Re: Feature Request: Check if commit is existent via http-protocol

1) You can request a specific list of commits of a branch by index (e.g. 
"1 to 30 <sha1 of branch>" would send the first 30 commits from the 
server to the client of the branch "master"

If your Git server supports it, a partial solution is to do a partial
clone, e.g.:

  git clone --filter=tree:0 --bare \
    https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux

And you can add --depth=10 if you want the last 10 commits in that
branch too:

  git clone --filter=tree:0 --bare --depth=10 \
    https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux

This creates a partial clone with no local trees or blobs. If you're
just doing ancestry checks with "git merge-base", that should be
sufficient. (If you're doing anything else, trees and blobs will be
downloaded as Git needs them.)