How is WebLogic running without Oracle HTTP Server?

How is WebLogic running without Oracle HTTP Server?

There are two servers, both having Application1 deployed over WebLogic. On the first server, when I start of the application, OHS starts, WebLogic and then finally the application starts off.
Server1:
bash-3.2$  ps -efc | grep httpd.worker | grep -v grep
 user1 9873  9872   TS  59 07:09:44 ?           0:04 /opt/shared/apps/hyperion/Oracle/Middleware/ohs/ohs/bin/httpd.worker -DSSL
 user1 9882  9873   TS  59 07:09:53 ?           0:00 /opt/shared/apps/hyperion/Oracle/Middleware/ohs/ohs/bin/httpd.worker -DSSL
 user1 9883  9873   TS  59 07:09:53 ?           0:10 /opt/shared/apps/hyperion/Oracle/Middleware/ohs/ohs/bin/httpd.worker -DSSL
On Server2, the WebLogic starts up fine and deploys the application correctly. But OHS does not start up.. OHS is configured to listen on port 19000 on both the servers.
I understand that the Application1 runs as a WebLogic managed server, but doesn't WebLogic sit on top of OHS? So how come Application1 is runs fine without OHS starting up?



Note that I am new to Oracle Fusion Middleware and still working on understanding the concepts of how it all fits together. so any guidance will be very much appreciated. Thanks.