See for details.

nuster listens on port 8080 and accepts HTTP requests.Requests start with /_kv/ go to backend , you can make POST/GET/DELETE requests to /_kv/any_key to set/get/delete K/V object.Other requests go to backend , and will be passed to servers s1 or s2. Among those requests, /img/* will be cached for 1 day and will be cached for 30 seconds.