Help- HTTP 400 error with Yahoo Calendar

[viiuan]

This started randomly 3 weeks ago, it still actually synced but notified about HTTP 400 error, so I know I didn't enter the wrong address.
When I tried to delete and re-add the Yahoo account it no longer syncs to my calendar app. Freaking out because my calendar syncing is kind of a lifeline.

Debug log here with redacted addresses and names.

Please click to expand

SYNCHRONIZATION INFO
Account: Account {name=redacted@yahoo.com, type=bitfire.at.davdroid}
Authority: com.android.calendar

EXCEPTION
at.bitfire.dav4jvm.exception.HttpException: HTTP 400 
	at at.bitfire.dav4jvm.DavResource.checkStatus(DavResource.kt:3)
	at at.bitfire.dav4jvm.DavResource.checkStatus(DavResource.kt:1)
	at at.bitfire.dav4jvm.DavResource.processMultiStatus(DavResource.kt:2)
	at at.bitfire.dav4jvm.DavResource.propfind(DavResource.kt:76)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$queryCapabilities$1.invoke(CalendarSyncManager.kt:3)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager$queryCapabilities$1.invoke(CalendarSyncManager.kt:1)
	at at.bitfire.davdroid.syncadapter.SyncManager.remoteExceptionContext(SyncManager.kt:1)
	at at.bitfire.davdroid.syncadapter.SyncManager.remoteExceptionContext(SyncManager.kt:5)
	at at.bitfire.davdroid.syncadapter.CalendarSyncManager.queryCapabilities(CalendarSyncManager.kt:6)
	at at.bitfire.davdroid.syncadapter.SyncManager$performSync$1.invoke(SyncManager.kt:8)
	at `at.bitfire.davdroid.syncadapter.SyncManager$performSync$1.invoke(SyncManager.kt:1)
	at at.bitfire.davdroid.syncadapter.SyncManager.unwrapExceptions(SyncManager.kt:2)
	at at.bitfire.davdroid.syncadapter.SyncManager.performSync(SyncManager.kt:20)
	at at.bitfire.davdroid.syncadapter.CalendarSyncer.sync(CalendarSyncer.kt:175)
	at at.bitfire.davdroid.syncadapter.Syncer.onPerformSync(Syncer.kt:119)
	at at.bitfire.davdroid.syncadapter.SyncWorker.doWork(SyncWorker.kt:432)
	at androidx.work.Worker$1.run(Worker.java:3)`
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
	at java.lang.Thread.run(Thread.java:764)

HTTP REQUEST
Request{method=PROPFIND, url=https://caldav.calendar.yahoo.com/dav/redacted-id/Calendar/Redactee%2520Name/, headers=[Depth:0, User-Agent:DAVx5/4.3.8-ose (2023/10/12; dav4jvm; okhttp/4.11.0) Android/8.0.0, Accept-Language:en-CA, en;q=0.7, *;q=0.5]}
<?xml version='1.0' encoding='UTF-8' ?><propfind xmlns="DAV:" xmlns:CAL="urn:ietf:params:xml:ns:caldav" xmlns:CARD="urn:ietf:params:xml:ns:carddav"><prop><CAL:max-resource-size /><supported-report-set /><n0:getctag xmlns:n0="http://calendarserver.org/ns/" /><sync-token /></prop></propfind>

HTTP RESPONSE
Response{protocol=h2, code=400, message=, url=https://caldav.calendar.yahoo.com/dav/redacted-id/Calendar/Redacted%2520Name/}
<h1>Bad Message 400</h1><pre>reason: Ambiguous double encoding</pre>

LOCAL RESOURCE
null

REMOTE RESOURCE
https://caldav.calendar.yahoo.com/dav/redacted-id/Calendar/Redacted%2520Name/

