no-cache headers?

2001-03-20 Thread Stas Bekman 

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 IExpires 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);




_
Stas Bekman  JAm_pH --   Just Another mod_perl Hacker
http://stason.org/   mod_perl Guide  http://perl.apache.org/guide
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RE: no-cache headers?

2001-03-20 Thread Geoffrey Young 



 -Original Message-
 From: Stas Bekman [mailto:[EMAIL PROTECTED]]
 Sent: Tuesday, March 20, 2001 11:44 AM
 To: mod_perl list
 Subject: no-cache headers?
 
 
 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 IExpires 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);

$r-no_cache(1) sets these headers for you - no need to set them yourself.

 
 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);

I don't think this is necessary

  http://archive.covalent.net/perl/dev/2000/09/0042.xml

--Geoff

 
 
 
 
 _
 Stas Bekman  JAm_pH --   Just Another mod_perl Hacker
 http://stason.org/   mod_perl Guide  http://perl.apache.org/guide
 mailto:[EMAIL PROTECTED]   http://apachetoday.com http://logilune.com/
 http://singlesheaven.com http://perl.apache.org http://perlmonth.com/

RE: no-cache headers?

2001-03-20 Thread Stas Bekman 

On Tue, 20 Mar 2001, Geoffrey Young wrote:

  For normally generated response use:
 
$r-header_out("Pragma","no-cache");
$r-header_out("Cache-control","no-cache");
$r-no_cache(1);

 $r-no_cache(1) sets these headers for you - no need to set them yourself.

 
  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);

 I don't think this is necessary

   http://archive.covalent.net/perl/dev/2000/09/0042.xml

In fact it's well covered in here:
http://perl.apache.org/guide/correct_headers.html

Sometimes I myself get lost in all the amount of information the guide
includes... so I've removed this duplication section. Andreas Koenig's doc
is the right one to stick too.

_
Stas Bekman  JAm_pH --   Just Another mod_perl Hacker
http://stason.org/   mod_perl Guide  http://perl.apache.org/guide
mailto:[EMAIL PROTECTED]   http://apachetoday.com http://eXtropia.com/
http://singlesheaven.com http://perl.apache.org http://perlmonth.com/