Create proxy host without redirection on root, but with custom location

[12ozCode]

Hi, I wanted to create proxy host, which doesn't redirect anywhere when accessed on the root, but has custom locations working.
Some kind of API Gateway.
But currently its mandatory to set some redirection target for root, so even If I don't need it, and only want to work next ones

my.host.com/app1
my.host.com/app2

I still have to set some target for my.host.com.
Is it possible to solve with current version or it is not implemented ?

Also is it possible to rewrite target?
Let say when my.host.com/app1 is accessed then target gets request without app1 part, just like accessed by root.