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What’s new in Apache HTTP Server 2.4?

apache http
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New features in Apache HTTP Server 2.4.x

Apache 2.4.1 was released in Feb 2012 with much great enhancement and new features. The latest version as I write is 2.4.10 released in July 2014. 

In this article, I will talk about some of the significant enhancement, new features included in Apache 2.4 version.

Enhancement

KeepAliveTimeout: It’s possible to specify KeepAliveTimeout in milliseconds with this version. To do so, just add KeepAliveTimeout directive in httpd.conf file.

Ex:

KeepAliveTimeout 5
#Obviously you have to change this value from 5 to something you wish.

Memory Usage: Apache 2.4 claims to use less memory than 2.2.x

Event MPM: Event MPM (Multi-Processing Module) is now fully supported. In an earlier version, it was experimental.

mod_ssl: support OCSP stapling, can share SSL session data between servers through Memcached.

mod_proxy: Location and LocationMatch block in ProxyPass directive offer the significant performance advantage.

New Modules

mod_heartmonitor, mod_lbmethod_heartbeat: This allows mod_proxy_balancer to check the number of active connections on the backend server and perform load balancing.

mod_auth_form: This will enable you to use HTML login form to restrict access. This module has a dependency on mod_session, and these make use of HTTP cookies.

mod_allowmethods: Now you can restrict HTTP methods in your Apache instance with the simple configuration.

<Location /> 
AllowMethods GET HEAD
</Location>

mod_ratelimit: if you are running a web server on low bandwidth or just want to limit the bandwidth, this module is for you. This can restrict client bandwidth to your configured location in httpd.conf file.

Ex: –

<Location /downloads> 
SetOutputFilter RATE_LIMIT 
SetEnv rate-limit 400
</Location>

Note – rate-limit is in KiB/s

mod_data: This module converts response body into an RFC2397 data URL. Data URL is useful when you want to reduce the number of connections while loading page/application. This can also be included in PHP languages.

I believe above are significant changes in Apache 2.4. You may also refer the official Apache 2.4 page for complete details.

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