Cache Control

eg1)

HTTP/1.1 200 OK
Date: Mon, 6 Aug 2001 12:12:12 PST
Server: Apache/1.3.16 (Unix)
Cache-Control: max-age=600, must-revalidate (or no-cache)
Expires: Mon, 6 Aug 2001 1:12:12 PST
ETag: "3e86-410-3596fbbc"
Content-Length: 1040
Content-Type: text/html

eg2) Using CGI:

#!/usr/bin/local/perl
print "Content-Type: text/html\n";
print "Expires: Mon, 6 Aug 2001 1:12:12 PST\n";
print "\n"
### the content body follows...
...
print "Cache-Control: max-age=600\n";
...

eg3) Using PHP3:

<?php
  Header("Cache-Control: must-revalidate");
  
  $offset = 60 * 60 * 24 * 3;
  $ExpireString = "Expires: " . gmdate("D, d M Y H:i:s", time() + $offset) . " PST";
  Header($ExpireString);
?>

eg4) Using ASP:

<% Response.Expires=1440 %>

<% Response.ExpiresAbsolute=#Aug 6, 2001 13:12:12 PST# %>

<% Response.CacheControl="public" %>

--EOF--