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@@ -36,6 +36,7 @@
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<li><a href="#3.Indexes-caching">Indexes caching</a></li>
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<li><a href="#4.Sessions-directories">Sessions directories</a></li>
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<li><a href="#5.Users-upload-directories">Users upload directories</a></li>
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+ <li><a href="#6.Zlib-compression">Zlib compressed output</a></li>
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</ol>
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<h2><a name="1.Using-XCache"></a>1. Using xCache</h2>
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@@ -103,4 +104,52 @@ Don't have time or resources to optimize your Chamilo installation yourself? Hir
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<a href="http://jigsaw.w3.org/css-validator/">
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<img src="http://jigsaw.w3.org/css-validator/images/vcss-blue" style="margin: 1em; float: right;" alt="Valid CSS" />
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</a>
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+<hr />
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+<h2><a name="#6.Zlib-compression"></a>Zlib compressed output</h2>
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+Although this will not make your server faster, compressing the pages you are sending to the users will definitely make them feel like your website's responses are a lot faster, and thus increase their well-being when using Chamilo.<br /><br />
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+Zlib output compression has to be set at two levels: PHP configuration for PHP pages and Apache for images and CSS.<br /><br />
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+To update the PHP configuration (either in php.ini or in your VirtualHost), use the <a href="http://php.net/manual/en/zlib.configuration.php">zlib.output_compression</a>. If you set this inside your Apache's VirtualHost, you should use the following syntax.
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+<pre>
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+php_value zlib.output_compression 1
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+</pre>
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+<br />
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+Configuring your Apache server to use output compression is a bit trickier. You have to use <a href="http://php.net/manual/en/zlib.configuration.php">the mod_deflate module</a> to do it. Your configuration should look like something like this (please read the corresponding documentation before implementing in production).<br />
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+Easy mode:
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+<pre>
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+AddOutputFilterByType DEFLATE text/html text/plain text/xml
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+</pre> or, for every content type (dangerous) you can put the following inside a location or directory block:<pre>SetOutputFilter DEFLATE</pre>
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+<br />
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+Advanced mode:
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+<pre>
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+<Location />
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+# Insert filter
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+SetOutputFilter DEFLATE
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+
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+# Netscape 4.x has some problems...
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+BrowserMatch ^Mozilla/4 gzip-only-text/html
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+
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+# Netscape 4.06-4.08 have some more problems
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+BrowserMatch ^Mozilla/4\.0[678] no-gzip
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+
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+# MSIE masquerades as Netscape, but it is fine
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+# BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
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+
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+# NOTE: Due to a bug in mod_setenvif up to Apache 2.0.48
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+# the above regex won't work. You can use the following
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+# workaround to get the desired effect:
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+BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html
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+
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+# Don't compress images
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+SetEnvIfNoCase Request_URI \
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+\.(?:gif|jpe?g|png)$ no-gzip dont-vary
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+
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+# Make sure proxies don't deliver the wrong content
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+Header append Vary User-Agent env=!dont-vary
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+</Location>
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+</pre>
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+<hr />
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+<h2>Authors</h2>
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+<ul>
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+<li>Yannick Warnier, Zend Certified PHP Engineer, BeezNest Belgium SPRL, <a href="mailto:ywarnier@beeznest.net">ywarnier@beeznest.net</a></li>
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+</ul>
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</body></html>
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