When posting data to a hosting service over HTTP POST, we construct a

multi-part form data payload, but we do so a bit incorrectly in that

we've left off the trailing boundary.
Most HTTP form-handling implementations are pretty relaxed about their

parsing of HTTP form data and don't seem to mind us leaving this off.

However, GitLab (or some component/configuration of GitLab, as this is

not universal) does have a problem with it and ends up returning a

HTTP 502 Bad Gateway error.
This is easily fixed by just adding the trailing boundary in all

payloads. This fixes GitLab and should help avoid problems down the road

with other services.

Tested with a customer and verified that the addition of this line fixed

their GitLab problem.