按照https://github.com/tencentyun/wecos-ugc-upload-demo上面的操作来的

鉴权服务器应该是没有问题的，我用web试过可以成功上传文件

// upload.js

var REGION = 'ap-shanghai'

var APPID = 'xxx'

var BUCKET_NAME = 'xx'

var cosUrl = "https://" + REGION + ".file.myqcloud.com/files/v2/" + APPID + "/" + BUCKET_NAME

//填写自己的鉴权服务器地址

var cosSignatureUrl = 'xxx'

/**

* 上传方法

* filePath: 上传的文件路径

* fileName： 上传到cos后的文件名

*/

function upload(filePath, fileName) {

    // 鉴权获取签名

    wx.request({

        url: cosSignatureUrl,

        success: function (cosRes) {

            // 签名

            var signature = cosRes.data

            // 头部带上签名，上传文件至COS

            wx.uploadFile({

                url: cosUrl + '/' + fileName,

                filePath: filePath,

                header: {

                    'Authorization': signature

                },

                name: 'filecontent',

                formData: {

               &n