Octoprint plugin that allows your Marlin based 3D printer to create a put request out of an action. So your printer could talk to an API for example.
Install via the bundled Plugin Manager or manually using this URL:
https://github.com/YouMagine/RequestBack/archive/master.zip
Your firmware needs to create actions. More on actions here: http://docs.octoprint.org/en/master/features/action_commands.html#sec-features-action-commands