During 0.6.4..0.6.5 upstream reworked the way request about downloading
archive is replied. Before it was json in body, after it is json in
headers handled via so-called "senddata" workhorse mechanism:

    https://gitlab.com/gitlab-org/gitlab-workhorse/commit/153527fb

Adjust our patch accordingly about requesting whether it is ok to
download from repository or not.