从Node.js服务器下载未命名文件时接收NotFoundError

我正在使用以下代码从Debian中的Node.js服务器下载文件：

var publicPath = __dirname + '/public';

app.get('/public/*', function (req, res) {
    var file = publicPath + req.path;
    res.sendFile(decodeURI(file));
}

除非文件未命名，否则文件将成功下载。例如，无法下载“ /public/.txt”或“ /public/.exe”（等效文件）。给出以下错误：

NotFoundError: Not Found
    at SendStream.error (/home/user/server/node_modules/send/index.js:270:31)
    at SendStream.pipe (/home/user/server/node_modules/send/index.js:585:14)
    at sendfile (/home/user/server/node_modules/express/lib/response.js:1099:8)
    at ServerResponse.sendFile (/home/user/server/node_modules/express/lib/response.js:429:3)
    at /home/user/server/server.js:279:6
    at Layer.handle [as handle_request] (/home/user/server/node_modules/express/lib/router/layer.js:95:5)
    at next (/home/user/server/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/home/user/server/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/home/user/server/node_modules/express/lib/router/layer.js:95:5)
    at /home/user/server/node_modules/express/lib/router/index.js:281:22
    at param (/home/user/server/node_modules/express/lib/router/index.js:354:14)
    at param (/home/user/server/node_modules/express/lib/router/index.js:365:14)
    at Function.process_params (/home/user/server/node_modules/express/lib/router/index.js:410:3)
    at next (/home/user/server/node_modules/express/lib/router/index.js:275:10)
    at expressInit (/home/user/server/node_modules/express/lib/middleware/init.js:40:5)
    at Layer.handle [as handle_request] (/home/user/server/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/home/user/server/node_modules/express/lib/router/index.js:317:13)
    at /home/user/server/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/home/user/server/node_modules/express/lib/router/index.js:335:12)
    at next (/home/user/server/node_modules/express/lib/router/index.js:275:10)
    at query (/home/user/server/node_modules/express/lib/middleware/query.js:45:5)

有什么方法可以在不命名的情况下下载这些文件？