Apache HTTP Server（简称Apache）是Apache软件基金会的一个开放源码的网页服务器，可以在大多数电脑操作系统中运行，由于其跨平台和安全性被广泛使 用，是最流行的Web服务器端软件之一。它快速、可靠并且可通过简单的API扩充，将Perl／Python等解释器编译到服务器中。下载：http://httpd.apache.org/download.cgi

Apache 2.3 offers numerous enhancements, improvements, and performance
boosts over the 2.2 codebase.

更新：http://httpd.apache.org/docs/trunk/new_features_2_4.html
ChangeLog: http://www.apache.org/dist/httpd/CHANGES_2.3.6

注意：
This release includes the Apache Portable Runtime (APR) version 1.4.2
and APR-Util version 1.3.9 in a separate -deps tarball.  The APR libraries
must be upgraded for all features of httpd to operate correctly.

This release builds on and extends the Apache 2.2 API.  Modules written
for Apache 2.2 will need to be recompiled in order to run with Apache
2.3, and require minimal or no source code changes.