SOFTWARE INFORMATION

┌────────────────────────────────┬───────────┬───────────┬─────────────────────────────────────┬───────┐
│ Package                        │ Version   │ Code      │ Installer                           │ Notes │
├────────────────────────────────┼───────────┼───────────┼─────────────────────────────────────┼───────┤
│ at.bitfire.davdroid            │ 4.3.8-ose │ 403080000 │ com.google.android.packageinstaller │       │
│ org.tasks                      │ 13.4      │ 130400    │ com.google.android.packageinstaller │       │
│ com.android.providers.contacts │ 2.0.53    │ 205300000 │ —                                   │       │
│ com.android.providers.calendar │ 1.0.00.35 │ 100000035 │ —                                   │       │
│ com.samsung.android.contacts   │ 3.8.27.5  │ 382700005 │ —                                   │       │
│ com.samsung.android.calendar   │ 4.4.09.1  │ 440900001 │ com.sec.android.app.samsungapps     │       │
└────────────────────────────────┴───────────┴───────────┴─────────────────────────────────────┴───────┘


SYSTEM INFORMATION

Android version: 8.0.0 (R16NW.A520WVLSECTJ1)
Device: samsung SM-A520W (a5y17ltecan)

Locale(s): [en_CA]
Time zone: America/Toronto
Internal memory (/data): 10 GB free of 22 GB


CONNECTIVITY

 ☒ wlan0
   - [ Transports: WIFI Capabilities: NOT_METERED INTERNET NOT_RESTRICTED TRUSTED NOT_VPN VALIDATED FOREGROUND LinkUpBandwidth>=1048576Kbps LinkDnBandwidth>=1048576Kbps SignalStrength: -62]
   - DNS: 8.8.8.8, 8.8.4.4
 ☐ ?
   - [ Transports: WIFI Capabilities: WIFI_P2P NOT_RESTRICTED TRUSTED NOT_VPN LinkUpBandwidth>=1048576Kbps LinkDnBandwidth>=1048576Kbps]
   - DNS: 
 ☐ rmnet1
   - [ Transports: CELLULAR Capabilities: IMS NOT_METERED TRUSTED NOT_VPN VALIDATED FOREGROUND LinkUpBandwidth>=51200Kbps LinkDnBandwidth>=102400Kbps Specifier: <1>]
   - DNS: 

Data saver: disabled


CONFIGURATION

Power saving disabled: yes
System-wide synchronization: automatically

Notifications:
 - sync
 - status: importance=2
 - syncProblems: importance=3
 - general: importance=3
 - debug: importance=4
 - syncIoErrors: importance=1
 - syncWarnings: importance=2

Permissions:
 - ACCESS_NETWORK_STATE: granted
 - ACCESS_WIFI_STATE: granted
 - FOREGROUND_SERVICE: denied
 - INTERNET: granted
 - POST_NOTIFICATIONS: granted
 - READ_SYNC_SETTINGS: granted
 - READ_SYNC_STATS: granted
 - WRITE_SYNC_SETTINGS: granted
 - RECEIVE_BOOT_COMPLETED: granted
 - REQUEST_IGNORE_BATTERY_OPTIMIZATIONS: granted
 - READ_CONTACTS: granted
 - WRITE_CONTACTS: granted
 - READ_CALENDAR: granted
 - WRITE_CALENDAR: granted
 - ACCESS_COARSE_LOCATION: denied
 - ACCESS_FINE_LOCATION: denied
 - ACCESS_BACKGROUND_LOCATION: denied
 - org.dmfs.permission.READ_TASKS: denied
 - org.dmfs.permission.WRITE_TASKS: denied
 - org.tasks.permission.READ_TASKS: granted
 - org.tasks.permission.WRITE_TASKS: granted
 - at.techbee.jtx.permission.READ: denied
 - at.techbee.jtx.permission.WRITE: denied
 - WAKE_LOCK: granted
 - at.bitfire.davdroid.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION: granted


