Classe HttpClient & Proxy

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public class CookieWebClient : WebClient
{
    public CookieContainer CookieContainer { get; private set; }
 
    /// <summary>
    /// This will instanciate an internal CookieContainer.
    /// </summary>
    public CookieWebClient()
    {
        this.CookieContainer = new CookieContainer();
    }
 
    /// <summary>
    /// Use this if you want to control the CookieContainer outside this class.
    /// </summary>
    public CookieWebClient(CookieContainer cookieContainer)
    {
        this.CookieContainer = cookieContainer;
    }
 
    protected override WebRequest GetWebRequest(Uri address)
    {
        var request = base.GetWebRequest(address) as HttpWebRequest;
        if (request == null) return base.GetWebRequest(address);
        request.CookieContainer = CookieContainer;
        return request;
    }
}

var handler = new HttpClientHandler
{
  Proxy = new WebProxy("http://localhost:8888", false),
  UseProxy = true
};

var client = new HttpClient(handler) {
  BaseAddress = "http://.........",
};

<system.net>
    <defaultProxy enabled="true" useDefaultCredentials="true">
        <proxy usesystemdefault="True" />
    </defaultProxy>
</system.net>