AuthHttp doesn't send post payload

Question

I was using angular 4's default Http module to send http request without any problem. However, I recently replaced the Http module with AuthHttp from angular2-jwt package. Now with AuthHttp, it stopped sending body as payload to the server in post request. Here is the code:

return this.authHttp.post(url, JSON.stringify(body)).map((res: Response) => {
    // ...
});

The code above doesn't send the body as payload to the server. It sends the payload as expected when authHttp is replaced with http.

Not sure if I have done something wrong because it seems there's very few google results about this question.

Update:

With AuthHttp, Chrome Dev Tools shows only an OPTIONS request was sent . That's really weird.

Seems AuthHttp is sending some weird OPTIONS request to the server. Chrome shows the following error:

Response for preflight has invalid HTTP status code 400

Answer 1

Problem solved by adding the following code on the server:

if r.Method == "OPTIONS" {
    return
}