ACCOUNTS



 - Account: redacted@vivaldi.net

┌──────────────────────────────────┬───────────────┬──────────────────────┬────────────────────┬──────────┬───────────────────────────────────┐
│ Authority                        │ getIsSyncable │ getSyncAutomatically │ PeriodicSyncWorker │ Interval │ Entries                           │
├──────────────────────────────────┼───────────────┼──────────────────────┼────────────────────┼──────────┼───────────────────────────────────┤
│ at.bitfire.davdroid.addressbooks │ 1             │ true                 │ false              │ 240 min  │ —                                 │
│ com.android.calendar             │ 1             │ true                 │ false              │ 240 min  │ 63 event(s)                       │
│ at.techbee.jtx.provider          │ 0             │ false                │ false              │ —        │ n/a                               │
│ org.dmfs.tasks                   │ 0             │ false                │ false              │ —        │ n/a                               │
│ org.tasks.opentasks              │ 1             │ true                 │ false              │ 240 min  │ 3 tasks.org task(s)               │
│ com.android.contacts             │ 0             │ false                │ false              │ —        │ 0 wrongly assigned raw contact(s) │
└──────────────────────────────────┴───────────────┴──────────────────────┴────────────────────┴──────────┴───────────────────────────────────┘

  Authentication: user name, password
  WiFi only: false
  Contact group method: GROUP_VCARDS
  Time range (past days): null
  Default alarm (min before): null
  Manage calendar colors: true
  Use event colors: false

Sync workers:

┌───────────────────────────────────────────────────────────────────────────────────────────┬──────────────────────────────────┬───────────┬─────────┬────────────┬──────────────────────────────────────┐
│ Tags                                                                                      │ Authority                        │ State     │ Retries │ Generation │ ID                                   │
├───────────────────────────────────────────────────────────────────────────────────────────┼──────────────────────────────────┼───────────┼─────────┼────────────┼──────────────────────────────────────┤
│ [sync at.bitfire.davdroid.addressbooks bitfire.at.davdroid/redacted@vivaldi.net, SyncWorker] │ at.bitfire.davdroid.addressbooks │ SUCCEEDED │ 1       │ 0          │ 86fccae7-9480-4884-beb3-6091d9f3ceb2 │
│ [PeriodicSyncWorker, periodic-sync]                                                       │ at.bitfire.davdroid.addressbooks │ ENQUEUED  │ 0       │ 0          │ 503817c4-bb58-4856-89cc-ecccba813b00 │
│ [sync com.android.calendar bitfire.at.davdroid/redacted@vivaldi.net, SyncWorker]             │ com.android.calendar             │ SUCCEEDED │ 1       │ 0          │ 1f70c185-55df-49cd-9826-4ca95549a630 │
│ [PeriodicSyncWorker, periodic-sync]                                                       │ com.android.calendar             │ ENQUEUED  │ 0       │ 0          │ c67de46e-2370-4065-8a9c-0a50053dd3ef │
│ [sync org.tasks.opentasks bitfire.at.davdroid/redacted@vivaldi.net, SyncWorker]              │ org.tasks.opentasks              │ SUCCEEDED │ 1       │ 0          │ c2212418-830b-4fa4-8649-d4986fea3bef │
│ [PeriodicSyncWorker, periodic-sync]                                                       │ org.tasks.opentasks              │ ENQUEUED  │ 0       │ 0          │ a6d817ac-d29d-4a2b-beaa-7227c0319d6d │
└───────────────────────────────────────────────────────────────────────────────────────────┴──────────────────────────────────┴───────────┴─────────┴────────────┴──────────────────────────────────────┘





 - Account: redacted@yahoo.com

┌──────────────────────────────────┬───────────────┬──────────────────────┬────────────────────┬──────────┬───────────────────────────────────┐
│ Authority                        │ getIsSyncable │ getSyncAutomatically │ PeriodicSyncWorker │ Interval │ Entries                           │
├──────────────────────────────────┼───────────────┼──────────────────────┼────────────────────┼──────────┼───────────────────────────────────┤
│ at.bitfire.davdroid.addressbooks │ 0             │ false                │ false              │ —        │ —                                 │
│ com.android.calendar             │ 1             │ true                 │ true               │ 240 min  │ 0 event(s)                        │
│ at.techbee.jtx.provider          │ 0             │ false                │ false              │ —        │ n/a                               │
│ org.dmfs.tasks                   │ 0             │ false                │ false              │ —        │ n/a                               │
│ org.tasks.opentasks              │ 1             │ true                 │ true               │ 240 min  │ 3 tasks.org task(s)               │
│ com.android.contacts             │ 0             │ false                │ false              │ —        │ 0 wrongly assigned raw contact(s) │
└──────────────────────────────────┴───────────────┴──────────────────────┴────────────────────┴──────────┴───────────────────────────────────┘

