The rendering server responds to the v4 router if 404

Question

In response-router v3, we could know when the server-side rendering did not match the current URL. This allowed me to submit a request for my middleware express.staticinstead of sending the displayed application.

In response-router v4 we should use

    const htmlData = renderToString(
        <StaticRouter
            location={req.url}
            context={context}
        >
            <App/>
        </StaticRouter>
    );

for server side rendering. However, it automatically redirects everything to /. Why does this behavior exist? Could we just make a mistake, how do we expect him to fail helplessly?

How could I know that nothing was agreed so that I could call next(), and other express routes did the job?

Here is the whole function that I would like to use:

app.get('*', (req, res, next) => {
    const context = {};
    const htmlData = renderToString(
        <StaticRouter
            location={req.url}
            context={context}
        >
            <App/>
        </StaticRouter>
    );

    console.log(JSON.stringify(context, null, 4)); // empty object
    if (context.url) { // <------------------------ Doesn't work (taken from example and thought it would contain the unmatched url)
        winston.info(`Passing ${req.url} along`);
        next(); // <--------------- Never called even if no route matches.
    } else {
        res.send(pageContent.replace('<div id="main"></div>',
            `<div id="main">${htmlData}</div>`));
    }
});

this, // somewhere else , .

, . Router.jsx, Route s.

import React from 'react';
import PropTypes from 'prop-types';
import {
    BrowserRouter,
    Route,
} from 'react-router-dom';
import App from './components/App.jsx';

export const Status = ({ code, children }) => (
    <Route render={({ staticContext }) => {
        if (staticContext) {
            staticContext.status = code;
        }
        return children;
    }}/>
);

Status.propTypes = {
    code     : PropTypes.number.isRequired,
    children : PropTypes.node.isRequired,
};

export const NotFound = () => (
    <Status code={404}>
        <div>
            <h1>Sorry, can’t find that.</h1>
        </div>
    </Status>
);

class Router extends React.Component {
    render() {
        return (
            <BrowserRouter>
                <div>
                    <Route exact path="/" component={App}/>
                    <Route component={NotFound}/>
                </div>
            </BrowserRouter>
        );
    }
}

export default Router;

( , , StaticRouter App Router.jsx, Route App, , .

Answer 1

NotFoundPage App.jsx, Route.jsx, .

<Switch>
    <Route exact path="/" component={AppRootComponent}/>
    <Route component={NotFound}/>
</Switch>

, - - v4.