get headers

service.ts

  // EC-3248: POST => spots/v1/
  public createSpot(spot: Spot): Observable<string> {
    const formData: FormData = new FormData();
    _.map(spot.filesToUpload, (toUpload: FileToUpload) => formData.append('files', toUpload.file, toUpload.file.name));
    formData.append('spot', JSON.stringify(spot));
    return this.http.post<string>(`${this._apiRoot}/spots/v1`, formData, { observe: "response"})
      .pipe(
        tap(resp => { console.log(resp.headers); }),
        map(resp => {
          const keys = resp.headers.keys();
          console.log(keys);
          keys.map(key => console.log(`${key}: ${resp.headers.get(key)}`));
        }),
        catchError((err: HttpErrorResponse) => {
          this.logger.error(`${this._constructorName}.createSpot()`, err);
          return new ErrorObservable(err);
        })
      );
  }