The remote server returned an error: (400) bad request. I am getting this error while login to face book

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While I am trying to integrate Facebook login to my application.I am facing a bad request error. I used this link Get user Facebook details in ASP.NET and C#[^] as reference

What I have tried:

string respnse = "";
       if (Request.QueryString["code"] != null)
       {

           string code = Request.QueryString["code"].ToString();

           oAuthFacebooks fbAC = new oAuthFacebooks(); //Standard FB class file available on net in c#

           try
           {
               fbAC.AccessTokenGet(code);
               respnse = fbAC.Token;
           }
           catch (Exception ex)
           {
               Response.Redirect("http://localhost:8020/App/Login.aspx?error=" + ex.Message);
           }





       }
       else
       {
           Response.Redirect("http://localhost:8020/aspx/SiteLogin.aspxerror=code not found" +
                             Request.QueryString["error_reason"].ToString());
       }

       string token = respnse;
       string HitURL = string.Format("https://graph.facebook.com/me?access_token={0}", token);
       oAuthFacebooks objFbCall = new oAuthFacebooks();
       string JSONInfo = objFbCall.WebRequest(oAuthFacebooks.Method.GET, HitURL, "");

Posted 23-Nov-20 3:13am

musaveer

Updated 23-Nov-20 5:49am

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Sandeep Mewara · Answer 1 · 2020-11-23T05:49:00

Believe that reference is outdated.

Refer this: .net: ASP.Net Web forms: Implementing google and facebook login[^]

Make GET request for token and then use it to go to Facebook.

C#

if (Request["code"] != null)
{
    string url = string.Format(ConfigurationManager.AppSettings["FacebookOAuthurl"],
        ConfigurationManager.AppSettings["Facebook_AppId"],
        ConfigurationManager.AppSettings["Facebook_RedirectUrl"],
        ConfigurationManager.AppSettings["Facebook_scope"],
        Request["code"].ToString(),
        ConfigurationManager.AppSettings["Facebook_AppSecret"]);

    string tokenResponse = MakeWebRequest(url, "GET");
    var tokenInfo = new JavaScriptSerializer().Deserialize<FacebookToken>(tokenResponse);
    var facebookInfoJson = MakeWebRequest(ConfigurationManager.AppSettings["FacebookAccessUrl"] + tokenInfo.access_token,

"GET");
    FacebookInfo objUser = new JavaScriptSerializer().Deserialize<FacebookInfo>(facebookInfoJson);
    txtResponse.Text = facebookInfoJson;
}


public string MakeWebRequest(string destinationUrl, string methodName, string contentType = "", string requestJSON = "")
{
    try
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(destinationUrl);
        request.Method = methodName;
        if (methodName == "POST")
        {
            byte[] bytes = System.Text.Encoding.ASCII.GetBytes(requestJSON);
            request.ContentType = contentType;
            request.ContentLength = bytes.Length;
            using (Stream requestStream = request.GetRequestStream())
            {
                requestStream.Write(bytes, 0, bytes.Length);
            }
        }
        using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
        {
            if (response.StatusCode == HttpStatusCode.OK)
            {
                using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                {
                    return reader.ReadToEnd();
                }
            }
        }

        return null;
    }
    catch (WebException webEx)
    {
        return webEx.Message;
    }
}