我用node.js 进行微信小程序下单，源码是

await this.node_req({

url: "https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi",

method:"POST",

header:{

'Content-Type': 'application/json',

'Accept': 'application/json',

"Authorization": 'authHeader',

'User-Agent':'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36',

},

body:JSON.stringify(set.data.payment)

})

返回的是 {"code":"INVALID_REQUEST","message":"Http头缺少Accept或User-Agent"} 这是啥问题？要怎么处理啊？