  Authentication: user name, password
  WiFi only: false
  Contact group method: GROUP_VCARDS
  Time range (past days): 90
  Default alarm (min before): null
  Manage calendar colors: true
  Use event colors: false

Sync workers:

┌──────────────────────────────────────────────────────────────────────────────────────────────────┬──────────────────────────────────┬───────────┬─────────┬────────────┬──────────────────────────────────────┐
│ Tags                                                                                             │ Authority                        │ State     │ Retries │ Generation │ ID                                   │
├──────────────────────────────────────────────────────────────────────────────────────────────────┼──────────────────────────────────┼───────────┼─────────┼────────────┼──────────────────────────────────────┤
│ [sync at.bitfire.davdroid.addressbooks bitfire.at.davdroid/redacted@yahoo.com, SyncWorker]      │ at.bitfire.davdroid.addressbooks │ SUCCEEDED │ 1       │ 0          │ 8a68b839-dbf1-45d7-b4d1-d73f931201cf │
│ [SyncWorker, sync com.android.calendar bitfire.at.davdroid/redacted@yahoo.com]                  │ com.android.calendar             │ FAILED    │ 1       │ 0          │ 0bc887c4-4c6c-4b0d-9db7-a571a9908809 │
│ [PeriodicSyncWorker, periodic-sync com.android.calendar bitfire.at.davdroid/redacted@yahoo.com] │ com.android.calendar             │ ENQUEUED  │ 0       │ 5          │ c41740ac-2c1d-4374-8034-1e3a2cec3891 │
│ [SyncWorker, sync org.tasks.opentasks bitfire.at.davdroid/redacted@yahoo.com]                   │ org.tasks.opentasks              │ FAILED    │ 1       │ 0          │ f56fcaf7-8a86-46c9-8363-403f9c78fab8 │
│ [periodic-sync org.tasks.opentasks bitfire.at.davdroid/redactee@yahoo.com, PeriodicSyncWorker]  │ org.tasks.opentasks              │ ENQUEUED  │ 0       │ 4          │ 8b67d4ca-2b69-45ff-a178-ef05036b87c9 │
└──────────────────────────────────────────────────────────────────────────────────────────────────┴──────────────────────────────────┴───────────┴─────────┴────────────┴──────────────────────────────────────┘




DATABASE DUMP

android_metadata

┌────────┐
│ locale │
├────────┤
│ en_CA  │
└────────┘

service

┌────┬─────────────────────┬─────────┬──────────────────────────────────────────────────────────────────────────────────────────────┐
│ id │ accountName         │ type    │ principal                                                                                    │
├────┼─────────────────────┼─────────┼──────────────────────────────────────────────────────────────────────────────────────────────┤
│ 1  │ redacted@vivaldi.net   │ carddav │ https://calendar.vivaldi.net/principals/redacted@vivaldi.net/                                   │
│ 2  │ redacted@vivaldi.net   │ caldav  │ https://calendar.vivaldi.net/principals/redacted@vivaldi.net/                                   │
│ 8  │ redacted@yahoo.com │ caldav  │ https://caldav.calendar.yahoo.com/principals/users/redacted-id/ │
└────┴─────────────────────┴─────────┴──────────────────────────────────────────────────────────────────────────────────────────────┘

sqlite_sequence

┌────────────┬──────┐
│ name       │ seq  │
├────────────┼──────┤
│ service    │ 8    │
│ homeset    │ 8    │
│ principal  │ 8    │
│ collection │ 9    │
│ syncstats  │ 1940 │
└────────────┴──────┘

