'Why are Apache HTTP server version numbers all even?
The previous Apache HTTPD version was 2.2. The current one is 2.4. The next one will be 2.6. In their documentation these versions are sometimes called 2.1/2.2, 2.3/2.4 and 2.5/2.6 (in the titles of "New Features" pages). But I cannot find an explanation why there are numbers skipped, nor why they are sometimes sort-of bundled up in pairs...
Does anyone know?
Solution 1:[1]
The odd numbers are for development, and the stable releases get the matching even number: 2.1, once stable, becomes 2.2.
This is described in the Apache release process developer documentation:
With the introduction of Apache 2.1, the Apache httpd project has adopted an odd-even release strategy, where development happens with alpha and beta releases assigned an odd-numbered minor version, and its general availability (stable) release is designed with the subsequent even-numbered minor version. E.g. 2.1.0-alpha through 2.1.6-alpha were followed by 2.1.7-beta through 2.1.9 beta, and cumulated in the 2.2.0 general availability release.
Sources
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Source: Stack Overflow
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