internal static IEnumerable <Uri> getProxiesForUrl(
Uri requestUrl, string userAgent)
{
IntPtr hHttpSession = IntPtr.Zero;
string[] proxyList = null;
;
try {
hHttpSession = WinHttpOpen(userAgent,
AccessType.NoProxy, null, null, 0);
if (hHttpSession != IntPtr.Zero)
{
AutoProxyOptions autoProxyOptions = new AutoProxyOptions();
autoProxyOptions.Flags = AccessType.AutoDetect;
autoProxyOptions.AutoLogonIfChallenged = true;
autoProxyOptions.AutoDetectFlags =
AutoDetectType.Dhcp | AutoDetectType.DnsA;
ProxyInfo proxyInfo = new ProxyInfo();
if (WinHttpGetProxyForUrl(hHttpSession,
requestUrl.ToString(), ref autoProxyOptions, ref proxyInfo))
{
if (!string.IsNullOrEmpty(proxyInfo.Proxy))
{
proxyList = proxyInfo.Proxy.Split(';', ' ');
}
}
}
}
catch (System.DllNotFoundException) {
// winhttp.dll is not found.
}
catch (System.EntryPointNotFoundException) {
// A method within winhttp.dll is not found.
}
finally {
if (hHttpSession != IntPtr.Zero)
{
WinHttpCloseHandle(hHttpSession);
hHttpSession = IntPtr.Zero;
}
}
if (proxyList != null && proxyList.Length > 0)
{
Uri proxyUrl;
foreach (string address in proxyList)
{
if (tryCreateUrlFromPartialAddress(address, out proxyUrl))
{
yield return(proxyUrl);
}
}
}
}
internal static IEnumerable<Uri> GetProxiesForUrl(
Uri requestUrl, string userAgent)
{
IntPtr hHttpSession = IntPtr.Zero;
string[] proxyList = null;
;
try {
hHttpSession = WinHttpOpen(userAgent,
AccessType.NoProxy, null, null, 0);
if (hHttpSession != IntPtr.Zero) {
AutoProxyOptions autoProxyOptions = new AutoProxyOptions();
autoProxyOptions.Flags = AccessType.AutoDetect;
autoProxyOptions.AutoLogonIfChallenged = true;
autoProxyOptions.AutoDetectFlags =
AutoDetectType.Dhcp | AutoDetectType.DnsA;
ProxyInfo proxyInfo = new ProxyInfo();
if (WinHttpGetProxyForUrl(hHttpSession,
requestUrl.ToString(), ref autoProxyOptions, ref proxyInfo)) {
if (!string.IsNullOrEmpty(proxyInfo.Proxy)) {
proxyList = proxyInfo.Proxy.Split(';', ' ');
}
}
}
}
catch (System.DllNotFoundException) {
// winhttp.dll is not found.
}
catch (System.EntryPointNotFoundException) {
// A method within winhttp.dll is not found.
}
finally {
if (hHttpSession != IntPtr.Zero) {
WinHttpCloseHandle(hHttpSession);
hHttpSession = IntPtr.Zero;
}
}
if (proxyList != null && proxyList.Length > 0) {
Uri proxyUrl;
foreach (string address in proxyList) {
if (TryCreateUrlFromPartialAddress(address, out proxyUrl)) {
yield return proxyUrl;
}
}
}
}
private static extern bool WinHttpGetProxyForUrl(
IntPtr hSession,
string url,
[In] ref AutoProxyOptions autoProxyOptions,
[In, Out] ref ProxyInfo proxyInfo);
