报错信息： VM6374:1 uploadFile:fail createUploadTask:fail Error: Invalid URL passed to App.getProxyForURL()' upFileHandler () {     wx.chooseImage({         count: 1,          success (res) {             const tempFilePaths = res.tempFilePaths             wx.uploadFile({                 url: '',                 filePath: tempFilePaths[0],                 name: 'image',                 formData: {                     'imgIndex': 0                 },                 header: {                 "Content-Type": "multipart/form-data"                   },                 success: function (res) {                     var data = JSON.parse(res.data);                 }             });         }     }) }