为什么 Apache HTTP 服务器版本号都是偶数？
Why are Apache HTTP server version numbers all even?
之前的 Apache HTTPD 版本是 2.2。目前的是2.4。下一个将是 2.6。在 their documentation 中，这些版本 有时 称为 2.1/2.2、2.3/2.4 和 2.5/2.6（在“新功能”页面的标题中）。但是我找不到解释为什么跳过了数字，也找不到为什么它们有时 sort-of 成对捆绑...
有人知道吗？
奇数用于开发，稳定版本得到匹配的偶数：2.1，稳定后变为2.2。
这在 Apache release process 开发者文档中有描述：
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.
之前的 Apache HTTPD 版本是 2.2。目前的是2.4。下一个将是 2.6。在 their documentation 中，这些版本 有时 称为 2.1/2.2、2.3/2.4 和 2.5/2.6（在“新功能”页面的标题中）。但是我找不到解释为什么跳过了数字，也找不到为什么它们有时 sort-of 成对捆绑...
有人知道吗？
奇数用于开发，稳定版本得到匹配的偶数：2.1，稳定后变为2.2。
这在 Apache release process 开发者文档中有描述：
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.