/// <summary>return WebProxy to be used.</summary>
internal WebProxy Select()
{
Debug.Assert(_proxies.Count > 0);
Proxy proxy = GetProxyForConnection();
// If there is no responsive proxy (i.e. all proxies are down),
// set all to responsive irrespective of their last retry time
// and start from the first one again.
if (proxy == null)
{
SetAllResponsive();
proxy = GetProxyForConnection();
}
WebProxy webProxy = proxy.GetWebProxy();
//If it was previously determined that the proxy supports integrated authentication,
//set the appropriate property of the WebProxy object.
if (SupportsIntegratedAuthentication(webProxy))
webProxy.Credentials = CredentialCache.DefaultCredentials;
// Get credentials from cache and set it in WebProxy that we are going to return.
// In case connection is direct (without proxy), there can not be any proxy credentials
else if (webProxy.Address != null)
webProxy.Credentials = CredentialsCache.GetInstance().GetCredentials(webProxy.Address);
return webProxy;
}
/// <summary>Set the credentials in the Cache.</summary>
/// <param name="webProxy"></param>
/// <param name="networkCredentials"></param>
internal void SetCredentials(WebProxy webProxy, NetworkCredential networkCredentials)
{
CredentialsCache.GetInstance().SetCredentials(webProxy.Address, networkCredentials);
}