Google calendar supports subscribing to ical files, where it will occasionally poll them for updates. This can either by selecting "Add Calendar > From URL" in Settings and giving a link to an ical file with protocols http://, https://, or webcal://, or by visiting the URL https://calendar.google.com/calendar/r?cid=webcal://«link». What is the longest URL that can be subscribed to?
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What is the longest URL I can subscribe to in Google Calendar?
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