Why can I only "hg clone" over http, but not https, from sourceforge?
$ hg clone http://hg.code.sf.net/p/ruamel-yaml/code
[...]
684 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg clone https://hg.code.sf.net/p/ruamel-yaml/code
http authorization required for https://hg.code.sf.net/p/ruamel-yaml/code
realm: SourceForge User
user: