Http.post posts data twice, why?

@travBrad wrote:

Hi there,

I’ve used the code below to save an object called position to a locally hosted json-server. Now I can successfully post to the array but every time that the post method is called, the data is saved twice causing duplicate entries. How do I prevent the duplicate entries?

saveToServer(pos) {
    this.position = pos;
    console.log("sendPosToServer" + JSON.stringify(this.position));
    var headers = new Headers();
    headers.append("Accept", 'application/json');
    headers.append('Content-Type', 'application/json');
    let options = new RequestOptions({ headers: headers});
    console.log("post params " + JSON.stringify(this.position));

    console.log("complete position, save");

    /*
    this.http.post(baseURL + 'positions', this.position, options)
              .map(res => console.log("first"))
              .share();
    */

      this.http.post(baseURL + 'positions', this.position, options)
        .subscribe(data => {
          console.log("First spot " + data['_body']);
        }, error => {
          console.log(error);
        });
    console.log("bottom of sendPosToServer");
  }

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