProxy.ProxyBypass)?.Split(';', ' ', '\t', '\r', '\n');
return(Task.FromResult(new WebProxy(new Uri($"http://{proxyUrl}"), bypassList?.Contains("<local>") ?? false, bypassList)));
}
var session = WinHttpOpen(null, WINHTTP_ACCESS_TYPE_AUTOMATIC_PROXY, WINHTTP_NO_PROXY_NAME,
WINHTTP_NO_PROXY_BYPASS, 0);
if (session.IsInvalid)
{
WriteLog.To.Sync.W(Tag,
$"Unable to open WinHttp session to query for proxy (error code: {Marshal.GetLastWin32Error()})");
return(Task.FromResult <WebProxy>(null));
}
var options = new WINHTTP_AUTOPROXY_OPTIONS
{
AutoConfigUrl = null,
AutoDetectFlags = WINHTTP_AUTO_DETECT_TYPE_DHCP | WINHTTP_AUTO_DETECT_TYPE_DNS_A,
AutoLoginIfChallenged = false,
Flags = WINHTTP_AUTOPROXY_AUTO_DETECT,
Reserved1 = IntPtr.Zero,
Reserved2 = 0
};
var info = new WINHTTP_PROXY_INFO
{
AccessType = 0,
Proxy = IntPtr.Zero,
ProxyBypass = IntPtr.Zero
};
success = WinHttpGetProxyForUrl(session, destination.AbsoluteUri, ref options, out info);
session.Close();
if (!success)
{
var lastErr = Marshal.GetLastWin32Error();
if (lastErr != ERROR_WINHTTP_AUTODETECTION_FAILED)
{
WriteLog.To.Sync.W(Tag,
$"Call to WinHttpGetProxyForUrl failed (error code: {lastErr})");
}
else
{
WriteLog.To.Sync.W(Tag, "Call to WinHttpGetProxyForUrl failed (possible direct connection)...");
}
return(Task.FromResult <WebProxy>(null));
}
var url = Marshal.PtrToStringUni(info.Proxy);
var bypass = Marshal.PtrToStringUni(info.ProxyBypass)?.Split(';', ' ', '\t', '\r', '\n');
return(Task.FromResult(new WebProxy(new Uri($"http://{url}"), bypass?.Contains("<local>") ?? false, bypass)));
}
