items tagged with apache

This module controls the setting of the Expires HTTP header and the max-age directive of the Cache-Control HTTP header in server responses. The expiration date can set to be relative to either the time the source file was last modified, or to the time of the client access.

These HTTP headers are an instruction to the client about the document's validity and persistence. If cached, the document may be fetched from the cache rather than from the source until this time has passed. After that, the cache copy is considered "expired" and invalid, and a new copy must be obtained from the source.

How to activate mod_expires.so
# vi /etc/apache2/conf.d/mod_expires.conf

config is rough right now, but it is better than nothing,put the following in the file

LoadModule evasive20_module     /usr/lib/apache2/mod_expires.so
<IfModule mod_expires.c>
 ExpiresActive On

 ExpiresDefault "access plus 1 month"
 #ExpiresByType text/html "access plus 1 month 15 days 2 hours"
 #ExpiresByType image/gif "modification plus 1 month"
 #ExpiresByType image/png "modification plus 1 month"
 #ExpiresByType image/jpg "modification plus 1 month"
 #ExpiresByType text/css "access plus 1 month 15 days 2 hours"
 #ExpiresByType text/javascript "access plus 1 month 15 days 2 hours"
</IfModule>

You can also set the expire header by type, but it wa snot working in my case, that is why I use the ExpiresDefault directive

• Apache mod_expires references 

• DOSHashTableSize: is the size of the table of URL and IP combined. The greater this setting, the more memory is required for the look up table, but also the faster the look ups are processed. This option will automatically round up to the nearest prime number.
• DOSPageCount: is the number of same page requests from the same IP during an interval that will cause that IP to be added to the block list.
• DOSSiteCount: is the number of pages requested of a site by the same IP during an interval which will cause the IP to be added to the block list.
• DOSPageInterval:  Interval for the 'DOSPageCount' threshold in second intervals.
• DOSSiteInterval:Interval for the 'DOSSiteCount' threshold in second intervals.
• DOSBlockingPeriod: is the time the IP is blacked (in seconds
• DOSEmailNotify: can be used to notify by sending an email everytime an IP is blocked
• DOSSystemCommand: is the command used to execute a command when an IP is blocked. It can be used to add a block the user from a firewall or router.
• DOSWhiteList: can be used to whitelist IPs such as 127.0.0.1