Apache HttpClient 4.2.5: Target server digest authentication fails with Proxy Basic auth

We are trying to do HTTPGet on a target server enabled with Digest authentication. It works perfectly fine, however when proxy with basic authentication is introduced target authentication is failing. It fails with HTTP response 401 from target server. We are using IBM JDK, HTTP Client 4.2.5. Has anybody faced similar issues and knows a fix to it?

Code:

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HttpHost proxy = new HttpHost(proxyHost, 808);
    HttpHost target = new HttpHost(targetHost, 80);
    HttpGet req = new HttpGet("/default.asp");
    Credentials targetCredentials = new UsernamePasswordCredentials(targetUser, targetpassword);
    Credentials proxyCredentials = new UsernamePasswordCredentials(proxyUser, proxyPassword);
 
    DefaultHttpClient httpclient = null;
    try {
        final PoolingClientConnectionManager connectionManager = new PoolingClientConnectionManager();
        httpclient = new DefaultHttpClient(connectionManager);
        HttpContext localContext = new BasicHttpContext();
        req.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);
        System.out.println("executing request to " + target + " via " + proxy);
        httpclient.getCredentialsProvider().setCredentials(new AuthScope(proxy), proxyCredentials);
        httpclient.getCredentialsProvider().setCredentials(new AuthScope(target), targetCredentials);
        HttpResponse rsp = httpclient.execute(target, req,localContext);
        AuthState proxyAuthState = (AuthState) localContext.getAttribute(ClientContext.PROXY_AUTH_STATE);
        System.out.println("Proxy auth state: " + proxyAuthState.getState());
        System.out.println("Proxy auth scheme: " + proxyAuthState.getAuthScheme());
        System.out.println("Proxy auth credentials: " + proxyAuthState.getCredentials());
        AuthState targetAuthState = (AuthState) localContext.getAttribute(ClientContext.TARGET_AUTH_STATE);
        System.out.println("Target auth state: " + targetAuthState.getState());
        System.out.println("Target auth scheme: " + targetAuthState.getAuthScheme());
        System.out.println("Target auth credentials: " + targetAuthState.getCredentials());
 
        HttpEntity entity = rsp.getEntity();
 
        if (entity != null) {
            System.out.println(EntityUtils.toString(entity));
        }
 
    }catch (Exception e) {
    } finally {
        httpclient.getConnectionManager().shutdown();
    }
 
}