title: Can't use React-Router in React Typescript
body: <p>I have a React app that's using Typescript.</p>
  
  <p>React versions <code>"react": "^16.9.0"</code> and React-Router version <code>"react-router-dom": "^5.1.2"</code></p>
  
  <p>My <code>App.tsx</code> file is set up like this:</p>
  
  <pre><code>const App: React.FC = observer(() =&gt; {
  
    return (
      &lt;div className="App"&gt;
        &lt;Router&gt;
          &lt;Route path="/1234"&gt;
            &lt;Home /&gt;
          &lt;/Route&gt;
        &lt;/Router&gt;
      &lt;/div&gt;
    );
  });
  
  export default App;
  </code></pre>
  
  <p>But when I try go to <code>localhost:4000/1234</code>, I get the following error:</p>
  
  <pre><code>Refused to load the image 'http://localhost:4000/favicon.ico' because it violates the following Content Security Policy directive: "default-src 'none'". Note that 'img-src' was not explicitly set, so 'default-src' is used as a fallback.
  
  </code></pre>
  
  <p>Where I should see the <code>&lt;Home /&gt;</code> component instead.</p>
  
  <p>Your help with be greatly appreciated. </p>