[ASTERISK-179] res_calendar_icalendar: Calendar download warnings from proxy site

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On proliant, calendar downloads are pulled through the internal proxy service, which only downloads the origin file once every so often and then caches it.

For some reason, res_calendar_icalendar doesn't seem to like this PHP proxy script - not sure if this is an issue on the Asterisk side or the PHP side (maybe both). This has been going on for several months. Downloads work much of the time, so this is only a nuisance rather than a critical issue, but this happens every so often. The failed requests do not appear in the Apache logs.

[2026-02-27 19:09:20.000] WARNING[2631]: res_calendar_icalendar.c:151 fetch_icalendar: Unable to retrieve iCalendar 'calendar1' from 'http://redacted.example.com/calendar.ics': 408 Request Timeout
[2026-02-27 19:09:20.000] WARNING[2631]: res_calendar_icalendar.c:518 ical_load_calendar: Unable to parse iCalendar 'calendar1'
[2026-02-27 19:09:20.000] WARNING[2630]: res_calendar_icalendar.c:151 fetch_icalendar: Unable to retrieve iCalendar 'calendar2' from 'http://redacted.example.com/calendar2.ics': 408 Request Timeout
[2026-02-27 19:09:20.000] WARNING[2630]: res_calendar_icalendar.c:518 ical_load_calendar: Unable to parse iCalendar 'calendar2'
[2026-02-27 19:09:24.011] WARNING[2632]: res_calendar_icalendar.c:151 fetch_icalendar: Unable to retrieve iCalendar 'calendar3' from 'http://redacted.example.com/calendar3.ics': 408 Request Timeout
[2026-02-27 19:09:24.012] WARNING[2632]: res_calendar_icalendar.c:518 ical_load_calendar: Unable to parse iCalendar 'calendar3'
[2026-02-27 19:29:20.000] WARNING[2631]: res_calendar_icalendar.c:151 fetch_icalendar: Unable to retrieve iCalendar 'calendar1' from 'http://redacted.example.com/calendar.ics': 408 Request Timeout
[2026-02-27 19:29:20.000] WARNING[2631]: res_calendar_icalendar.c:518 ical_load_calendar: Unable to parse iCalendar 'calendar1'
[2026-02-27 19:29:20.000] WARNING[2630]: res_calendar_icalendar.c:151 fetch_icalendar: Unable to retrieve iCalendar 'calendar2' from 'http://redacted.example.com/calendar2.ics': 408 Request Timeout
[2026-02-27 19:29:20.000] WARNING[2630]: res_calendar_icalendar.c:518 ical_load_calendar: Unable to parse iCalendar 'calendar2'
[2026-02-27 19:29:24.012] WARNING[2632]: res_calendar_icalendar.c:151 fetch_icalendar: Unable to retrieve iCalendar 'calendar3' from 'http://redacted.example.com/calendar3.ics': 408 Request Timeout

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