This figure illustrates the Oracle HTTP Server directory structrure.
It shows that the ORACLE_HOME contains a top level directory called the Apache. This directory contains the following directories:

• Apache (second level)
• Jserv
• jsp
• modplsql
• Jsdk
• fastcgi
• oradav

The second level Apache directory contains the following directories:

• bin
• cgi-bin
• conf
• fcgi-bin
• htdocs
• icons
• include
• libexec
• logs
• man

The surrounding text contains more information on these directories.