Get raw file from repository not works for lfs files

Summary

Getting raw file of a lfs file not works, return reference of the file, eg :

version https://git-lfs.github.com/spec/v1
oid sha256:d49b4164afc9a69cd2db26c64748a3b5dff5de9da96d92a9479a94ffa5f38688
size 33296

Steps to reproduce

As decribed into https://docs.gitlab.com/ee/api/repository_files.html#get-raw-file-from-repository

GET https://XXX/api/v4/projects/XXX/repository/files/myLfsFile/raw?private_token=XXX&ref=master