后端SpringBoot及vue proxyTable解决跨域

1. 背景

昨天上线项目遇到了一个奇怪的问题，本来服务实在腾讯云的轻量应用服务器的，
但是迁移到一个香港的服务器之后就出现了各种各样的问题。
Nginx 开启Https Springboot开启Https，先后出现了
ERROR_CONNECT_RESET, ERROR_CONNECT_REFUSE噔噔蹬蹬
但是我其实已经部署了一个项目了的，那个用的proxyTable,新部署的这个用的是vue-template-admin里边的env控制的。
后来改成proxyTable就好了。

2. 配置proxyTable

1. 创建config.js

const path = require('path')
const url = require('url')
const resolve = dir => {
  return path.join(__dirname, '.', dir)
}
const PROXY = {
  REMOTE_URL: 'http://remote_url'
}

module.exports = {
  alias: {
    Views: resolve('src/views'),
    STYLE: resolve('src/assets/Styles'),
    STATIC: resolve('public/static'),
    vue$: 'vue/dist/vue.esm.js'
  },
  proxyTable: {
    '/contextPath': {
      target: PROXY.REMOTE_URL,
      changeOrigin: true,
      pathRewrite: {
        '^/contextPath': '/contextPath'
      }
    }
  }
}

2. 在vue.config.js中引入config.js

主要是 devServer里边的 proxy: Config.proxyTable

'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')
const Config = require('./config')
function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'vue Admin Template' // 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 = 9528 npm run dev OR npm run dev --port = 9528
const port = process.env.port || process.env.npm_config_port || 9528 // 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: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: false,
  productionSourceMap: false,
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    // https: true,
    // before: require('./mock/mock-server.js')
    proxy: Config.proxyTable
  },
  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')
      }
    }
  },
  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial'
      }
    ])

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')

    // 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()

    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
              }
            }
          })
          // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
          config.optimization.runtimeChunk('single')
        }
      )
  }
}