Angular HTTP Error Empty Untyped Response

First you have to check few things to make sure your setup is correct.

1. Check in server side whether you are sending the proper JSON encoded response for the first time request i.e the response is correctly serialized or not.

2. check if the payload for the POST request this.body is already converted to json string or not if you are posting json data to server . You should use JSON.stringify(this.body) before sending the request if you are sending json data.

3. you should use map()/catch() in you post() method to actually map the response and catch the actual error.

So your code should look like below

MyService.ts:

doPost(body:any): Observable<Response> {   let payload = JSON.stringify(body); // Stringify payload if you are using JSON data   let headers      = new Headers({ 'Content-Type': 'application/json' }); // ... Set content type to JSON for json request   let options      = new RequestOptions({ headers: headers }); // Create a request option   return this.http.post(this.resourceUrl, payload,options)                        .map((res:Response) => res.json()) // ...and calling .json() on the response to return data                        .catch((error:any) => Observable.throw(error.json().error || 'Server error')); //...errors if any;}

MyComponent.ts:

handleClickPost() {    this.myService.doPost(this.body)    .subscribe(        (res: any) => {            this.responseOk = true;        },        (err: any) => {            // Log errors if any            console.log(err);           }        }    );}

or you can create a separate error handler for the catch() method like below

private handleError(error: any) {      let errMsg = (error.message) ? error.message : error.status ? `${error.status} - ${error.statusText}` : 'Server error';       console.log(errMsg); // log to console instead        return Observable.throw(errMsg);    }

and use it this way .catch(this.handleError) in your service class.

Seems like an issue of preflight Http OPTIONS request. Did you verify the response type.

If it is this issue you can avoid the preflight request by modifying the content-header as below.

   $http.defaults.headers.post["Content-Type"] = "text/plain"

Read more here: Why am I getting an OPTIONS request instead of a GET request?