Angular 2 Token: Response for preflight has invalid HTTP status code 400

Question

I have an Angular2/TypeScript application running i Visual Studio Code.

An API running in VS 2015. This is the API project: http://www.asp.net/web-api/overview/security/

Answer 1

I was also facing same issue from last week and searched on google and stack overflow but all solutions in vein. but after lot of reading and investigation we have found below solution, we were facing issue in only POST method,GET called successfully.

Instead of directly passing Options we need to first stringify option object like JSON.stringify(options)

CreateUser(user:IUser): Observable {
        let headers = new Headers();
        headers.append('Content-Type', 'application/json');
        headers.append('Accept', 'application/json');
        let options = new RequestOptions({ headers: headers });
        return this._http.post('http://localhost:22736/api/Employee/Create', **JSON.stringify(options)**)
            .map((res: Response) => {
                return res.json();
            })
            .catch(this.handleError);
    }

It worked for me, Hope it will help others too.