头条小程序登录40014 bad params

重点在 header，必须是json格式的。否则一直报错40014 参数无效

uni.request({
url: ‘https://developer.toutiao.com/api/apps/v2/jscode2session’, //仅为示例，并非真实接口地址。
data: {
appid: ‘ttece79a5a73de7b4801’,
secret: ‘962d92accd41817fa1b032171558c523fdbf5fec’,
code: loginRes.code,
anonymous_code: ‘’,
},
method: ‘POST’,
header: {
“Content-type”: “application/json”,
// “Content-type”: “application/x-www-form-urlencoded”
},
success: (res) => {
console.log(res.data);
}
});