Gist feature sends wrong requests

[Zabuzard]

Issue

Our recent gist feature (#491) seems to send incorrect requests to the API, which then fail:

This happens many times per day, likely on (almost?) each help message.

Action

Unfortunately, the log is not too helpful. Proposal:

• try to reproduce it locally, it happens super often per day after all, so maybe it is easy to reproduce by trying out a bit
• if not, we can extend the logging (add the request, add details to find the message that triggered it) - deploy the improved logging and then check again

we should do latter anyways to improve handling future bugs with the feature.

[Zabuzard]

(visibility @SquidXTV )