homeset

┌────┬───────────┬──────────┬──────────────────────────────────────────────────────────────────────────────────────────┬──────────┬─────────────┐
│ id │ serviceId │ personal │ url                                                                                      │ privBind │ displayName │
├────┼───────────┼──────────┼──────────────────────────────────────────────────────────────────────────────────────────┼──────────┼─────────────┤
│ 1  │ 1         │ 1        │ https://calendar.vivaldi.net/addressbooks/redacted@vivaldi.net/                             │ 1        │ —           │
│ 2  │ 2         │ 1        │ https://calendar.vivaldi.net/calendars/redacted@vivaldi.net/                                │ 1        │ —           │
│ 8  │ 8         │ 1        │ https://caldav.calendar.yahoo.com/dav/redacted-id/Calendar/ │ 1        │ Calendar    │
└────┴───────────┴──────────┴──────────────────────────────────────────────────────────────────────────────────────────┴──────────┴─────────────┘

collection

┌────┬───────────┬───────────┬─────────┬──────────────┬────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬──────────────────┬────────────┬───────────────┬─────────────────────┬────────────────────────────────────────────────────────────────────────┬───────────┬──────────┬────────────────┬───────────────┬──────────────────┬────────┬──────┐
│ id │ serviceId │ homeSetId │ ownerId │ type         │ url                                                                                                            │ privWriteContent │ privUnbind │ forceReadOnly │ displayName         │ description                                                            │ color     │ timezone │ supportsVEVENT │ supportsVTODO │ supportsVJOURNAL │ source │ sync │
├────┼───────────┼───────────┼─────────┼──────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼──────────────────┼────────────┼───────────────┼─────────────────────┼────────────────────────────────────────────────────────────────────────┼───────────┼──────────┼────────────────┼───────────────┼──────────────────┼────────┼──────┤
│ 1  │ 1         │ 1         │ 1       │ ADDRESS_BOOK │ https://calendar.vivaldi.net/addressbooks/redacted@vivaldi.net/default/                                           │ 1                │ 1          │ 0             │ Redacted's addressbook │ —                                                                      │ —         │ —        │ —              │ —             │ —                │ —      │ 0    │
│ 2  │ 2         │ 2         │ 2       │ CALENDAR     │ https://calendar.vivaldi.net/calendars/redacted@vivaldi.net/Redacted%27s%20Calendar/                                 │ 1                │ 1          │ 0             │ Redacted's Calendar    │ —                                                                      │ -12294480 │ —        │ 1              │ 1             │ 0                │ —      │ 1    │
│ 9  │ 8         │ 8         │ 8       │ CALENDAR     │ https://caldav.calendar.yahoo.com/dav/redacted-id/Calendar/Redacted%2520Name/ │ 1                │ 1          │ 0             │ Redacted Name   │ redacted-id's Calendar: Redacted Name │ -8093052  │ —        │ 1              │ 1             │ 0                │ —      │ 1    │
└────┴───────────┴───────────┴─────────┴──────────────┴────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴──────────────────┴────────────┴───────────────┴─────────────────────┴────────────────────────────────────────────────────────────────────────┴───────────┴──────────┴────────────────┴───────────────┴──────────────────┴────────┴──────┘

principal

┌────┬───────────┬─────────────────────────────────────────────────────────────────────────────────────────────┬──────────────────────────────────────────┐
│ id │ serviceId │ url                                                                                         │ displayName                              │
├────┼───────────┼─────────────────────────────────────────────────────────────────────────────────────────────┼──────────────────────────────────────────┤
│ 1  │ 1         │ https://calendar.vivaldi.net/principals/redacted@vivaldi.net                                   │ redacted@vivaldi.net                        │
│ 2  │ 2         │ https://calendar.vivaldi.net/principals/redacted@vivaldi.net                                   │ redacted@vivaldi.net                        │
│ 8  │ 8         │ https://caldav.calendar.yahoo.com/principals/users/redacted-id │ redacted-id │
└────┴───────────┴─────────────────────────────────────────────────────────────────────────────────────────────┴──────────────────────────────────────────┘

