Question

How do I enable mod_deflate?

Asked by: shannon_adams

As I understand it, there are some important things, performance related, that we need to enable on our web server.  The first is to compress all data.  For this, we need to either use mod_deflate or mod_gzip.  I want to use mod_deflate with the option below:

##Gzip code to compress web pages - this is option 1.  This explicitly lists the extensions to compress
<FilesMatch "\\.(js|css|html|htm|php|xml)$">
SetOutputFilter DEFLATE
</FilesMatch>

Can someone please give me a step-by-step on how to enable and test this?

Running CentOS 5.2
# httpd -v
Server version: Apache/2.2.3
Server built:   Nov 12 2008 10:41:27

/etc/httpd/conf/httpd.conf is attached.

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Asked On
2009-09-09 at 11:37:20ID24719122
Topic

Apache Web Server

Participating Experts
1
Points
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Comments
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Answers

 

by: caterham_wwwPosted on 2009-09-09 at 14:35:22ID: 25295822

The module is loaded according to your httpd.conf but may be the regEx \\. fails. Try to use only one backslash.

How to test - get the firefox extension livehttpheaders and monitor the HTTP headers (content-encoding header) while you're requesting the page and receiving the result (or you can analyze the logs of course since you defined a "deflate_log").

 

by: shannon_adamsPosted on 2009-09-09 at 15:08:54ID: 25296031

Thanks for the response.  Can you tell me in /var/log/httpd/deflate_log what I am looking for to know that it is working correctly?  Also, what exactly am I looking for if I load livehttpheaders extension to know it is working there?

 

by: caterham_wwwPosted on 2009-09-11 at 10:35:13ID: 25311719

> Also, what exactly am I looking for if I load livehttpheaders extension

The response header

Content-Encoding

as mentioned above.

> Can you tell me in /var/log/httpd/deflate_log what I am looking for

You defined input output and ratio to be logged, so you're looking for the values. If input is > than output (and ratio >0), mod_deflate compresses the response.

20120131-EE-VQP-002

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