【报Bug】uni.downloadFile 返回的是400

示例代码：

const downloadTask = uni.downloadFile({
url: encodeURI(downMes.path), //仅为示例，并非真实的资源
filename: "_doc/update/",
success: res => {
console.log('88',res,downMes);
if (res.statusCode === 200) {
var path = res.tempFilePath;
waiting.setTitle('安装中...');
plus.runtime.install(path, {}, function() {
plus.nativeUI.closeWaiting();
if (downMes.type == 2) { // 热更新
uniToast('更新成功，重启中');
setTimeout(function() {
plus.runtime.restart();
}, 1500)
}
}, function(e) {
plus.nativeUI.closeWaiting();
plus.nativeUI.alert("安装失败[" + e.code + "]：" + e.message);
});
} else {
uniToast('升级失败，请稍后重试！');
}
}
});

操作步骤：

{ "tempFilePath": "_doc/uniapp_temp_1729071497890/download/", "statusCode": 400, "errMsg": "downloadFile:ok" }

预期结果：

，下载地址都获取到，打印出来是{ "tempFilePath": "_doc/uniapp_temp_1729071497890/download/下载地址", "statusCode": 400, "errMsg": "downloadFile:ok" }

实际结果：

，下载地址都获取到，打印出来是{ "tempFilePath": "_doc/uniapp_temp_1729071497890/download/", "statusCode": 400, "errMsg": "downloadFile:ok" }