Deployment fails getting the .s4r file from the web

Using 0.5.0. Trying to deploy an example s4 app in a distributed environment. First I build the s4r file, leave it in a web server accessible from my machines, and execute the following, getting an error:

./s4 deploy -s4r=http://<server>/<path>/twitter-adapter.s4r
  -c=cluster2 -appName=twitter-adapter

01:15:52.584 [main] ERROR org.apache.s4.tools.Deploy
  Specified S4R file does not exist in
  /home/jaime/s4/http:/<server>/<path>/twitter-adapter.s4r

Note from Matthieu: Fetching from http works when the s4r file URI is correct in ZooKeeper. Unfortunately that does not seem to work directly when using the Deploy tool