I've a note in the guide to check the correctness of the following
section. I have these 2 questions:
1. Should all three headers be always sent?
2. Should $r->no_cache(1) be used for non-2xx responses?
Thanks!
=head1 Cache Control for Regular and Error Modes
To disable the client response caching these HTTP headers should be
used:
Pragma: no-cache
Cache-control: no-cache
Expires: Wed, 21 Mar 2001 00:28:13 GMT
where the I<Expires> field is set to the same date and time as the
original request.
For normally generated response use:
$r->header_out("Pragma","no-cache");
$r->header_out("Cache-control","no-cache");
$r->no_cache(1);
If for some reason you need to use them in Error control code
(i.e. when sending some non-2xx response code) use:
$r->err_header_out("Pragma","no-cache");
$r->err_header_out("Cache-control","no-cache");
$r->no_cache(1);
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