如果你还没有从CRA中弹出，你不能轻易地修改你的webpack配置。配置文件隐藏在node_modules/react_scripts/config/webpackDevServer.config.js中。不建议您更改该配置。

相反，你可以将环境变量DANGEROUSLY_DISABLE_HOST_CHECK设置为true来禁用主机检查:

DANGEROUSLY_DISABLE_HOST_CHECK=true yarn start  
# or the equivalent npm command

我刚刚在使用Windows子系统for Linux (WSL2)时遇到了这个问题，所以我也将分享这个解决方案。

我的目标是在wsl:3000和localhost:3000中呈现webpack的输出，从而创建一个备用的本地端点。

如您所料，这最初会导致出现“无效主机头”错误。似乎没有什么帮助，直到我添加了如下所示的devServer配置选项。

module.exports = {
  //...
  devServer: {
    proxy: [
      {
        context: ['http://wsl:3000'],
        target: 'http://localhost:3000',
      },
    ],
  },
}

这在不引入任何安全风险的情况下修复了“错误”。

参考资料:webpack DevServer docs

当使用webpack 5的默认行为(没有配置文件)时，这篇文章:[https://stackoverflow.com/a/65268634/2544762 ']

"scripts": {
    "dev": "webpack serve --mode development --env development --hot --port 3000"
    ...
    ...
},
"devDependencies": {
    ...
    "webpack": "^5.10.1",
    "webpack-cli": "^4.2.0"
},

使用webpack 5帮助webpack服务——帮助:

Usage: webpack serve|server|s [entries...] [options]

Run the webpack dev server.

Options:
  -c, --config <value...>     Provide path to a webpack configuration file e.g.
                              ./webpack.config.js.
  --config-name <value...>    Name of the configuration to use.
  -m, --merge                 Merge two or more configurations using
                              'webpack-merge'.
  --env <value...>            Environment passed to the configuration when it
                              is a function.
  --node-env <value>          Sets process.env.NODE_ENV to the specified value.
  --progress [value]          Print compilation progress during build.
  -j, --json [value]          Prints result as JSON or store it in a file.
  -d, --devtool <value>       Determine source maps to use.
  --no-devtool                Do not generate source maps.
  --entry <value...>          The entry point(s) of your application e.g.
                              ./src/main.js.
  --mode <value>              Defines the mode to pass to webpack.
  --name <value>              Name of the configuration. Used when loading
                              multiple configurations.
  -o, --output-path <value>   Output location of the file generated by webpack
                              e.g. ./dist/.
  --stats [value]             It instructs webpack on how to treat the stats
                              e.g. verbose.
  --no-stats                  Disable stats output.
  -t, --target <value...>     Sets the build target e.g. node.
  --no-target                 Negative 'target' option.
  --watch-options-stdin       Stop watching when stdin stream has ended.
  --no-watch-options-stdin    Do not stop watching when stdin stream has ended.
  --bonjour                   Broadcasts the server via ZeroConf networking on
                              start
  --lazy                      Lazy
  --liveReload                Enables/Disables live reloading on changing files
  --serveIndex                Enables/Disables serveIndex middleware
  --inline                    Inline mode (set to false to disable including
                              client scripts like livereload)
  --profile                   Print compilation profile data for progress steps
  --progress                  Print compilation progress in percentage
  --hot-only                  Do not refresh page if HMR fails
  --stdin                     close when stdin ends
  --open [value]              Open the default browser, or optionally specify a
                              browser name
  --useLocalIp                Open default browser with local IP
  --open-page <value>         Open default browser with the specified page
  --client-log-level <value>  Log level in the browser (trace, debug, info,
                              warn, error or silent)
  --https                     HTTPS
  --http2                     HTTP/2, must be used with HTTPS
  --key <value>               Path to a SSL key.
  --cert <value>              Path to a SSL certificate.
  --cacert <value>            Path to a SSL CA certificate.
  --pfx <value>               Path to a SSL pfx file.
  --pfx-passphrase <value>    Passphrase for pfx file.
  --content-base <value>      A directory or URL to serve HTML content from.
  --watch-content-base        Enable live-reloading of the content-base.
  --history-api-fallback      Fallback to /index.html for Single Page
                              Applications.
  --compress                  Enable gzip compression
  --port <value>              The port
  --disable-host-check        Will not check the host
  --socket <value>            Socket to listen
  --public <value>            The public hostname/ip address of the server
  --host <value>              The hostname/ip address the server will bind to
  --allowed-hosts <value...>  A list of hosts that are allowed to access the
                              dev server, separated by spaces

Global options:
  --color                     Enable colors on console.
  --no-color                  Disable colors on console.
  -v, --version               Output the version number of 'webpack',
                              'webpack-cli' and 'webpack-dev-server' and
                              commands.
  -h, --help [verbose]        Display help for commands and options.

To see list of all supported commands and options run 'webpack --help=verbose'.

Webpack documentation: https://webpack.js.org/.
CLI documentation: https://webpack.js.org/api/cli/.
Made with ♥ by the webpack team.
Done in 0.44s.

解决方案

所以，只需添加——disable-host-check和webpack serve命令就可以了。

在包中。json，在“脚本”，添加参数——disableHostCheck=true 如:

"scripts": {
        "start": "ng serve --host=0.0.0.0 --configuration=dev --disableHostCheck=true"
}

更安全的选择是在你的Webpack配置中添加allowwedhosts，如下所示:

module.exports = {
devServer: {
 allowedHosts: [
  'host.com',
  'subdomain.host.com',
  'subdomain2.host.com',
  'host2.com'
   ]
  }
};

数组包含所有允许的主机，还可以指定子域名。点击这里查看更多信息

vue-cli用户注意事项:

将vue.config.js文件放在根目录下，使用相同的代码行:

module.exports = {
  configureWebpack: {
    devServer: {
      public: '0.0.0.0:8080',
      host: '0.0.0.0',
      disableHostCheck: true,
    }
  }
};