ohs version information

./httpd -version
Server version: Oracle-HTTP-Server/2.2.15 (Unix)
Server built:   Apr  2 2011 23:51:27
Server label:   APACHE_11.1.1.5.0_LINUX.X64_110325.2001

if above command does not provide Server label than try below file, it had components version information including jdk oam 

find file comps.xml

it should be under /inventory/ContentsXML/


Programatically obtain the variables using the fcgi-bin executable:

http://servername:port/fcgi-bin/echo
http://servername:port/cgi-bin/printenv

If ServerTokens is not set to Prod in httpd.conf, you can also see the version on a page not found page, when requesting an invalid file:

http://servername:port/thispageisnotfound

ls -d $ORACLE_HOME/inventory/Components*/*/* | grep "apache.apache"