title: Preliminary server check for updated webpage(s) in HTML
body: <p>I am having difficulty finding a successful way to implement an HTTP header that more or less says:</p>
  
  <blockquote>
    <blockquote>
      <blockquote>
        <p>This webpage has been updated so do not cache until after it has gone back to the server&lt;&lt;&lt;</p>
      </blockquote>
    </blockquote>
  </blockquote>
  
  <p>I have looked online and think that the best way to go about this is using the <strong>Last-Modified</strong> header. I am just having trouble with the logic behind doing so.</p>
  
  <p>This should be a helpful tool for multiple people who are constantly updating a website/webpages so their clients who visit regularly do not see the cached version of their site but rather the updated version.</p>
  
  <p>Thanks in advance.</p>
  
  <p>-Justin</p>