title: Why I can't see real request headers here
body: <p><a href="https://i.stack.imgur.com/3jRtt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3jRtt.png" alt="enter image description here"></a></p>
  
  <p>Look at Request headers it says <code>Provisional headers are shown</code>, I read somewhere on SO   "The message is there because the request to retrieve that resource was never made"</p>
  
  <p>I am getting 304 Response from the server that mean surely a request has been send to server ,</p>
  
  <p>So why i can't see real request headers ? </p>