Documentation of gitlab-runner <-> gitlab protocol

Hi,

Is there any documentation of how the gitlab runner communicates with gitlab?
I understand, that gitlab runner polls gitlab via https and reports build status.
But I cannot find a documentation of the (REST) Api.

Thanks!
Nathan

Hi,

Is there any documentation of the protocol gitlab runner uses to communicate with gitlab?
I can find a lot of gitlab documentation, but nothing about this …

Thanks!
Nathan