mod_rest: Catch and log errors in callback promise chain From the code it looks like it should be possible to reply to an error stanza, but it did not. Turns out I was saved by my local developer mode module which throws errors if an attempt is made to create an errror reply to an error stanza. However nothing collects this error from the promise, so all I got was confusion.

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labels:
summary: Report server uptime in presence
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Introduction
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This module simply responds to a presence probe sent to the server with
a presence staza containing a timestamp from when the server started.

This is imagined as an alternative to the XEP-0012 "Last Activity"
protocol that can seem a bit overloaded.