Using Perlbal headers to communicate the paths of a file wasn't a very smart idea of mine, since Perlbal will interpret them if it happens to be in front of the mogrest server. NOTE we still want to avoid mogrest to server the files itself if we can, so mogrest in itself supports x-reproxy protocol.
…Plack. Some stuff was updated, but these parts were missed leading to broken/ quirky behavior when building.
This is a breaking change