iOS 501 not implemented error


#1
let apiUrl = 'api/feed/';
var headers = new Headers();
      headers.append('auth', localStorage.getItem('token'))
      this.http.get(apiUrl+nPage, {headers: headers})
	    .timeout(20000)  
        .map(res => res.json())
        .subscribe(
          data => {
            setTimeout(() => {
              this.postlists = data;     
              this.countElement += data.length;
  			  this.post_error = "0";          
              loadingPopup.dismiss();         
            }, 1000);
          },
          err => {
			loadingPopup.dismiss();           
			this.post_error = "1";            
		  }
      );

ionic.config.json

{
  "name": "nefeedApp",
  "app_id": "",
  "proxies": [
    {
      "path": "/api",
      "proxyUrl": "http://77.244.215.206:12345/"
    }
  ],
  "type": "ionic-angular",
  "integrations": {
    "cordova": {}
  }
}

It works with ionic serve -l, but in device I have 501 error