Installing and Configuring Oracle Web Tier
https://www.oracle.com/webfolder/technetwork/tutorials/obe/fmw/web_cache/11g/r1/install_web_tier/install_web_tier.htm
WebOracle Web Tier contains two main components: Oracle HTTP Server and Oracle Web Cache. Oracle Process Manager and Notification Server (OPMN) is also installed by default. Together, these products are responsible for managing incoming HTTP requests, caching web messages, and sending XML and HTML back to the client.
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