HTTP project import fails depending on POM URL patterns

Commons MATH now uses Git.
Does not appear to be possible to use Continuum to build it.

Tried the following URLs:

https://git-wip-us.apache.org/repos/asf/commons-math
=> Unknown error trying to build POM.

https://git-wip-us.apache.org/repos/asf?p=commons-math.git
=> POM file does not exist. Either the POM you specified or one of its modules does not exist.

What is the correct incantation for Git projects?
If this is documented anywhere I could not find it.