Also fix CSRF token. This was probably broken since csurf middleware was
modified to use cookie instead of session storage to provide support for
single page app (SPA).
react-router v4 was made before React introduced a more performant
function renderToNodeStream to replace renderToString. All guides for
react-router are made using renderToString method, but I would love to
use the renderToNodeStream instead.
Since we cannot issue a 302 redirect after the page has already been
rendered (because status codes are written first), we can display a
<a> link with a text message. Once the React client-side library
hydrates the DOM Tree, the redirect should happen client side, so no
user action should be required.
This idea was taken from:
https://github.com/ReactTraining/react-router/issues/6191
