Feature Request: load balancing

Instead of specifying a single IP address to forward the request to, it would be great if we could specify a pool of servers. Something like this

 ```
{
     "ip":"",
     "port":"8080",
     "routes":{
         "/Downloads/":[
             "192.168.88.164:8000",     
             "192.168.88.164:8001", 
             "192.168.88.164:8002"
        ]
     }
 }
```