Get Reference

Returns a single reference from your Git database. The `:ref` in the URL must be formatted as `heads/` for branches and `tags/` for tags. If the `:ref` doesn't match an existing ref, a `404` is returned. **Note:** You need to explicitly [request a pull request](https://docs.github.com/[email protected]/rest/pulls/pulls#get-a-pull-request) to trigger a test merge commit, which checks the mergeability of pull requests. For more information, see "[Checking mergeabilit...