แก้ config

Utils/MyHelper.cs

@@ -251,7 +251,8 @@ public class MyHelper
         string password = Configuration["JasperReportServer:password"];
 
         WebClient httpclient = new WebClient();
-        var result = httpclient.DownloadString($"{loginurl}?j_username={username}&j_password={password}");
+        string login_url = $"{loginurl}?j_username={username}&j_password={password}";
+        var result = httpclient.DownloadString(loginurl);
         string session = httpclient.ResponseHeaders.Get("Set-Cookie");
         httpclient.Headers.Add("Cookie", session);
         return httpclient;