import { Injectable } from '@angular/core';
-import { Observable, of, EMPTY } from 'rxjs';
-import { Vorgang } from './vorgang';
import { HttpClient, HttpHeaders } from '@angular/common/http';
+import { Observable, of, EMPTY } from 'rxjs';
import { catchError, tap } from 'rxjs/operators';
+import { Vorgang } from './vorgang';
@Injectable({