No 'Access-Control-Allow-Origin' header in Angular 2 app

user_4803039 0
Viewed 302160

For this project, I'm just learning and practicing Angular 2. I have no server-side and am making API requests to barchart ondemand api .

I'm wondering if it is possible to bypass the cors issue. I'm still fairly new to all this, so baby-step instructions are really appreciated! I'm using http://localhost:8080.

Error message: (api key commented out)

XMLHttpRequest cannot load http://marketdata.websol.barchart.com/getHistory.json?key=MY_API_KEY&symbol=GOOG&type=daily&startDate=20150311000000. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8080' is therefore not allowed access.

StockInformationService:

import {Injectable} from 'angular2/core';
import {Http, Headers} from 'angular2/http';
import {Observable} from 'rxjs/Rx';

@Injectable()
export class StockInformationService {
    private apiRoot = "http://marketdata.websol.barchart.com/getHistory.json?key=MY_API_KEY&";

    constructor (private _http: Http) {}

    getData(symbol: string): Observable<any> {
        // Tried adding headers with no luck
        const headers = new Headers();
        headers.append('Access-Control-Allow-Headers', 'Content-Type');
        headers.append('Access-Control-Allow-Methods', 'GET');
        headers.append('Access-Control-Allow-Origin', '*');

        return this._http.get(this.apiRoot + "symbol=" + symbol + "&type=daily&startDate=20150311000000", {headers: headers})
            .map(response => response.json());
    }
}

App Component:

import {Component} from "angular2/core";
import {VolumeComponent} from '../../components/volume/volume';
import {StockInformationService} from '../../core/stock-information.service';

@Component({
    selector: 'app-shell',
    template: require('./app-shell.html'),
    directives: [VolumeComponent],
    providers: [StockInformationService]
})
export class AppShell {
    constructor(private _stockInformationService: StockInformationService) {}

    // In my template, on button click, make api request
    requestData(symbol: string) {
        this._stockInformationService.getData(symbol)
            .subscribe(
                data => {
                    console.log(data)
                },
                error => console.log("Error: " + error)
            )}
    }

}

In my console, the requestData Error: Error: [object Object]

angular webpack cors header
13 Answers

Simply you can set in php file as

header("Access-Control-Allow-Origin: *");
header("Content-Type: application/json; charset=UTF-8");
user_83381280

I got the same error and here how I solved it, by adding the following to your spring controller:

@CrossOrigin(origins = {"http://localhost:3000"})
user_29563290

this is server configuration, set up config.addAllowedHeader("*"); in the CorsConfiguration.

user_80001200

Most of the time this happens due to the invalid response type from server.

Make sure the following 2 to avoid this issue..

  1. You don't need to set any CORS headers in Angular side. it very well know how to deal with it. Angular expects the return data to be in json format. so make sure the return type is JSON even for the OPTIONS request.
  2. You Handle CORS in server side by using CORS header which is very self explanatory or you can google how to set CORS headers or middlewares.
user_22517010
Related