[Bug]: PHP Warning: Cannot modify header information - headers already sent in sabre/http Sapi.php during PROPFIND requests on .nomedia
Open
@CarlSchwan is already working on this.
Since Aug 20, 2026.
2. developing
34-feedback
bug
- Dominant language
- PHP
- Stars
- 36.9k
- Forks
- 5.2k
- Avg merge
- 2d 3h
- Merged PRs (30d)
- 713
Description
⚠️ This issue respects the following points: ⚠️
- This is a bug, not a question or a configuration/webserver/proxy issue.
- This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
- Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
- I agree to follow Nextcloud's Code of Conduct.
Bug description
Since enabling the notify_push (High Performance Backend) app and/or updating from 34.0.1 to 34.0.2 and optimizing client interactions, i observe intermittent PHP warnings in the Nextcloud log during WebDAV PROPFIND requests (specifically targeting .nomedia files, often routed through proxies/Cloudflare).
While synchronization and functionality are completely unaffected, these warnings clutter the logs.
[PHP] Warnung: Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68
PROPFIND /public.php/webdav/blaaa/.nomemories
von 172.xx.xxx.247 von -- um 26.07.2026, 21:50:53
Steps to reproduce
1.Enable notify_push (High Performance Backend) with Redis and a proper reverse proxy chain.
2.Have clients (or sync tools) perform background WebDAV queries/PROPFIND requests (e.g., checking for .nomedia files).
3.Check the Nextcloud log.
Expected behavior
WebDAV requests should complete without triggering PHP header warnings.
Nextcloud Server version
34
Operating system
Debian/Ubuntu
PHP engine version
PHP 8.4
Web server
Nginx
Database engine version
MariaDB
Is this bug present after an update or on a fresh install?
after update from 34.0.1 to 34.0.2
Are you using the Nextcloud Server Encryption module?
Encryption is Disabled
What user-backends are you using?
- Default user-backend (database)
- LDAP/ Active Directory
- SSO - SAML
- Other
Configuration report
root@LXC-Nextcloud:~# occ config:list system
{
"system": {
"serverid": 1,
"instanceid": "***REMOVED SENSITIVE VALUE***",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"10.0.10.12",
"cloud2.underwater-way.com"
],
"trusted_proxies": "***REMOVED SENSITIVE VALUE***",
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "mysql",
"version": "34.0.2.1",
"overwrite.cli.url": "https:\/\/cloud2.underwater-way.com",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbtableprefix": "oc_",
"mysql.utf8mb4": true,
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"overwritehost": "cloud2.underwater-way.com",
"activity_expire_days": 14,
"allow_local_remote_servers": true,
"auth.bruteforce.protection.enabled": true,
"forbidden_filenames": [
".htaccess",
"Thumbs.db",
"thumbs.db"
],
"cron_log": true,
"default_phone_region": "DE",
"enable_previews": true,
"enabledPreviewProviders": [
"OC\\Preview\\PNG",
"OC\\Preview\\JPEG",
"OC\\Preview\\GIF",
"OC\\Preview\\BMP",
"OC\\Preview\\XBitmap",
"OC\\Preview\\Movie",
"OC\\Preview\\PDF",
"OC\\Preview\\MP3",
"OC\\Preview\\TXT",
"OC\\Preview\\MarkDown",
"OC\\Preview\\HEIC",
"OC\\Preview\\Movie",
"OC\\Preview\\MKV",
"OC\\Preview\\MP4",
"OC\\Preview\\AVI"
],
"filesystem_check_changes": 0,
"filelocking.enabled": "true",
"htaccess.RewriteBase": "\/",
"integrity.check.disabled": false,
"knowledgebaseenabled": false,
"logfile": "\/var\/log\/nextcloud\/nextcloud.log",
"debug": false,
"loglevel": 3,
"logtimezone": "Europe\/Berlin",
"remember_login_cookie_lifetime": 7200,
"session_lifetime": 7200,
"session_keepalive": true,
"auto_logout": true,
"minimum.supported.desktop.version": "4.0.1",
"memcache.local": "\\OC\\Memcache\\APCu",
"memcache.locking": "\\OC\\Memcache\\Redis",
"overwriteprotocol": "https",
"preview_max_x": 1024,
"preview_max_y": 768,
"preview_max_scale_factor": 1,
"profile.enabled": false,
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"port": 0,
"password": "***REMOVED SENSITIVE VALUE***",
"timeout": 0.5,
"dbindex": 1
},
"quota_include_external_storage": false,
"share_folder": "\/Freigaben",
"skeletondirectory": "",
"trashbin_retention_obligation": "auto, 7",
"maintenance_window_start": 1,
"maintenance": false,
"memories.db.triggers.fcu": true,
"memories.exiftool": "\/var\/www\/nextcloud\/apps\/memories\/bin-ext\/exiftool-amd64-glibc",
"memories.vod.path": "\/var\/www\/nextcloud\/apps\/memories\/bin-ext\/go-vod-amd64",
"memories.vod.ffmpeg": "\/usr\/bin\/ffmpeg",
"memories.vod.ffprobe": "\/usr\/bin\/ffprobe",
"onlyoffice": {
"jwt_secret": "***REMOVED SENSITIVE VALUE***",
"jwt_header": "EUOFFICE"
},
"updater.secret": "***REMOVED SENSITIVE VALUE***",
"theme": "",
"versions_retention_obligation": "auto, 365",
"simpleSignUpLink.shown": false,
"upgrade.disable-web": false,
"log.condition": {
"apps": [
"admin_audit"
]
},
"log_rotate_size": "0"
}
}
List of activated Apps
Enabled:
- activity: 7.0.0
- admin_audit: 1.24.0
- appstore: 1.0.0
- bruteforcesettings: 7.0.0
- calendar: 6.5.1
- circles: 34.0.0
- cloud_federation_api: 1.18.0
- comments: 1.24.0
- contacts: 8.7.4
- contactsinteraction: 1.15.0
