Calendar Fetch Error

[WallysWellies]

My Outlook calendar is no longer working, displaying an error for the last several days. I’m using the default calendar module.

I think this is some stupid Microsoft issue but perhaps someone has the knowledge to confirm and perhaps even suggest a fix.

This shows in the log (this is a test calendar I setup - the URL is real):

[2025-08-24 21:38:11.500] [ERROR] Calendar Error. Could not fetch calendar:  https://outlook.live.com/owa/calendar/00000000-0000-0000-0000-000000000000/8e3c6cdd-2ee7-43e3-b963-6b7e3efa6d3e/cid-5751C32C44CE49E6/calendar.ics Error: Internal Server Error
at NodeHelper.checkFetchStatus (/home/user/MagicMirror/js/node_helper.js:102:9)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)

I’ve poked around and found that I cannot wget that URL from my pi as it throws a 302 error and doesn’t properly redirect. However if I add my user agent string from my Windows laptop it does work:

wget -U 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36 Edg/139.0.0.0' https://outlook.live.com/owa/calendar/00000000-0000-0000-0000-000000000000/8e3c6cdd-2ee7-43e3-b963-6b7e3efa6d3e/cid-5751C32C44CE49E6/calendar.ics

What have Microsoft done now?

[sdetweil]

@WallysWellies in the next release (Oct 1), there is a new field in the top part of the config.js

userAgent:"......"

[sdetweil]

@WallysWellies they might be rejecting our user agent string

you could try to put your instead

edit

modules/default/calendar/calendarfecher.js

we have an issue on being able to configure the useragent string

[WallysWellies]

@sdetweil Replacing the user agent string resolved the issue immediately - thank you.

[sdetweil]

@WallysWellies thanks for the feedback
I reopened the issue

[sdetweil]

@WallysWellies in the next release (Oct 1), there is a new field in the top part of the config.js

userAgent:"......"

[WallysWellies]

@sdetweil thanks for the heads up. I’ll make sure to use the new supported method next release.

Awesome support as always!

[mdbyers]

@WallysWellies

What string did you use as a replacement? I tried replacing the header directly in calendarfetcher but same error.

[sdetweil]

@mdbyers he used this value from post before, -U parm