vue 404 error: causes and solutions

In Vue projects, 404 errors usually mean that the browser cannot find the requested page or resource on the server, which may bring a bad experience to the user. In this article, we will discuss how to resolve 404 errors in Vue projects.

1. Confirm the request path
   First, check whether the requested path is correct. Vue is a single page application (SPA), which means that all pages and resources are managed by Vue routers. If the request path is not defined and routed correctly, it will not be found and will result in a 404 error. Ensuring that paths and routes match is the first step in resolving 404 errors.
2. Configuring the Server
   If you need to deploy your Vue project to a production environment, you need to properly configure your web server to allow the Vue application to run on the correct path. This usually requires installing a URL rewrite module on the server, such as mod_rewrite (in Apache) or ngx_http_rewrite_module (in Nginx), to handle Vue's routing mode. This will ensure that if a URL request corresponds to any route in Vue, the correct page will be returned.
3. Configuring Webpack
   Webpack is a commonly used JavaScript module packager. Webpack is generally used for packaging and deployment in Vue projects. Although Webpack can handle many files by default, it may not properly handle the dynamic routing that occurs when packaging a Vue project. In order for Webpack to package and handle dynamic routing correctly, we need to provide configuration for Vue routing and Webpack in the webpack.config.js file, as shown below:

const path = require('path')
module.exports = {
  ...
  resolve: {
    alias: {
      '@': path.resolve(__dirname, 'src'),
      'vue$': 'vue/dist/vue.esm.js'
    }
  },
  devServer: {
    historyApiFallback: true
  }
}

This configuration will ensure that Webpack is packaging Vue The project correctly handles dynamic routing and allows Webpack to configure historyApiFallback to ensure that the development server can correctly return to the default Vue route when it cannot find the specified path.

4. Configure 404 page
   Finally, we can configure a 404 page to improve the user experience. When users access an invalid page, it will be more friendly to jump to a customized 404 page. In the Vue project, we can create a component named "NotFound.vue" and define a wildcard route in the Vue route, so that when the route cannot be matched, the page will redirect to the "NotFound.vue" component.

The principle is that wildcard routing matches any URL and passes its match to the NotFound.vue component. The code is as follows:

{
  path: '*',
  name: 'notFound',
  component: () => import('@/views/NotFound.vue')
}

Summary
404 errors in Vue projects This is usually due to an incorrect request path, a web server configuration issue, or a Webpack configuration error. When dealing with 404 errors in Vue projects, please conduct detailed troubleshooting to ensure that the routing and resource paths are correct, the server and Webpack are configured correctly, and provide users with a friendly 404 page prompt.

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