title: why webservers use port 80 for real applications?
body: <p><strong>Just curious</strong>. When developing with Casini development server, one has an infinite number of ports. But, the production servers seem to give a particular importance to <strong>port 80</strong>. </p>
  
  <p>Has that to do with a technical requirement, a convention, or both? I've checked the web but haven't been able to find a clear response so far.</p>
  
  <p>Thanks for helping.   </p>