如何使用react-router v4“staticContext”处理异步路由？

Question

在我的反应SSR项目中实现异步路由（我使用loadable-components）之后。我发现staticContext不起作用。如果我使用静态路由组件而不是异步组件，staticContext将按预期工作。有什么建议吗？

这是我的NotFound页面：

import React from 'react';
import Helmet from 'react-helmet';

import styles from './styles.scss';

type Props = { staticContext: Object };

export default ({ staticContext }: Props) => {
  // I assing the 404 status here
  if (staticContext) staticContext.status = '404';

  return (
    <div className={styles.NotFound}>
      <Helmet title="Oops" />
      <p>Oops, Page was not found!</p>
    </div>
  );
};

然后我从server.js：

检查状态

...

const staticContext = {};
      const AppComponent = (
        <Provider store={store}>
          {/* Setup React-Router server-side rendering */}
          <StaticRouter location={req.url} context={staticContext}>
            {renderRoutes(routes)}
          </StaticRouter>
        </Provider>
      );

      if (staticContext.url) {
        res.status(301).setHeader('Location', staticContext.url);
        res.end();

        return;
      }

      // Extract loadable state from application tree (loadable-components setup)
      getLoadableState(AppComponent).then(loadableState => {
        const head = Helmet.renderStatic();
        const assets = webpackIsomorphicTools.assets();
        const htmlContent = renderToString(AppComponent);
        const initialState = store.getState();
        const loadableStateTag = loadableState.getScriptTag();

        // I can't get the "404" error 
        const status = staticContext.status === '404' ? 404 : 200;

...

反应：16.2.0 react-router：4.2.2 节点：9.5.0