{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','https://www.manongdao.com/data/attach/logo/logo.png', '推荐 萌系小妹纸 的问题《Cannot GET / error with my webpack-dev-middleware》','https://www.manongdao.com/q-810203.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}
First of all, I found many similar topics here but even after referring to them, I still haven't been able to get it working at all.
So, my problem simply is that I get Cannot GET / in Chrome when I visit localhost:3000 after running my express server (using npm run serve). It's not that it cannot find the bundle.js file; it simply cannot find the index.html.
I don't see any errors on the server console when I run npm run serve script in the package.json file. Webpack build (called from Webpack-dev-middleware) log shows no errors either.
It works correctly if I run webpack-dev-server directly from the terminal and visit to the same URL. (I have overridden the host and port to match the ones I am using in the express server, through devServer options in webpack.config.js.)
What am I doing wrong?
Folder structure
/client
/main.js
/dist
/index.html
/assets/
/server
/server.js
/webpack.config.js
/package.json
webpack.config.js
const path = require('path');
module.exports = {
entry: './client/main.js',
output: {
path: path.resolve(__dirname, 'dist/assets'),
filename: 'bundle.js',
publicPath: '/assets/'
},
module: {
rules: [
{
use: 'babel-loader',
test: /\.jsx?$/,
exclude: /node_modules/,
},
{
use: ['style-loader', 'css-loader', 'sass-loader'],
test: /\.scss$/
}
]
},
devServer: {
host: 'localhost',
port: 3000,
historyApiFallback: true,
contentBase: path.resolve(__dirname, 'dist'),
}
};
/dist/index.html
<!DOCTYPE html>
<html>
<head>
<title>Webpack-Dev-Middleware Test</title>
</head>
<body>
<div id="app-container">
</div>
<script src="/assets/bundle.js"></script>
</body>
</html>
/server/server.js
const express = require('express');
const path = require('path');
const app = express();
const port = process.env.PORT || 3000;
if (process.env.NODE_ENV !== 'production') {
var webpackDevMiddleware = require("webpack-dev-middleware");
var webpack = require("webpack");
var config = require('./../webpack.config');
var compiler = webpack(config);
app.use(webpackDevMiddleware(compiler, {
publicPath : config.output.publicPath,
}));
} else {
app.use(express.static(path.resolve(__dirname + '/../dist/')));
app.get('*', (req, res) => {
res.sendFile(path.resolve(__dirname + '/../dist/index.html'));
});
}
app.listen(port, () => console.log('Started on port:', port));
The problem is that you don't really serve
index.htmlanywhere in the webpack block. You should either use plugin such ashtml-webpack-loaderto serve it on memory or use express's static function, which I think the more desirable (more webpack way) solution is the former one.Below is the example of using
html-webpack-loader.