Speaking of unfriendly, I learned recently that unlike S3 buckets, CodeCommit repository URLs are/were not globally unique. That is, something like:

    git clone https://git-codecommit.us-east-2.amazonaws.com/v1/repos/foobar

clones a repository named "foobar" in the namespace of the currently logged-in user. So it can give you completely different results with different credentials.