We have to setup a reverse proxy using Apache 2.2 for Oracle Apps R12.2.
Request should go in this way:
Load Balancer(Port: 443)(https) --> Reverse Proxy(Apache)(Port: 443) (https) --> Application Server(Port: 8000) --> Database (Port: 1521)
Reverse Proxy on port 80 is working bu the same is not working on 443
In your reverse proxy, you have to proxypass 443 to your 12.2 DMZ/external tier host and port. Look at the following note for examples.
How to Setup Oracle HTTP Server as a Virtual Host Reverse Proxy (Doc ID 314381.1)