Anyone know if there's a way to specify a refresh interval within a webcal:// URL? Seems that when using them it's defaulting to a week.
Since I cannot rely on the users reliably changing the refresh, is there a way to encode this in the URL?
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There is no way built-in the RFC standards, the best proof being that there is a draft to extend RFC5545 here.
5.6. REFRESH-INTERVAL Property
Property Name: REFRESH-INTERVAL [...]
But as this is only a draft it is most likely not supported by any webcalendar.
x-prop was defined and is used by Microsof (and possibly others):
X-PUBLISHED-TTL (see microsoft msdn calendar)
220.127.116.11.1.15 Property: X-PUBLISHED-TTL
Brief Description: Specifies a suggested iCalendar file download frequency for clients and servers with sync capabilities.
however note that this property being custom may be ignored by some of your target calendars