rest - Angular 2/Web Api - json parsing error syntax error unexpected end of input

Question

I have a Web API controller that looks like this:

    [HttpPost]
    public IHttpActionResult Test()
    {
        return Ok();
    }

This is correct syntax, However when I try to call this from a service in Angular 2, I get the error message: "json parsing error syntax error unexpected end of input." To resolve this issue, I have to put a value into the ActionResult such as

return Ok(1)

Am I missing some configuration? My Angular 2 service call looks like this:

return this.http.post(API/Controller/Test).map(res => res.json());

Answer 1

Another way:

All my http.get, post or put call (for uniformity):

.map(this.extractData)

In extractData (UPDATED: thanks to raykrow feedback, short code):

private extractData(res: Response) {        
    return res.text() ? res.json() : {}; ;
}