json - IONIC 3 CORS ISSUE

Question

I am having a CORS issue with Ionic 3 when attempting to make GET calls to an API. I am using Ionic local server, running ionic serve in the command line for live server.

Error No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8100' is therefore not allowed access.

I tried updating ionic.config.json with proxy setting but that does not seem to be working..

{
  "name": "projectLeagueApp",
  "app_id": "47182aef",
  "type": "ionic-angular",
  "integrations": {
    "cordova": {}
  },
  "proxies": [
    {
      "path":"/games",
      "proxyUrl": "https://api-2445582011268.apicast.io/games/"
    }
  ]
}

My Data Service

import { Injectable } from '@angular/core';
import { Http, Headers, RequestOptions } from '@angular/http';
import 'rxjs/add/operator/map';


@Injectable()
export class DataProvider {

  headers = new Headers({'user-key': '1234567890123'});
  options = new RequestOptions ({headers: this.headers}); 
  limit: number = 50;

  constructor(public http: Http) {
    console.log('Hello DataProvider Provider');
  }

  getGames(genre, offset_num) {

    let genre_id = genre;
    let offset = offset_num;

    return this.http.get('https://api-2445582011268.apicast.io/games/?fields=name,release_dates,screenshots&limit='+this.limit+'&offset='+offset+'&order=release_dates.date:desc&filter[genres][eq]='+genre_id+'&filter[screenshots][exists]', this.options)
  }

}

I am trying to make calls to this api

Request Url

https://api-2445582011268.apicast.io
HEADERS
Key Value
user-key    YOUR_KEY
Accept  application/json

Primary Question My calls are failing. How do I create proxy for this issue?

Answer 1

To fix this issue, please change the following lines

ionic.config.json

{
  "name": "projectLeagueApp",
  "app_id": "47182aef",
  "type": "ionic-angular",
  "integrations": {
    "cordova": {}
  },
  "proxies": [
    {
      "path":"/games",
      "proxyUrl": "https://api-2445582011268.apicast.io/games"
    }
  ]
}

You have to remove the " / " which is at the end of of "proxyUrl".

My Data Service

return this.http.get('/games/?fields=name,release_dates,screenshots&limit='+this.limit+'&offset='+offset+'&order=release_dates.date:desc&filter[genres][eq]='+genre_id+'&filter[screenshots][exists]', this.options)

In the http call, the url should begin with '/games'. '/games' because ionic will proxy http://localhost:<port>/games to https://api-2445582011268.apicast.io/games

Please use the above method for external GET and POST calls in your application.

Thank you.