[Débutant] Construction d'une requete http d'un WebUi

Bonjour,

je cherche à me connecter un webui en local et je n'y arrive pas ça coince.
Il faut que je balance la requete http://localhost:8080/login pour en paramètre username=admin&password=adminadmin.
Mais j'ai l'erreur : le serveur distant retourne une erreur. Merci de votre aide

dans Fiddler, voila ce que je devrais obtenir:

POST http://localhost:8080/login HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Content-Length: 34
Accept: text/javascript, text/html, application/xml, text/xml, */*
Origin: http://localhost:8080
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36
Content-type: application/x-www-form-urlencoded; charset=UTF-8
Referer: http://localhost:8080/
Accept-Encoding: gzip, deflate, br
Accept-Language: fr-FR,fr;q=0.8,en-US;q=0.6,en;q=0.4

username=admin&password=adminadmin

Code:

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                    public static void HttpPostRequest(string url, Dictionary<string, string> postParameters)
        {
            string postData = "";
 
            foreach (string key in postParameters.Keys)
            {
                if (postData != "")
                    postData += "&";
 
                postData += HttpUtility.UrlEncode(key) + "="
                      + HttpUtility.UrlEncode(postParameters[key]);
            }
 
            HttpWebRequest myHttpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
            myHttpWebRequest.Method = "POST";
            myHttpWebRequest.KeepAlive = true;
            myHttpWebRequest.PreAuthenticate = true;
            myHttpWebRequest.ProtocolVersion = HttpVersion.Version11;
            myHttpWebRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)";
            myHttpWebRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8";
            myHttpWebRequest.AutomaticDecompression = DecompressionMethods.GZip;
 
 
 
 
 
            byte[] data = Encoding.UTF8.GetBytes(postData);
            myHttpWebRequest.ContentType = "application/x-www-form-urlencoded";
            myHttpWebRequest.ContentLength = data.Length;
 
           Stream requestStream = myHttpWebRequest.GetRequestStream();
            Console.WriteLine("\nThe HTTP request Headers for the first request are: \n{0}", myHttpWebRequest.Headers);
            requestStream.Write(data, 0, data.Length);
            requestStream.Close();
 
            HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
            foreach (Cookie a in myHttpWebResponse.Cookies)
            {
                Console.WriteLine("{0} {1}", a.Name, a.Value);
            }
 
 
            myHttpWebResponse.Close();
 
        };

Code:

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             Dictionary<string, string> parameters = new Dictionary<string, string>();
 
             parameters.Add("username", "admin");
             parameters.Add("password", "adminadmin");
             HttpPostRequest("http://localhost:8080/login", parameters);