- dashboard: 7.14.0
- dav: 1.39.0
- eurooffice: 11.0.1
- federatedfilesharing: 1.24.0
- federation: 1.24.0
- files: 2.6.0
- files_downloadlimit: 5.2.0
- files_lock: 34.0.1
- files_pdfviewer: 7.0.0-dev.0
- files_reminders: 1.7.0
- files_sharing: 1.26.0
- files_trashbin: 1.24.0
- files_versions: 1.27.0
- firstrunwizard: 7.0.0-dev.0
- gpoddersync: 3.17.0
- integration_paperless: 1.0.13
- logreader: 7.0.0
- lookup_server_connector: 1.22.0
- memories: 8.1.0
- nextcloud_announcements: 6.0.0
- notes: 6.0.1
- notifications: 7.0.0-dev.1
- notify_push: 1.3.5
- oauth2: 1.22.0
- password_policy: 6.0.0-dev.0
- photos: 7.0.0
- previewgenerator: 5.14.0
- privacy: 6.0.0-dev.1
- profile: 1.3.0
- provisioning_api: 1.24.0
- recommendations: 7.0.0
- related_resources: 5.0.0-dev.0
- serverinfo: 6.0.0
- settings: 1.17.0
- sharebymail: 1.24.0
- support: 6.0.0
- survey_client: 6.0.0-dev.0
- suspicious_login: 12.0.0-dev.0
- text: 8.0.0
- theming: 2.9.0
- twofactor_backupcodes: 1.23.0
- twofactor_totp: 16.0.0
- updatenotification: 1.24.0
- user_oidc: 8.10.1
- user_status: 1.14.0
- viewer: 7.0.0-dev.0
- webhook_listeners: 1.6.0
- workflowengine: 2.16.0
Disabled:
- app_api: 34.0.0 (installed 32.0.0)
- encryption: 2.22.0
- files_external: 1.26.0
- office: 1.0.0 (installed 1.0.0)
- systemtags: 1.24.0 (installed 1.18.0)
- twofactor_nextcloud_notification: 8.0.0
- user_ldap: 1.25.0
- weather_status: 1.14.0 (installed 1.10.0)
Nextcloud Signing status
No errors have been found.
Nextcloud Logs
{"reqId":"nlGjfl72tqHq0f4bwvQ1","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.06/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"XV0eNYmAsVSdXXClYhPw","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.07/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#64","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"XV0eNYmAsVSdXXClYhPw","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.07/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"XV0eNYmAsVSdXXClYhPw","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.07/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"XV0eNYmAsVSdXXClYhPw","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.07/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"XV0eNYmAsVSdXXClYhPw","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.07/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"WZgNfbKZkmXreBSG04jl","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.07/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#64","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"WZgNfbKZkmXreBSG04jl","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.07/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"WZgNfbKZkmXreBSG04jl","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.07/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"WZgNfbKZkmXreBSG04jl","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.07/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"WZgNfbKZkmXreBSG04jl","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.07/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"jkN5w8KLi0R5vNW1SkFJ","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.08/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#64","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"jkN5w8KLi0R5vNW1SkFJ","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.08/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"jkN5w8KLi0R5vNW1SkFJ","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.08/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"jkN5w8KLi0R5vNW1SkFJ","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.08/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"jkN5w8KLi0R5vNW1SkFJ","level":2,"time":"2026-07-26T21:50:52+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.08/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"gByq8hfLji4Z2cI0ff5O","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.08/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#64","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"gByq8hfLji4Z2cI0ff5O","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.08/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"gByq8hfLji4Z2cI0ff5O","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.08/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"gByq8hfLji4Z2cI0ff5O","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.08/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"gByq8hfLji4Z2cI0ff5O","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Michi%20Haushofer/2025.12.08/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"llygTC8Fqghb3Yg2XOtE","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Peter2025/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#64","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"llygTC8Fqghb3Yg2XOtE","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Peter2025/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"llygTC8Fqghb3Yg2XOtE","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Peter2025/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"llygTC