Re: Problem caching with Apache 2.2 mod_proxy

--- In [email protected], "Dr. Frank Hoffmann" <fh@...>
wrote:
>
> FYI: The code snippet refers to a former Apacher version:
> http://httpd.apache.org/docs/1.3/mod/mod_proxy.html
> PS:
> If you have got the mod_proxy directive successfully tested for Apache
2.2
> please send it to the forum; I will extend the "howto" document.
>

Our configuration (apache 2.2.3):

/etc/apache2/mods-enabled/proxy.conf:

<IfModule mod_proxy.c>
   ProxyRequests Off
   <Proxy *>
      AddDefaultCharset off
      Order deny,allow
      Deny from all
      ProxyFtpDirCharset UTF-8
    </Proxy>
   ProxyVia On
</IfModule>


/etc/apache2/mods-enabled/disk_cache.conf:

<IfModule mod_disk_cache.c>
   CacheRoot /var/cache/apache2/mod_disk_cache
   CacheDirLevels 5
   CacheDirLength 3
</IfModule>


/etc/apache2/sites-enabled/httpd-mySite.conf:

<Proxy *>
   Order allow,deny
   Allow from all
</Proxy>

<VirtualHost *>
   ServerName      www.hermann-husen.de

   RewriteEngine   On
   RewriteRule     ...

   CacheEnable          disk /
   CacheRoot            /path-to-MySite/proxycache
   CacheDirLevels       2
   CacheDirLength       1
   CacheIgnoreNoLastMod On
   CacheDefaultExpire   3600
</VirtualHost>

cache_config (DTML-Method):

<dtml-if "REQUEST.get('preview','')=='preview' or
(getObjProperty('attr_cacheable', REQUEST)==0)"
    ><dtml-call "RESPONSE.setHeader('Expires', '-1')"
    ><dtml-call "RESPONSE.setHeader('Cache-Control', 'no-cache')"
    ><dtml-call "RESPONSE.setHeader('Pragma', 'no-cache')"
><dtml-else><dtml-call "RESPONSE.setHeader('Expires',
_.DateTime(_.DateTime().timeTime() +  86400).toZone('GMT').rfc822())"
    ><dtml-call "RESPONSE.setHeader('Last-Modified',
bobobase_modification_time().toZone('GMT').rfc822())"
    ><dtml-call "RESPONSE.setHeader('If-Modified-Since',
bobobase_modification_time().toZone('GMT').rfc822())"
    ><dtml-call "RESPONSE.setHeader('Cache-Control', 'proxy-revalidate')"
></dtml-if>

Hint: Be sure, that RESPONSE.setHeader is working (you may want to
explicitly check via

wget -S http://yoursite.xx

I had some problems to get the Headers working. HTML output must not
have been occured (even white space ...) prior to RESPONSE.setHeader.
Otherwise RESPONSE.setHeader is beeing ignored (my experience).

Kind regards,

Hermann Husen