title: Http request and response headers headers
body: <p>I want to know the difference between request and response headers based on these factors - </p>
  
  <ol>
  <li>between Expires, Date, Age, and If-Modified</li>
  <li>Do Not Track</li>
  <li>Cache-Control</li>
  <li>Transfer-Encoding</li>
  <li>ETag</li>
  <li>X-Frame-Options</li>
  </ol>
  
  <p>I  have referred to these docs <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers" rel="nofollow noreferrer">https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers</a> but didn't find any proper details</p>