Oracle HTTP Server is the web server component for Oracle Fusion Middleware. The server uses the WebLogic Management Framework to provide a simple, consistent and distributed environment for administering Oracle HTTP Server, Oracle WebLogic Server, and the rest of the Fusion Middleware stack. It acts as the HTTP front-end by hosting the static content from within and by using its built-in Oracle WebLogic Server Proxy Plug-In (mod_wl_ohs module) to route dynamic content requests to WebLogic-managed servers.
For information about the topologies you into which you can install Oracle HTTP Server, see Oracle HTTP Server 12c (12.2.1.3.0) Topologies.