Update custom-server-express example with getServerSideProps (#11035)

* use getServerSideProps

* run Prettier

* update react

* use getStaticProps

* delete query

* Remove data fetching requirements

Co-authored-by: “kosuke_matano” <kosuke_matano@cyberagent.co.jp>
Co-authored-by: Luis Alvarez <luis@zeit.co>

examples/custom-server-express/package.json

@@ -10,7 +10,7 @@
     "cross-env": "^5.2.0",
     "express": "^4.14.0",
     "next": "latest",
-    "react": "^16.7.0",
-    "react-dom": "^16.7.0"
+    "react": "^16.13.0",
+    "react-dom": "^16.13.0"
   }
 }

examples/custom-server-express/pages/index.js

@@ -13,10 +13,5 @@ export default () => (
         <a>b</a>
       </Link>
     </li>
-    <li>
-      <Link href={{ pathname: '/posts', query: { id: '2' } }} as="/posts/2">
-        <a>post #2</a>
-      </Link>
-    </li>
   </ul>
 )

examples/custom-server-express/server.js

@@ -17,10 +17,6 @@ app.prepare().then(() => {
     return app.render(req, res, '/b', req.query)
   })
 
-  server.get('/posts/:id', (req, res) => {
-    return app.render(req, res, '/posts', { id: req.params.id })
-  })
-
   server.all('*', (req, res) => {
     return handle(req, res)
   })