HarmonyOS 调用内部资源问题

async function getfirstnavData(): Promise<firstnavData[]> { 
  let dataList: firstnavData[] = [] 
  let httpRequest = http.createHttp(); 
  let response = httpRequest.request( 
    $r('app.string.systemconfig'), 
    { 
      method: http.RequestMethod.GET, 
      header: { 
        'Content-Type': 'application/json' 
      } 
    } 
  );