% nimble refresh --verbose
Downloading Official package list
     Trying https://github.com/nim-lang/packages/raw/master/packages.json
   Warning: Could not download: location header expected
     Trying http://irclogs.nim-lang.org/packages.json
     Trying http://nim-lang.org/nimble/packages.json
     Error: Refresh failed
        ... Could not download: location header expected