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Avoiding Proxy Caching

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  Avoiding Proxy Caching j <mung_me@att.net> - 2011-07-26 11:35 -0400
    Re: Avoiding Proxy Caching Michael Fesser <netizen@gmx.de> - 2011-07-26 19:58 +0200
      Re: Avoiding Proxy Caching j <mung_me@att.net> - 2011-07-26 15:02 -0400
    Re: Avoiding Proxy Caching "Álvaro G. Vicario" <alvaro.NOSPAMTHANX@demogracia.com.invalid> - 2011-07-27 08:40 +0200
      Re: Avoiding Proxy Caching Michael Fesser <netizen@gmx.de> - 2011-07-28 15:19 +0200

#2648 — Avoiding Proxy Caching

   I'm having trouble with a proxy server caching pages. Is there a 
header or something that I can send to alleviate this problem?

What I have is an htaccess rewrite rule

RewriteRule ^(.*/protected_directory/.*)	/pass_check_script.php?path=/$1

  that sends all requests for a directory to a php script that does some 
password checking and then reads the file and prints a Content-type and 
then prints the file contents. A proxy server has cached the results and 
avoids the pass check.

   I was thinking of sending something in the header, or perhaps just 
amending some random string to the html. I know proxy servers ignore 
html type no-cache settings.

  Jeff

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#2649

.oO(j)

>   I'm having trouble with a proxy server caching pages. Is there a 
>header or something that I can send to alleviate this problem?

Caching Tutorial for Web Authors and Webmasters
http://www.mnot.net/cache_docs/

Micha

-- 
http://mfesser.de/blickwinkel

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#2650

On 7/26/2011 1:58 PM, Michael Fesser wrote:
> .oO(j)
>
>>    I'm having trouble with a proxy server caching pages. Is there a
>> header or something that I can send to alleviate this problem?
>
> Caching Tutorial for Web Authors and Webmasters
> http://www.mnot.net/cache_docs/
>
> Micha
>
   Thanks! Looks like: 	header('Cache-Control: no-store');	

   Jeff

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#2655

El 26/07/2011 17:35, j escribió/wrote:
> I'm having trouble with a proxy server caching pages. Is there a header
> or something that I can send to alleviate this problem?
>
> What I have is an htaccess rewrite rule
>
> RewriteRule ^(.*/protected_directory/.*) /pass_check_script.php?path=/$1
>
> that sends all requests for a directory to a php script that does some
> password checking and then reads the file and prints a Content-type and
> then prints the file contents. A proxy server has cached the results and
> avoids the pass check.
>
> I was thinking of sending something in the header, or perhaps just
> amending some random string to the html. I know proxy servers ignore
> html type no-cache settings.

I normally use something like this:

header('Expires: ' . gmdate('D, d M Y H:i:s', time()-86400*365*10) . ' 
GMT');
header('Cache-Control: no-store, no-cache, must-revalidate, 
post-check=0, pre-check=0');
header('Pragma: no-cache');

If I recall correctly it's the "Pragma" header the one that's designed 
for proxies but I'd say there's no need to cache the password checking 
page not even in browsers.


-- 
-- http://alvaro.es - Álvaro G. Vicario - Burgos, Spain
-- Mi sitio sobre programación web: http://borrame.com
-- Mi web de humor satinado: http://www.demogracia.com
--

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#2667

.oO(Álvaro G. Vicario)

>I normally use something like this:
>
>header('Expires: ' . gmdate('D, d M Y H:i:s', time()-86400*365*10) . ' 
>GMT');
>header('Cache-Control: no-store, no-cache, must-revalidate, 
>post-check=0, pre-check=0');
>header('Pragma: no-cache');
>
>If I recall correctly it's the "Pragma" header the one that's designed 
>for proxies but I'd say there's no need to cache the password checking 
>page not even in browsers.

The 'Pragma' header was defined as a request header. It were broken
browsers like old IE that turned it into a response header, but such a
meaning is not specified.

Micha

-- 
http://mfesser.de/blickwinkel

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