如果没有定义查询参数，如何重定向到root？

server {
    listen 80;
    server_name example.com;

    location / {
        if ($query_string = "") {
            return 301 http://$host/;
        }
        proxy_pass http://backend;
    }
}

RewriteEngine On
RewriteCond %{QUERY_STRING} ^$
RewriteRule ^(.*)$ / [R=301,L]

const express = require('express');
const app = express();

app.use((req, res, next) => {
    if (Object.keys(req.query).length === 0) {
        return res.redirect('/');
    }
    next();
});

app.get('/somepath', (req, res) => {
    res.send('This is some path');
});

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});

from flask import Flask, redirect, request

app = Flask(__name__)

@app.before_request
def redirect_to_root():
    if not request.args:
        return redirect('/')

@app.route('/somepath')
def somepath():
    return 'This is some path'

if __name__ == '__main__':
    app.run(debug=True)

const MongoClient = require('mongodb').MongoClient;
const uri = "your_mongodb_uri";
const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });

client.connect(err => {
    if (err) throw err;
    const collection = client.db("your_database").collection("your_collection");

    const query = {}; // 如果没有定义查询参数，使用空对象

    collection.find(query).toArray((err, result) => {
        if (err) throw err;
        console.log(result);
        client.close();
    });
});