modify "HOST:x.x.x.x" field only?

 

Is there a method to modify the "HOST.x.x.x" field only? I need to make all requests do this:

 

HOST: site.test.com = HOST: site.test.com:84

 

 

I need to append port 84 in the HOST: field so that a legacy application will process it correctly. I already have the pool members listening on port 84 as is the actual web server instance but it needs to be in the HTTP header/ HOST field as well.

 

 

Any ideas would be very much appreciated.

 

 

Thank you,