Propagate correlation ID when proxying requests to another registry
requested to merge 249-propagate-correlation-id-when-proxying-requests-to-another-registry into master
This MR adds the correlation id as a header when proxying a request to a secondary registry, and enables the registry to re-use the existing correlation id.
left registry (and terminal) = Front facing registry
right registry = Proxied registry
Related to #249 (closed)
Edited by Nicolò Maria Mezzopera