if you're using expires, then you're doing the right thing... but if the page still shows up when you click back, this is the fault of your ISP probably having a cache that doesn't respect HTML headers..

and what's with the refresh?? of course you'll see the page when you refresh it.. or do you want everyone to view it only once in their lifetime??

Maybe the problem is with your code, that's how it should be:

print $query->header(-type=>'text/html',
                             -expires=>'-1d');
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Update: Re-read it, the expires is in the header not in the starthtml

Unfortunately not all browsers respect the expires directive, you might try the following to add the no cache pragma to the headers when you output the page you want to expire:

tachyon

# if using CGI.pm to generate output try:

print $query->header( -type          => 'text/html',
                      -expires       => '-1d',
                      -Pragma        => 'no-cache',
                      -Cache-control => 'no-cache');

# if directly outputing try:

print <<END_OF_HEADER;
Status: 200 OK
Expires: now
Pragma: no-cache
Cache-control: no-cache
Content-type: text/html

END_OF_HEADER
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This should generate a page expired message when you try to go back. </code>