ArkTS中HTTP请求如何以JSON形式进行传输

import { http } from '@kit.NetworkKit'; 
 
class Header { 
  public contentType: string; 
  constructor(contentType: string) { 
    this.contentType = contentType; 
  } 
} 
let httpRequest = http.createHttp(); 
let promise = httpRequest.request("EXAMPLE_URL", { 
  method: http.RequestMethod.GET, 
  connectTimeout: 60000, 
  readTimeout: 60000, 
  header: new Header('application/json') 
});