HarmonyOS 鸿蒙Next Http 使用问题

我有一个 RequestParams 数组，

export class RequestParams { key : string = ‘’ value: string|number = ‘’; }  

会作为参数传给 httpRequest 方法，但现在作为 extraData 传入，请求参数会有问题，请问要怎么写？

 export function httpRequest(method: http.RequestMethod, url: string, payload?: RequestParams[]): Promise<ApiResponse> { let httpRequest = http.createHttp(); let responseResult = httpRequest.request(url, { method: method, readTimeout: Const.HTTP_READ_TIMEOUT, header: { }, connectTimeout: Const.HTTP_READ_TIMEOUT, extraData: payload });