It is good to know that Oracle HTTP Server (OHS) is an Apache HTTP server (Apache). In particular, OHS is Apache 2.2.22, including critical bug fixes from higher versions of Apache. https://docs.oracle.com/middleware/1213/webtier/HSADM/intro_ohs.htm#HSADM102
* Now it is updated from OHS 12.2.1 to Apache 2.4.
https://docs.oracle.com/middleware/1221/webtier/administer-ohs/whats_new.htm#HSADM1277
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