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Apache HTTPd 2.2 is the latest version of the Apache Software Foundation’s flagship product; it is also the one that httpd developers most recommend that you use. If you are using an older version of the product—particularly if you are using a 1.3 version—it is highly recommended that you upgrade to the 2.2 series.
In this document, I will attempt to give you some idea of why you should upgrade and an understanding of the new functionality in this release that makes it vastly superior to previous releases.