HTTP Server Error - Expected 207 ... got 200

[AtomPlayed]

Hey,

I have davx5 (from google play) installed on 3 different samsung phones, all accessing the same shared calendar. It's been working great for months, then all the sudden tonight all 3 started getting a push notification with the error 'HTTP server error - Expected 207 Multi-Status, got 200'. All of the phones stopped syncing completely after this started popping up.

We also access this calendar via Thunderbird on PC and there are no issues there - we can edit and sync the calendar without fail.
One of the people were updating some calendar events around the time this started, but we tried deleting and recreating anything that they touched and it hasn't been able to resolve the issue.

If I'm reading the debug log correctly, it seems to point to some type of time code error, but I'm not experienced enough to understand what it's getting at.

HTTP REQUEST
Request{method=REPORT, url=https://redact/rpc/calendars/redact/calendar:f274a32b-f983-94c9-9942-2b8d62faaf97/, headers=[Depth:1, User-Agent:DAVx5/4.2.3.4-gplay (2022/09/20; dav4jvm; okhttp/4.10.0) Android/12, Accept-Language:en-US, en;q=0.7, *;q=0.5]}

HTTP RESPONSE
Response{protocol=http/1.1, code=200, message=, url=https://redact:2080/rpc/calendars/redact/calendar:f274a32b-f983-94c9-9942-2b8d62faaf97/}

<title>Horde :: Fatal Error</title>

A fatal error has occurred

56021006T180000 is not a valid \DateTime or Date string

Details have been logged for the administrator.

Here is the logcat it produced. For some reason, pastebin keeps pulling down the debug-log, even after heavily redacting it. If it's needed I can post it as well.

logcat.txt

[rfc2822]

Hi,

It's a Horde problem. When we send a REPORT to the server, it must reply with 207 and XML, but instead it sent "200 Horde Fatal Error" without an actual response.

Maybe there's some more info in the Horde logs. You'll have to debug Horde in any case.

[AtomPlayed]

I appreciate the quick initial response. I found the horde log in my cpanel and I have ~200 lines of this, all coinciding with when a davx5 client tries to synchronize.
2022-09-29T21:47:46-04:00 EMERG: HORDE 56021006T180000 is not a valid \DateTime or Date string [pid 2681004 on line 184 of "/usr/local/cpanel/3rdparty/php/74/lib/php/Sabre/VObject/Property/DateTime.php"]

I know this is probably out of the scope of davx5, but I'm not exactly sure what may have caused this all the sudden. Is it potentially a problem with php, like my cpanel did an update or something?

[rfc2822]

DAVx5 only requests a certain time range of events. Maybe the server scans all events to see whether they should be included in the response and then crashes because of one invalid event? Does it work with a new, empty calendar?

[AtomPlayed]

I tried creating a test calendar under the same email address, and added a few test events and that synced fine. It is probably something to do with a specific event that has a problem. I can try manually moving events to the other calendar until I find something that makes it crash. Any ideas you may have that could speed up that process? If you have any ideas of invalid characters or anything specific to look out for, that would also be helpful.

[AtomPlayed]

Alright, this is resolved. It was a single event set in the year 5602 causing the error - Was able to find it by switching to Event Search View in Thunderbird and scrolling all the way to the bottom of the list. As soon as I deleted that event, the calendar started syncing with Davx5 again. That timecode '56021006T180000' was literal. Not sure how Thunderbird was able to pull down event when Davx5 errored out, but I'm glad it was able to.

Really appreciate your help in this, the suggestion of an empty calendar nudged me in the direction to finding the solution.

[rfc2822]

There are various way to fetch the list of events; Thunderbird probably lists all events with PROPFIND. This is equal to DAVx5 setting Past events time limit: . But in the default setting, DAVx5 will sync only events from the last 90 days to save traffic etc.

[remiv1]

I don't have any problem but when I create a contact from my phone (Redmi Note 13), this problem apears expected 207 and receive 200 in place.

[tonioc-gh]

Also started to get these notifications on 2 devices running on Android 16 an Android 10 after last update. Is there some fix expected soon?