Perhaps something useful - I do see that the "serveradmin" command says that it runs apache 2.2 even though "httpd -v" says 2.4.23??
httpd -v Server version: Apache/2.4.23 (Unix) Server built: Aug 8 2016 16:31:34 sudo serveradmin fullstatus web web:health = _empty_dictionary web:readWriteSettingsVersion = 1 web:apacheVersion = "2.2" web:servicePortsRestrictionInfo = _empty_array web:startedTime = "2016-12-27 19:08:59 +0000" web:apacheState = "RUNNING" web:statusMessage = "" web:ApacheMode = 2 web:servicePortsAreRestricted = "NO" web:state = "STOPPED" web:setStateVersion = 1
