webpack-dev-server，historyApiFallback 不工作(webpack-4，react-router-4) [英] webpack-dev-server, historyApiFallback not working (webpack-4, react-router-4)

问题描述

我正在用 webpack4 测试 react-router4，但是我无法获得 webpack-dev-server 的设置:

{historyApiFallback: true}

上班.这个用法在 webpack3 中工作得很好，所以我不确定是什么问题......这是我的 webpack.config.js:

const HtmlWebpackPlugin = require('html-webpack-plugin');module.exports = () =>{返回 {模式:'发展'，开发工具:'源地图'，开发服务器:{端口:8888，historyApiFallback: 真,统计数据:'最小'},解决: {扩展名:['*', '.mjs', '.js', '.jsx']},模块: {规则: [{测试:/\.m?jsx?$/,排除:/(节点模块)/，用: {loader: 'babel-loader'}}]},插件: [新的 HtmlWebpackPlugin({标题:'反应实验室'，模板:'src/index.html'})]}}

这是我使用 react-router4 的简单反应应用程序:

从'react'导入React；从 'react-dom' 导入 ReactDOM；进口 {BrowserRouter 作为路由器，路线，关联，转变来自'反应路由器-dom';const mountNode = document.getElementById('app');const App = () =>(<路由器><div><ul><li><Link to="/">链接到://Link></li><li><Link to="/page1">链接到:/page1</Link></li><li><Link to="/page2">链接到:/page2</Link></li><li><Link to="/does/not/exist">链接到:/does/not/exist</Link></li><button onClick={()=>{location.reload();}}>重新加载页面</button><开关><路由精确路径="/" component={()=>(<h2>home</h2>)}/><路由精确路径="/page1" component={()=>(<h2>page1</h2>)}/><路由精确路径="/page2" component={()=>(<h2>page2</h2>)}/><路由组件={()=>(<h2>不匹配</h2>)}/></开关><Route path="/" component={(props) =><div>{`props.location.pathname: ${props.location.pathname}`}</div>}/>

</路由器>);ReactDOM.render( <App/>, mountNode

导航到:

然后点击

重新加载页面

webpack 开发服务器无法重定向到 main.js

这里是github上的完整代码:https://github.com/ApolloTang/webpack-dev-server-history-api-fall-back-not-working.

任何帮助或评论将不胜感激.

解决方案

原来我在 webpack.config.js 中缺少 output.publicPath:

输出:{//必须指定 output.publicPath 否则//devServer.historyApiFallback 不起作用公共路径:'/'},

使用如上指定的 output.publicPath，historyApiFallback 有效.

我不记得我在哪里读过说 output.publicPath 在 webpack4 的配置中是一个可选的，但它确实需要与 webpack-dev-server 一起使用.

https://webpack.js.org/configuration/output 上的文档/#output-publicpath 说:

<块引用>

webpack-dev-server 也从 publicPath 得到一个提示，用它来确定从哪里提供输出文件.

但我不明白这与 historyApiFallback 有什么关系.

I am testing out react-router4 with webpack4, but I can't get webpack-dev-server's setting:

{historyApiFallback: true}

to work. This use to work just fine in webpack3, so I am not sure what is wrong... Here is my webpack.config.js:

const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = () => {
  return {
    mode: 'development',
    devtool: 'source-map',
    devServer: {
      port: 8888,
      historyApiFallback: true,
      stats: 'minimal'
    },
    resolve: {
      extensions: ['*', '.mjs', '.js', '.jsx']
    },
    module: {
      rules: [
        {
          test: /\.m?jsx?$/,
          exclude: /(node_modules)/,
          use: {
            loader: 'babel-loader'
          }
        }
      ]
    },
    plugins: [
      new HtmlWebpackPlugin({
        title:'React Lab',
        template: 'src/index.html'
      })
    ]
  }
}

and here is my simple react app with react-router4:

import React from 'react';
import ReactDOM  from 'react-dom';
import {
  BrowserRouter as Router,
  Route,
  Link,
  Switch
} from 'react-router-dom';

const mountNode = document.getElementById('app');

const App = () => (
  <Router>
    <div>

      <ul>
        <li><Link to="/">Link to: /</Link></li>
        <li><Link to="/page1">Link to: /page1</Link></li>
        <li><Link to="/page2">Link to: /page2</Link></li>
        <li><Link to="/does/not/exist">Link to: /does/not/exist</Link></li>
      </ul>
      <button onClick={()=>{location.reload();}}>reload page</button>

      <Switch>
        <Route exact path="/"      component={()=>(<h2>home</h2>)} />
        <Route exact path="/page1" component={()=>(<h2>page1</h2>)} />
        <Route exact path="/page2" component={()=>(<h2>page2</h2>)} />
        <Route                     component={()=>(<h2>no match</h2>)} />
      </Switch>

      <Route path="/" component={(props) =><div>{`props.location.pathname: ${props.location.pathname}`}</div>} />

    </div>
  </Router>
);

ReactDOM.render( <App/>, mountNode

After navigating to:

<Link to="/does/not/exist" /> 

and click

<button>reload page</button>

webpack dev server fail to redirect to main.js

Here is the complete code at github: https://github.com/ApolloTang/webpack-dev-server-history-api-fall-back-not-working.

Any help or comment would greatly appreciated.

解决方案

It turns out that I am missing output.publicPath in webpack.config.js:

output: {
  //  must specified output.publicPath otherwise
  //  devServer.historyApiFallback will not work
  publicPath: '/'
},

with output.publicPath specified as above, historyApiFallback works.

I can't remember where I have read that said output.publicPath is an optional in webpack4's configuration, but it does required to work with webpack-dev-server.

The documentation at https://webpack.js.org/configuration/output/#output-publicpath said:

The webpack-dev-server also takes a hint from publicPath, using it to determine where to serve the output files from.

But I don't understand how is this to do with hisitoryApiFallback.

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