[Koha] Apache bandwidth tuning in default config

[Tomás]

I've been playing recently with some firefox extensions for web developers:

FireBug: https://addons.mozilla.org/es-ES/firefox/addon/1843
PageSpeed: http://code.google.com/intl/es-ES/speed/page-speed/index.html
YSlow: http://developer.yahoo.com/yslow/

and found that enabling certain options in the koha's apache VirtualHosts
configuration would improve a lot koha's performance in bandwidth use. Only
the opac startup page bandwidht usage goes from 368.5K  to 118.3K.


Enable http compression using mod_deflate
---------------------------------------------------------------

Document this command for enabling this in Debian/Ubuntu

# a2enmod deflate

and add this lines to koha-http.conf in both VirtualHost definitions

   SetOutputFilter DEFLATE
   SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip

I specify not to apply useless compression to compresed images. Further
options could be used. See
http://httpd.apache.org/docs/2.0/mod/mod_deflate.html


Enable better caching features by setting explicit expiration far in the
future for static content using mod_deflate
----------------------------------------------------------------------------------------------------------------------------------------------------------------

Document this command for enabling this in Debian/Ubuntu

# a2enmod expires

and add this lines to koha-http.conf in both VirtualHost definitions

   ExpiresActive On
   ExpiresDefault "modification plus 1 year"

as mod_expires only applies to files in the filesystem it is safe to rely on
modification date. This could be fine-tuned, for example on a per filetype
basis (see http://httpd.apache.org/docs/2.0/mod/mod_expires.html).

-----

PageSpeed in particular offers some recommendation on image sizes and
provides an optimal image file for substitution. This could be analised.

To+.

-- 
Aparición con vida de Jorge Julio López.
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