sessions added

src/App.js

@@ -1,13 +1,27 @@
-import React, { useState } from 'react';
+import React, { useEffect, useState } from 'react';
+import axios from 'axios';
 import { BrowserRouter as Router , Redirect } from 'react-router-dom';
 import NameInput from './components/NameInput';
 
 function App() {
+  useEffect(()=>{
+    axios.post('http://localhost:3000', {
+      credentials: 'include',
+      mode: 'cors'
+    })
+    .then((response)=> response.id!=null ? setRedirect(true): null);
+  })
   const [id, setId] = useState('')
   const [redirect, setRedirect] = useState(false)
   const idCallback = (id)=>{
     setId(id);
-    setRedirect(true);
+    
+    axios.post('http://localhost:3000', {
+      credentials: 'include',
+      mode: 'cors',
+      headers: { "Content-Type": "application/json" },
+    })
+    .then(()=> setRedirect(true))
   }
   return (
     <Router>