8Fqghb3Yg2XOtE","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Peter2025/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"llygTC8Fqghb3Yg2XOtE","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Peter2025/.nomedia","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"AJJqLSWjU5w5IWSgvsSO","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Peter2025/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#64","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"AJJqLSWjU5w5IWSgvsSO","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Peter2025/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"AJJqLSWjU5w5IWSgvsSO","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Peter2025/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"AJJqLSWjU5w5IWSgvsSO","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Peter2025/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
{"reqId":"AJJqLSWjU5w5IWSgvsSO","level":2,"time":"2026-07-26T21:50:53+02:00","remoteAddr":"172.71.141.247","user":"--","app":"PHP","method":"PROPFIND","url":"/public.php/webdav/%40Tauchen/2025/Peter2025/.nomemories","scriptName":"/public.php","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/sabre/http/lib/Message.php:117) at /var/www/nextcloud/3rdparty/sabre/http/lib/Sapi.php#68","userAgent":"sabre-dav/4.6.0 (http://sabre.io/)","version":"34.0.2.1","data":{"app":"PHP"}}
Additional info
-
i made a update from/to 34.0.1/34.0.2
-
i installed and configured notify_push
-
and made following changes in the config:
occ config:system:set remember_login_cookie_lifetime --value="1800"
occ config:system:set log_rotate_size --value="104857600"
occ config:system:set trashbin_retention_obligation --value="auto, 7"
occ config:system:set versions_retention_obligation --value="auto, 365"
occ config:system:set simpleSignUpLink.shown --type=bool --value=false
occ config:system:set upgrade.disable-web --type=bool --value=true
occ config:app:set text workspace_available --value=0
occ config:system:set loglevel --value="2"
occ config:app:set settings profile_enabled_by_default --value="0"
occ app:enable admin_audit
occ config:app:set admin_audit logfile --value="/var/log/nextcloud/audit.log"
occ config:system:set log.condition apps 0 --value admin_audit
- and
`'remember_login_cookie_lifetime' => 7200,
'session_lifetime' => 7200,
'session_keepalive' => true,
'auto_logout' => true,`
-
and in /etc/php/8.4/fpm/php.ini
session.gc_maxlifetime = 7200 -
and in /etc/sysctl.d/100-nextcloud.conf
# Schutz gegen IP-Spoofing (IPv4 und IPv6)
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv6.conf.all.accept_source_route = 0
net.ipv6.conf.default.accept_source_route = 0
# Schutz gegen TCP-SYN-Flooding (IPv4)
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 4096
net.ipv4.tcp_synack_retries = 2
net.core.somaxconn = 1024
# ICMP Echo Ignore Broadcasts (IPv4)
net.ipv4.icmp_echo_ignore_broadcasts = 1
# ICMP Redirects deaktivieren (IPv4 und IPv6)
net.ipv4.conf.all.accept_redirects = 0
net.ipv6.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv6.conf.default.accept_redirects = 0
# Sourcen-Routing deaktivieren (IPv4 und IPv6)
net.ipv4.conf.all.accept_source_route = 0
net.ipv6.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv6.conf.default.accept_source_route = 0
# TCP-Timestamps deaktivieren (IPv4)
net.ipv4.tcp_timestamps = 0
# Loggen von Martian-Paketen (IPv4 und IPv6)
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.log_martians = 1
net.ipv6.conf.all.log_martians = 1
net.ipv6.conf.default.log_martians = 1
# Maximale Anzahl von halb offenen Verbindungen (IPv4)
net.ipv4.tcp_max_syn_backlog = 4096
# Netzwerkspeichergrößen erhöhen (IPv4 und IPv6)
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.core.rmem_default = 262144
net.core.wmem_default = 262144
net.core.optmem_max = 40960
# Maximale Anzahl von Verbindungstrackings erhöhen (IPv4 und IPv6)
net.netfilter.nf_conntrack_max = 262144
net.netfilter.nf_conntrack_tcp_timeout_established = 1800
# Maximaler Backlog für Netzwerkgeräte erhöhen (IPv4 und IPv6)
net.core.netdev_max_backlog = 5000
# TCP-Verbindungseinstellungen optimieren (IPv4)
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_keepalive_time = 300
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_keepalive_intvl = 15
# Datei-Deskriptor-Limits erhöhen
fs.file-max = 2097152
# TCP-Warteschlangen (Read/Write Queues) erhöhen (IPv4)
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
# TCP-Window-Scaling aktivieren (IPv4)
net.ipv4.tcp_window_scaling = 1
# TCP-Memory-Management optimieren (IPv4)
net.ipv4.tcp_mem = 50576 64768 98152
# Reverse Path Filtering aktivieren (IPv4 und IPv6)
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv6.conf.all.rp_filter = 1
net.ipv6.conf.default.rp_filter = 1
# TCP Fast Open aktivieren (optional, IPv4)
net.ipv4.tcp_fastopen = 3
# ARP-Caching verbessern (IPv4)
net.ipv4.neigh.default.gc_thresh1 = 1024
net.ipv4.neigh.default.gc_thresh2 = 2048
net.ipv4.neigh.default.gc_thresh3 = 4096
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Assessment
This issue has not been assessed yet.