which seems to suggest maybe the problem is with HTTP::Headers.
Doubtful. To me, it seems the mistake is in the call to Catalyst::Request::Upload. It assumes that the call to $headers->content_type returns one value (or another odd amount) when called in list context. But that assumption is false; it may return an even number of values as well.

It looks to be that something like 

    type => ($headers->content_type)[0],

[download]
is an improvement.

In reply to Re^2: Catalyst::Request::Upload inside-out-object weirdness by JavaFan
in thread Catalyst::Request::Upload inside-out-object weirdness by andye

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