syncstats

┌──────┬──────────────┬──────────────────────┬───────────────┐
│ id   │ collectionId │ authority            │ lastSync      │
├──────┼──────────────┼──────────────────────┼───────────────┤
│ 1937 │ 2            │ org.tasks.opentasks  │ 1698468387319 │
│ 1938 │ 9            │ org.tasks.opentasks  │ 1698468387383 │
│ 1939 │ 9            │ com.android.calendar │ 1698468387421 │
│ 1940 │ 2            │ com.android.calendar │ 1698468387430 │
└──────┴──────────────┴──────────────────────┴───────────────┘

webdav_document: 0 row(s), data not listed here

webdav_mount

┌────┬──────┬─────┐
│ id │ name │ url │
├────┼──────┼─────┤
└────┴──────┴─────┘

room_master_table

┌────┬──────────────────────────────────┐
│ id │ identity_hash                    │
├────┼──────────────────────────────────┤
│ 42 │ 67fafceecee2d97cac6a62d46fa2c3e2 │
└────┴──────────────────────────────────┘


APP SETTINGS

1. SharedPreferencesProvider canWrite=true

┌────────────────────────────┬───────────────┐
│ Setting                    │ Value         │
├────────────────────────────┼───────────────┤
│ battery_optimization       │ true          │
│ distrust_system_certs      │ false         │
│ foreground_service         │ false         │
│ hint_AutostartPermissions  │ false         │
│ hint_OpenTasksNotInstalled │ false         │
│ time_nextDonationPopup     │ 1706242250240 │
└────────────────────────────┴───────────────┘

2. DefaultsProvider canWrite=false

┌────────────────────────────────┬────────────────────────────────────────────────┐
│ Setting                        │ Value                                          │
├────────────────────────────────┼────────────────────────────────────────────────┤
│ default_sync_interval          │ 14400                                          │
│ distrust_system_certs          │ false                                          │
│ force_read_only_addressbooks   │ false                                          │
│ ignore_vpns                    │ true                                           │
│ preselect_collections          │ 0                                              │
│ preselect_collections_excluded │ /z-app-generated--contactsinteraction--recent/ │
│ proxy_host                     │ localhost                                      │
│ proxy_port                     │ 9050                                           │
│ proxy_type                     │ -1                                             │
└────────────────────────────────┴────────────────────────────────────────────────┘

--- END DEBUG INFO ---```
</details>

[rfc2822]

I have updated https://www.davx5.com/tested-with/yahoo-mail. Please see the green box:

Yahoo CalDAV/CardDAV doesn't seem to be developed anymore and is broken in many ways. Also, we can test with it anymore (see below).

We don't recommend using Yahoo CalDAV/CardDAV with DAVx5.

[CHSDSpilka]

Hello, have you heard anything new about Yahoo CalDAV support since October? I've been using it for years with davx5 and bummed. It's odd, last week, I setup a new Yahoo token/password and set davx5 to "login with URL and user name" to the yahoo caldav url and it worked for a handful of days. But now I'm back to a "configuration detection" error.

[devvv4ever]

Yahoo is becoming worse every month. They don't seem to care about their services at all - I bet they don't even have any developer maintaining their CalDAV connection. We've got numerous reports in the last weeks from AOL (they rely on Yahoo services internally) and Yahoo users that a connection to the calendars is no longer possible (not sure if this is limited to CalDAV, but it is so for CalDAV at least).

I strongly suggest to switch to any other server/service in order to get a working CalDAV sync. We can't do anything to fix that and we most likely have to remove Yahoo from our list of services very soon...

Here is our guides list: https://www.davx5.com/tested-with

[devvv4ever]

I've got a message from one user who's CalDAV-connection started to work again yesterday. Maybe yahoo fixed something and it starts work for others too? Good luck to anyone using Yahoo!

[CHSDSpilka]

Yep, it just worked for me now too. We'll see for how long!