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GNU Emacs Manual: 38.12 Importing and Exporting Diary Entries
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(require 'url)
(require 'icalendar)
(defconst dualis-url "https://10.2.2.21/dhbwcalendar/ics")
(defconst dualis-do-not-ask t)
(defun dualis-import ()
(let ((buffer (url-retrieve-synchronously dualis-url)))
(save-excursion
(set-buffer buffer)
(icalendar-import-buffer nil dualis-do-not-ask)
(kill-buffer (current-buffer)))))