it's a line-based protocol: write your TCP port number, which port you want to test the connectivity to.
response is POSIX error code resulted by connect(2) and the your service's banner.
git repos
public repos available on these URLs, although user and repo names are not allowed to be enumerated yet:
git://git.uucp.hu/{USER}/{REPO}
http://git.uucp.hu/{USER}/{REPO}