HTTP authorization headers not send with codeigniter api in ionic 2 - ionic-framework

Question

In API they call without Authorization is fine.
How to set header for it?
"thanks"
let headers: Headers = new Headers({ 'Authorization': token, 'Content-Type': 'application/json; charset=UTF-8' });`
let options: RequestOptions = new RequestOptions({headers: headers});
let params: URLSearchParams = new URLSearchParams();
params.append('latitude', '23.259933');
params.append('longitude', '77.412615');
params.append('nearby', '5');
return this.http.post(baseUrl, params, options)
.map(
(response: Response)=>{
return response;
}
)
Chrome console:
Response for preflight has invalid HTTP status code 404

Answer 1

This happens because the browser sends the headers of your request to the server before sending the actual request (what is called preflight) so as to verify your request complies with the CORS policy that is defined in the server's configuration.
So what you need to do is double check that the server you are contacting is configured properly to accept the request as you make it.
Make sure that your backend server is accepting not only the POST request but also an OPTIONS request for the same endpoint url. The OPTIONS request should just return with the success 200 code.
On that server you probably have something like "when a user hits endpoint /abc with request type POST, then return some data". You also need something that says "when a user hits endpoint /abc with request type OPTIONS return 200 OK"
If all else fails you could try using this plugin in your browser, but keep in mind this will help only continuing development and is a band-aid solution that won't work in production of course.