1 Node/ Webcache Port 80/ Apps on Port 7778 and 8080

Question

I have a machine with 3 aliases.
Is it possible to bind multiple ports to webcache running on port 80 and depending on alias have it routed to the correct application and port?
What I want is someone that enters http://app1 to go to port 7778 and http://app2 to go to port 8080.
app1 and app2 both resolve to the same IP address.
I keep getting "Another site with same exists" when trying to set this up.
Mike
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Answer 1

Got It.
You need to connect to the webcache admin port on 9400 rather than through the EM Application Server management port on 1156.
Once you get there on the left hand side under "Origin Servers, Sites and Load Balancing"
Click on "Site definintions":
Click on "Add Sites":
For "Host Name" Enter app1
For "Port" Enter 80
Click on "Submit"
Repeat the steps above for each application. I entered each app twice once as app1.us.oracle.com and then simply as app1
Once all the application "Sites" are entered click on "Site to Server Mapping"
Select each site you previously entered and click on "Edit Selected"
In the pop-up select "Select from Site Definitions"
Using the drop down box choose the Application/Site you want to map
Scroll down further in the pop-up to "Select Application Web Servers"
Choose the host and port you want associatted with this application/Site
Then click Submit