title: land IndexRoute after refresh
body: <p>I'm writing SPA app with React-Router. </p>
  
  <p><strong>Question:</strong> <em>how to make my app land on IndexRoute after refresh from <code>signIn</code> path?</em></p>
  
  <pre><code>ReactDOM.render((
      &lt;Router history={History}&gt;
          &lt;Route path="/" component={App}&gt;
              &lt;IndexRoute component={Index} /&gt;
              &lt;Route path="signIn" component={SignIn} /&gt;
          &lt;/Route&gt;
      &lt;/Router&gt;
  ), document.getElementById('app'));
  </code></pre>
  
  <p><strong>P.S.</strong> Currently I do not handle <code>404</code> on client, server returns <code>404</code> for <code>&lt;my_domain&gt;/signIn</code></p>