Vue代理报错404问题

问题描述：

代理后出现404：

第一种路径拼接 /api 情况

const path = require('path');

function resolve(dir) {
    return path.resolve(__dirname, dir)
}
module.exports = {
    publicPath: process.env.NODE_ENV === "production" ? "./" : "/",
    assetsDir: "assets",
    configureWebpack: {
        resolve: {
            extensions: ['.js', '.vue', '.json'],
            alias: {
                '@': resolve('src'),
                'assets': resolve('src/assets'),
                'css': resolve('src/assets/css'),
                'images': resolve('src/assets/images'),
                'views': resolve('src/views'),
                'components': resolve('src/components'),
                'api': resolve('src/api'),
                'mixins': resolve('src/mixins'),
                'store': resolve('src/store'),
                'service': resolve('src/service'),
            }
        }
    },
    devServer: {
        port: 8081,
        hot: true,
        // open: 'Chrome',
        proxy: {
            // change xxx-api/login => mock/login
            // detail: https://cli.vuejs.org/config/#devserver-proxy
            '/api': {
                target: 'https://www.xxxxxx.com/', 
                changeOrigin: true,
                secure: true,
                pathRewrite: {
                    '^/api': '/'
                }
            },
        },
    },
    css: {
        loaderOptions: {
            css: {},
            postcss: {
                plugins: [
                    require('postcss-px2rem')({
                        remUnit: 192
                    })
                ]
            }
        }
    },
    productionSourceMap: false,
};

使用如下：

结果如下：

缺点 ：打包后的请求路径会多个 /api

第二种路径不变情况

这种写法也可以：

注意：这时候就按原来的路径就可以了；

结果如下：

缺点：配置多个代理要注意代理的先后顺序；

注意点

代理的顺序：从前往后匹配的，先匹配到哪个就用哪个；

新增说明：配置多个代理怎么搞？

配置多个代理怎么搞？

'use strict'
const path = require('path')
// const SkeletonWebpackPlugin = require('vue-skeleton-webpack-plugin')
const defaultSettings = require('./src/settings.js')

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'xxx' // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9527 npm run dev OR npm run dev --port = 9527
const port = process.env.port || process.env.npm_config_port || 9527 // dev port

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
  // publicPath: process.env.ENV === 'production' ? '/' : '/',
  publicPath: process.env.ENV === 'production' ? '/' : '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  devServer: {
    host: 'localhost',//target host
    port: port,
    overlay: {
      warnings: false,
      errors: true
    },
    proxy: {
      [process.env.VUE_APP_BASE_BRAND_API]: {
        target: 'http://10.44.62.64:8090',
        changeOrigin: true,
        pathRewrite: {
          ['^' + process.env.VUE_APP_BASE_BRAND_API]: ''
        }
      },
      // change xxx-api/login => mock/login
      // detail: https://cli.vuejs.org/config/#devserver-proxy
      [process.env.VUE_APP_BASE_API]: {
        // target: 'http://localhost:3100',
        target: 'http://xx.xxx.xx.x:3100',
        // target: `http://127.0.0.1:${port}/mock`,
        changeOrigin: true,
        pathRewrite: {
          ['^' + process.env.VUE_APP_BASE_API]: ''
        }
      },
    },
    // proxy:{
    //   // 当你请求是以/api开头的时候，则我帮你代理访问到http://localhost:3000
    //   // 例如：
    //   // /api/users  http://localhost:3000/api/users
    //   // 我们真是服务器接口是没有/api的
    //   "":{
    //     target:"http://localhost:31009",
    //     changeOrigin: true,// 如果接口跨域，需要进行这个参数配置
    //     pathRewrite:{"^":""}
    //   }
    // }
    // after: require('./mock/mock-server.js')
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    }
  },
  // css: {
  //   extract: true // 是否使用css分离插件 ExtractTextPlugin（开启骨架屏必须这个配置）
  // },
  chainWebpack(config) {
    config.plugin('html').tap(args => {
      // 添加初始化变量
      args[0].monitorId = process.env.VUE_APP_MONITOR_ID
      return args
    })

    config.plugins.delete('preload') // TODO: need test
    config.plugins.delete('prefetch') // TODO: need test

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    // set preserveWhitespace
    config.module
      .rule('vue')
      .use('vue-loader')
      .loader('vue-loader')
      .tap(options => {
        options.compilerOptions.preserveWhitespace = true
        return options
      })
      .end()

    config
      // https://webpack.js.org/configuration/devtool/#development
      .when(process.env.NODE_ENV === 'development',
        config => config.devtool('cheap-source-map')
      )

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
              // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
            .end()
          config
            .optimization.splitChunks({
              chunks: 'all',
              cacheGroups: {
                libs: {
                  name: 'chunk-libs',
                  test: /[\\/]node_modules[\\/]/,
                  priority: 10,
                  chunks: 'initial' // only package third parties that are initially dependent
                },
                elementUI: {
                  name: 'chunk-elementUI', // split elementUI into a single package
                  priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                  test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                },
                commons: {
                  name: 'chunk-commons',
                  test: resolve('src/components'), // can customize your rules
                  minChunks: 3, //  minimum common number
                  priority: 5,
                  reuseExistingChunk: true
                }
              }
            })
          config.optimization.runtimeChunk('single')
        }
      )

    // 骨架屏配置
    // config
    //   .plugin('SkeletonWebpackPlugin')
    //   .use(new SkeletonWebpackPlugin({
    //     webpackConfig: {
    //       entry: {
    //         app: resolve('src/skeleton.js'),
    //       }
    //     },
    //     minimize: true,
    //     quiet: true,
    //     router: {
    //       mode: 'history',
    //       routes: [{
    //         path: '*',
    //         skeletonId: 'common-skeleton'
    //       }]
    //     }
    //   }))
  }
}

注意.env.development中的配置

NODE_ENV = 'development'

# just a flag
ENV = 'development'

# base api（当使用mock.js时，切换dev-api）
# VUE_APP_BASE_API = '/dev-api'
VUE_APP_BASE_API = ''

# vue-cli uses the VUE_CLI_BABEL_TRANSPILE_MODULES environment variable,
# to control whether the babel-plugin-dynamic-import-node plugin is enabled.
# It only does one thing by converting all import() to require().
# This configuration can significantly increase the speed of hot updates,
# when you have a large number of pages.
# Detail:  https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/babel-preset-app/index.js

VUE_CLI_BABEL_TRANSPILE_MODULES = true

# 图片和附件上传文件夹
VUE_APP_OSS_FOLDER='test/xxx/'

# 品牌项目 （这里为了代理，要多加个 /brand，当然可以自己定义）
VUE_APP_BASE_BRAND_API = '/brand'

配置了 .env.development 中的代理路径后，这样api接口js文件中就不用多写个 /brand，不用写成 /brand/saveOrUpdate ，请求路径也会存在 /brand ，baseURL拼接的原因，这样打包也并不影响，毕竟打包的是生产环境的路径；