/// <summary>Creates a tunnel to the target server.</summary>
/// <remarks>
/// Creates a tunnel to the target server.
/// The connection must be established to the (last) proxy.
/// A CONNECT request for tunnelling through the proxy will
/// be created and sent, the response received and checked.
/// This method does <i>not</i> update the connection with
/// information about the tunnel, that is left to the caller.
/// </remarks>
/// <exception cref="Apache.Http.HttpException"></exception>
/// <exception cref="System.IO.IOException"></exception>
private bool CreateTunnelToTarget(AuthState proxyAuthState, HttpClientConnection
managedConn, HttpRoute route, IHttpRequest request, HttpClientContext context)
{
RequestConfig config = context.GetRequestConfig();
int timeout = config.GetConnectTimeout();
HttpHost target = route.GetTargetHost();
HttpHost proxy = route.GetProxyHost();
HttpResponse response;
string authority = target.ToHostString();
IHttpRequest connect = new BasicHttpRequest("CONNECT", authority, request.GetProtocolVersion
());
this.requestExecutor.PreProcess(connect, this.proxyHttpProcessor, context);
for (; ;)
{
if (!managedConn.IsOpen())
{
this.connManager.Connect(managedConn, route, timeout > 0 ? timeout : 0, context);
}
connect.RemoveHeaders(AUTH.ProxyAuthResp);
this.authenticator.GenerateAuthResponse(connect, proxyAuthState, context);
response = this.requestExecutor.Execute(connect, managedConn, context);
int status = response.GetStatusLine().GetStatusCode();
if (status < 200)
{
throw new HttpException("Unexpected response to CONNECT request: " + response.GetStatusLine
());
}
if (config.IsAuthenticationEnabled())
{
if (this.authenticator.IsAuthenticationRequested(proxy, response, this.proxyAuthStrategy
, proxyAuthState, context))
{
if (this.authenticator.HandleAuthChallenge(proxy, response, this.proxyAuthStrategy
, proxyAuthState, context))
{
// Retry request
if (this.reuseStrategy.KeepAlive(response, context))
{
this.log.Debug("Connection kept alive");
// Consume response content
HttpEntity entity = response.GetEntity();
EntityUtils.Consume(entity);
}
else
{
managedConn.Close();
}
}
else
{
break;
}
}
else
{
break;
}
}
}
int status_1 = response.GetStatusLine().GetStatusCode();
if (status_1 > 299)
{
// Buffer response content
HttpEntity entity = response.GetEntity();
if (entity != null)
{
response.SetEntity(new BufferedHttpEntity(entity));
}
managedConn.Close();
throw new TunnelRefusedException("CONNECT refused by proxy: " + response.GetStatusLine
(), response);
}
// How to decide on security of the tunnelled connection?
// The socket factory knows only about the segment to the proxy.
// Even if that is secure, the hop to the target may be insecure.
// Leave it to derived classes, consider insecure by default here.
return(false);
}
public override bool IsClosed()
{
HttpClientConnection conn = GetConnection();
return(!conn.IsOpen());
}
