在预检响应中，Access-Control-Allow-Header不允许使用标题字段Access-Control-Allow-Origin

Question

Angular 2：

import { Injectable, Component, OnInit } from '@angular/core';
import { FormGroup, FormsModule, FormControl, Validators } from '@angular/forms'
import { Http, Response, Headers, HttpModule, RequestOptions, URLSearchParams } from '@angular/http'; 
import { Observable } from 'rxjs/Rx';
import 'rxjs/add/operator/map';

@Component({
    selector: 'message-notofication',
    templateUrl: './messageNotification.html',
    styleUrls: ['./messageNotification.css']
})

@Injectable() 
export class emailNotification {
    constructor(private http:Http) { }
    userForm = new FormGroup ({
        msg_name: new FormControl(),
        msg_details: new FormControl()
    });
    onFrmSubmit(){
        let urlUpto = 'http://ncfkdevweb01/POSAlertWebService/api/';
        let data = {
            "NotificationID": "0",
            "SubmitedEmail": "vasanth@gmail.com",
            "PublishEmail": "vasanth1@gmail.com",
            "ErrorEmail": "Telecom",
            "Module": "1"
        }
        const headers = new Headers();
        let body = JSON.stringify(data);
        headers.append('Access-Control-Allow-Origin', '*');
        headers.append('Access-Control-Allow-Credentials', 'true');
        headers.append("Access-Control-Allow-Methods", "GET,HEAD,OPTIONS,POST,PUT");
        let options = new RequestOptions({headers: headers});  
          return this.http.put( urlUpto + "POSAlertEmailNotificiation/UpdateInsertNotificationEmail", body, options)
          .subscribe(()=>{},
              err =>console.log(err)
          );
    } 
}

以上代码用于PUT service call中的angular 2。从服务器端，我们允许CORS文件中的web.config。

但我仍然无法修复此issue，例如显示“标头字段在预检响应中的Access-Control-Allow-Header不允许访问控制允许 - 来源