imap: invalid header in response while in http auth state

I'm using imapproxy and trying to switch to nginx. courier is
listening on port 143.

mail {
auth_http localhost:143;
proxy on;
server {
listen 144;
protocol imap;
}
}

I get:

auth http server 127.0.0.1:143 sent invalid header in response while
in http auth state, client: 127.0.0.1, server: 0.0.0.0:144

Does anyone know what's wrong?

- Grant

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