I tried with "," (no spaces, any other separator is not working) and during trying loading any https website I get page not found error after 0s. 3. I knew a bit more services: "http-https.ihave2proxy.i2p,cheezyproxy.i2p,http.i2p,false.i2p". How to test: if some outproxy is not working (check inr.i2p stats to be sure) then clearnet (http) webpage fail to load and clicking refresh button causes to select different outproxy and the page loads after a few seconds.