给你一个环境种子，https://github.com/hjzheng/gu...
我在实际项目中用过，里面有http-proxy-middleware 和 broswerSync的用法

在服务器端配置CORS

  var server = {
    baseDir: baseDir,
    routes: routes
  };

  /*
   * You can add a proxy to your backend by uncommenting the line below.
   * You just have to configure a context which will we redirected and the target url.
   * Example: $http.get('/users') requests will be automatically proxified.
   *
   * For more details and option, https://github.com/chimurai/http-proxy-middleware/blob/v0.9.0/README.md
   */
  server.middleware = [proxyMiddleware(['/api'], {target: 'http://localhost:8080', changeOrigin: true}),
    proxyMiddleware(['/upload'], {target: 'http://localhost:8080', changeOrigin: true}),
    proxyMiddleware(['/a/login'], {target: 'http://localhost:8080', changeOrigin: true}),
    proxyMiddleware(['/a/ajaxlogin'], {target: 'http://localhost:8080', changeOrigin: true}),
    proxyMiddleware(['/a/logout'], {target: 'http://localhost:8080', changeOrigin: true})];

  browserSync.instance = browserSync.init({
    startPath: '/',
    server: server,
    browser: browser
  });

大哥，解决了吗？
求方案。
我这样设置实际不行好像。

var middlewares = proxyMiddleware(['/api'], {target: 'http://0.0.0.0:8080', changeOrigin: true});

browserSync({
  port: 8888,
  ui: {
    port: 8889
  },
  server: {
    baseDir: 'src',

    middleware: [
      middlewares,
      ...

使用我是data/baggage/getValidateCode.do，
结果404