API show 400 Bad Request

Question

hello guys 

is there any issue in this code , because i m getting 400 bad request error,

public async Task<ActionResult> Index()
      {
          List<ModelHome> EmpInfo = new List<ModelHome>();

          using (var client = new HttpClient())
          {
              //Passing service base url
              client.BaseAddress = new Uri(Baseurl);

              client.DefaultRequestHeaders.Clear();
              //Define request data format
              client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

              client.DefaultRequestHeaders.Add("Authorization", "Bearer " + token);
              client.DefaultRequestHeaders.Add("Access-Key", AccessKey);


              //Sending request to find web api REST service resource GetAllEmployees using HttpClient
              HttpResponseMessage Res = await client.GetAsync("api/Fee/GetDetail?challan_number=4780415&branchCode=24&organizationUserId=445");

              //Checking the response is successful or not which is sent using HttpClient
              if (Res.IsSuccessStatusCode)
              {
                  //Storing the response details recieved from web api
                  var EmpResponse = Res.Content.ReadAsStringAsync().Result;

                  //Deserializing the response recieved from web api and storing into the Employee list
                  EmpInfo = JsonConvert.DeserializeObject<List<ModelHome>>(EmpResponse);

              }
              //returning the employee list to view
              return View(EmpInfo);
          }
      }