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If you provide your own custom generated ICS file hosted at a URL, it’s nice to be able to give Google Calendar users an easy way to subscribe to that feed.

The format is https://www.google.com/calendar/render?cid=webcal:// followed by your URL. For example: https://www.google.com/calendar/render?cid=webcal://pretalx.com/pycon-au-2020/schedule/export/schedule.ics. This drops the user into the Google Calendar interface with a prompt for them to confirm their subscription.

I believe this only works if you are serving your ICS feed over HTTPS.

Via til.simonwillison.net.

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