Tell us what’s happening:
I can’t find all correct answers. Help.

Your code so far


  var userName=document.getElementById('name').value;
  // Add your code below this line
const xhr = new XMLHttpRequest();'POST',url,true);
xhr.setRequestHeader('Content-type', 'application/json;charset=UTF-8'

xhr.onreadystatechange = () => {
if(xhr.readyState === 4 && xhr.status == 201){
let serverResponse = JSON.parse(xhr.response)
document.getElementsByClassName('message')[0].textContent = serverResponse.userName + serverResponse.suffix
let body = JSON.stringify({userName: userName,suffix: 'Loves Cat'});
  // Add your code above this line
body {
text-align: center;
font-family: "Helvetica", sans-serif;
h1 {
font-size: 2em;
font-weight: bold;
.box {
border-radius: 5px;
background-color: #eee;
padding: 20px 5px;
button {
color: white;
background-color: #4791d0;
border-radius: 5px;
border: 1px solid #4791d0;
padding: 5px 10px 8px 10px;
button:hover {
background-color: #0F5897;
border: 1px solid #0F5897;
<h1>Cat Friends</h1> 
<p class="message box">
Reply from Server will be here
<label for="name">Your name:
<input type="text" id="name"/>
<button id="sendMessage">
Send Message

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36.

Challenge: Post Data with the JavaScript XMLHttpRequest Method

Link to the challenge: