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"500 Some specific error message",
This was discussed a lot when we initially designed PSGI and it was intentionally left out. (Python's WSGI supports this while Ruby's Rack doesn't)
http://tozt.net/status-message.txt for reference from IRC chat.
Also https://groups.google.com/d/topic/rack-devel/KfNmEQpOZI0/discussion from Ruby's Rack point of view.
14:57 miyagawa: it might be reasonable to make a breaking change on the server side for PSGI 1.2
14:59 miyagawa: like - the server appends the reason text only if the status code is only numeric
14:59 miyagawa: that way apps can check if PSGI is 1.2 (and maybe introduce new psgi.* variable to make sure) and in that case it *could* return "$code $reason"
14:59 miyagawa: apps can continue returning $code only, and it will work both 1.1 and 1.2
I had actually tried it with dualvar() but got caught up on Lint. Hadn't considered simply disabling Lint.
I'd really love it if this feature made it into the next version of PSGI. So far I've worked around it by setting an "X-" response header instead, but somebody else mentioned being frustrated by this limitation to me recently, so I decided it needed reporting as an issue.
Hopefully topical bikeshedding, but I think if this were to be
implemented making it either be an integer on a two-element ArrayRef
would make more sense. I.e. either:
[ 500, "Some specific error message" ]
It would make it easier to e.g. check that the status code is valid on
the webserver layer without having to parse it out of a string.