requestTask.onHeadersReceived 怎么使用 - WXOPEN Club

求大神帮忙：

项目需求：要监听 Response Headers 中的信息

报错：Cannot read property ‘onHeadersReceived’ of undefined

const requestTask = wx.request({

url: rootDocment + $api.home.porList,

data: {},

method: 'get',

header: {

'Content-Type': 'application/x-www-form-urlencoded',

Authorization: token

},

success(res) {

console.log(res.data)

}

})

requestTask.onHeadersReceived((res) => {

console.log('onHeadersReceived: ', res)

console.log('获取到了header')

})

请具体描述问题出现的流程，并提供能复现问题的简单代码片段（https://developers.weixin.qq.com/miniprogram/dev/devtools/minicode.html）。