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My ionic app is connecting to asp.net web api on azure. The API already allow all origin to access and the API_KEY header. However I am still getting Message "The origin 'http://localhost:8100' is not allowed." on both Ionic serve and ionic view

Code in ionic app

var headers = new Headers();
headers.append('API_KEY', 'X-some-key');
headers.delete("Origin");
let options = new RequestOptions({ headers: headers});
return this.http.get(url, options);

request and response header when using ionic serve image

Koigokoro
  • 31
  • 3

1 Answers1

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Found the answer from here : CORS enabled but response for preflight has invalid HTTP status code 404 when POSTing JSON

The problem is backend doesn't have OPTIONS handler, added OPTIONS handler in web.config works.

Koigokoro
  • 31
  • 3