无法从Ionic 3调用Wcf Post方法

Question

我从Ionic请求wcf post方法，但出现错误{"headers":{"normalizedNames":{},"lazyUpdate":null,"headers":{}},"status":0,"statusText":"Unknown Error","url":null,"ok":false,"name":"HttpErrorResponse","message":"Http failure response for (unknown url): 0 Unknown Error","error":{"isTrusted":true}}我的WCF Post方法是  public Stream GetMonthWiseAttendance(InputMonthwise input)        {            var SerializeObject = new JavaScriptSerializer();                var temp = context.MobAttendMonthWiseStudentAttaindance(input.StudentMainId, input.InstituteId, input.Yearid).ToList();            string jsonClient = SerializeObject.Serialize(temp);            WebOperationContext.Current.OutgoingResponse.ContentType =                "application/json; charset=utf-8";            WebOperationContext.Current.OutgoingResponse.Headers.Add("Access-Control-Allow-Origin", "*");            WebOperationContext.Current.OutgoingResponse.Headers.Add("Access-Control-Allow-Headers", "Cache-Control, Pragma, Origin, Authorization, Content-Type, X-Requested-With,Accept");            WebOperationContext.Current.OutgoingResponse.Headers.Add("Access-Control-Allow-Methods", "GET, PUT, POST");            WebOperationContext.Current.OutgoingResponse.Headers.Add("Access-Control-Max-Age", "1728000");            return new MemoryStream(Encoding.UTF8.GetBytes(jsonClient));       }我的离子码是callPost()   {     let headers = new HttpHeaders();    headers.append('Content-Type', 'application/json');    headers.append('Access-Control-Allow-Origin' , '*');    headers.append('Access-Control-Allow-Methods', 'POST, GET, OPTIONS, PUT');   let data=JSON.stringify({userName:'Rameshwar',InstituteId:1191,Yearid:135,StudentMainId:135 });有了这个离子代码，我能够调用php的post方法，但是调用wcf方法却出错了。我也可以使用相同的标头调用Wcf的Get方法以进行响应我还与Postman Rest客户端一起检查了该wcf发布请求。我从其他客户/邮递员那里得到了很好的回应。

Answer 1

我认为问题出在Ionic Code中，无需整理发布数据，由ionic在内部进行管理。

let data=JSON.stringify({userName:'Rameshwar',InstituteId:1191,Yearid:135,StudentMainId:135 });

改成，

let data={userName:'Rameshwar',InstituteId:1191,Yearid:135,StudentMainId:135 };