Angular 错误响应映射角度2

我有angular2代码用于获取服务

getkokabname(id){
  let url = "http://localhost:8080/regencies/name/"+id;
  let header = new Headers({'Content-Type': 'text/plain;charset=UTF-8'});
  return this.http.get(url, {headers: header})
  .map(this.extractData)
  .catch(this.handleError);
}

private extractData(res:Response) {
        let body = res.json();
        return body || [];
}

private handleError(error:any) {
      // In a real world app, we might use a remote logging infrastructure
      // We'd also dig deeper into the error to get a better message
      let errMsg = (error.message) ? error.message :
          error.status ? `${error.status} - ${error.statusText}` : 'Server error';
      console.error(errMsg); // log to console instead
      return Observable.throw(errMsg);
  }

如果我使用邮递员访问url。它返回的文本类似于KABUPATEN SUMENEP。但在我的代码中，它在JSON中的位置0处返回意外的标记K。如何解决这个问题

这是我访问值的代码

kokabname(){
    this.service.getkokabname(this.gov).subscribe(
      data=> this.governmentname = data,
      err => err
    )
  }

你的服务应该是

 getkokabname(id){
      let url = "http://localhost:8080/regencies/name/"+id;
      let header = new Headers({'Content-Type': 'text/plain;charset=UTF-8'});
      return this.http.get(url, {headers: header})
      .map(this.extractData)
      .catch(
                (error: Response) => {
                    return Observable.throw(error.json());
                });
    }