Node.js 如果仅在 Assets 文件夹中找不到文件，则快速返回 404

Question

I am trying to create an SPA using Express with following code

var express = require('express');
const path = require('path');

var app = express();

app.use('/assets', express.static(path.resolve(__dirname, 'www', 'assets')));

app.get('/*', (req, res)=>{
     res.sendFile(path.resolve('www', 'index.html'));
});

var server = app.listen(3000, function(){});

This code works good but the problem is this responds with my index.html even when a file is not found in my assets folder. I want it to respond with error of 404 Not Found if some url is not present in assets folder

I tried using this code after line app.use('/assets'...

app.use(function (req, res, next) {
    res.status(404).send("404 Not Found");
});

but not working

Answer 1

Issue is with

app.get('/*', (req, res)=>{
     res.sendFile(path.resolve('www', 'index.html'));
});

Instead, use

app.get('/', (req, res)=>{
         res.sendFile(path.resolve('www', 'index.html'));
    });

Answer 2

So, I finally got the way to solve it

app.get('/*', (req, res)=>{
    if(req.path.includes('/assets'))
    {
        fs.access(req.path, (err) => {
            if(err) 
            {
                res.status(404).send("Sorry can't find that!");
                return;
            }
        });
    }
    res.sendFile(path.resolve('www', 'index.html'));
});

In the code, I have told to check if the request is about a file located in assets folder then check if the file exists, if does not exists then send 404 error with message and just return, otherwise do nothing but return the file.