ionic 2没有'Access-Control-Allow-Origin'标题

Question

我想在restfull api上发布数据但是我接受（XMLHttpRequest无法加载https://deneme.com/api/v1.0/users/login/。对预检请求的响应没有通过访问控制检查：请求的资源上没有'Access-Control-Allow-Origin'标头。来源'http://localhost:8100 '因此不允许访问。）错误。

我用chrome插件（Allow-Control-Allow-Origin：*）解决了这个问题。但我的代码不适用于Android设备。怎么能用代码解决这个问题

我的代码;

kanallistele()
{

  var veri;

     this.kanallardiv=true;
    this.uyegirisdiv=false;
    this.kanallistelebtn = false;
    var headers = new Headers();
    headers.append('Accept', 'application/json');
    headers.append('Content-Type', 'application/json' );
    headers.append('Access-Control-Allow-Origin','*'); 
    //headers.append('Authorization' , 'Basic '+ btoa(tok));
    let options = new RequestOptions({ headers: headers });

    let postParams = {
    token: "381f13d7056-ce5fe474919",
    user_id: "71",
    }

    var veris="channel_name_";
    this.http.post("https://deneme.com/api/v1.0/channels/", postParams, options)
      .subscribe(data => {
        veri = data['_body'];
        console.log(veri);       
        veri= veri.slice(1, -1);
        veri = veri.replace(/\\/g, "");
        veri = JSON.parse(veri);
        for(var i = 0 ;;i++)
          {
              if(!veri.channel_list['channel_name_' + (i)])
                    break;   

              this.veriler.push({channelname: veri.channel_list['channel_name_' + (i)],channelid: veri.channel_list['channel_id_' + (i)]});              
          }
       }, error => {
        console.log(error);// Error getting the data
      });  
  }

Answer 1

像这样使用Header参数：

let headers = new Headers();
headers.append('Content-Type', 'application/json');
this.headers = {headers};
this.http.post(API_URL, JSON.stringify(userData), this.headers).map(res => 
res.json());

希望它有效。

Answer 2

尝试在文件顶部的Rest Api文件中添加Allow-Control-Allow-Origin