HaRP incompatible with Docker API 1.43 on Synology DSM (client version 1.44 too new)

[louim-lbs]

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Steps to reproduce

1. Install Nextcloud on a Synology NAS (DSM 7.3.2) using Docker / Container Manager.
2. Install and enable the AppAPI app.
3. Deploy HaRP using the official image: ghcr.io/nextcloud/nextcloud-appapi-harp:release
4. Configure HaRP with mounted Docker socket: - /var/run/docker.sock:/var/run/docker.sock
5. In Nextcloud Admin → External Apps → Register daemon.
6. Click “Test” or attempt to register the daemon.

Expected behaviour

HaRP should successfully connect to the local Docker daemon and the deployment test should pass.

Actual behaviour

The daemon registration fails with a 400 error:

ClientException
Client error: `GET http://appapi-harp:8780/exapps/app_api/v1.44/_ping`
resulted in a `400 Bad Request` response:

{"message":"client version 1.44 is too new. Maximum supported API version is 1.43"}

On Synology DSM 7.3.2, Docker (Container Manager 24.0.2-1606) exposes API version 1.43 only.
Attempts to fix:

• Setting DOCKER_API_VERSION=1.43
• Setting both DOCKER_API_VERSION=1.43 and DOCKER_VERSION=1.43
• Forcing older image tags
• Recreating containers completely

The issue persists. It appears HaRP still negotiates or enforces API v1.44 internally.

This makes HaRP incompatible with Synology DSM Docker (API 1.43), even though Docker itself is working correctly.

Server configuration

Web server: Nginx (linuxserver)
Database: MariaDB
PHP version: 8.4.16
Nextcloud version: 32.0.6
Syno Linux: Linux 4.4.302+ x86_64

List of activated apps

Enabled:
  - activity: 5.0.0
  - admin_audit: 1.22.0
  - analytics: 6.0.2
  - announcementcenter: 7.3.0
  - app_api: 32.0.0
  - assistant: 2.12.0
  - bookmarks: 16.0.1
  - bruteforcesettings: 5.0.0
  - calendar: 6.2.0
  - call_summary_bot: 3.2.0
  - camerarawpreviews: 0.8.8
  - circles: 32.0.0
  - cloud_federation_api: 1.16.0
  - collectives: 3.6.1
  - comments: 1.22.0
  - contacts: 8.3.2
  - contactsinteraction: 1.13.1
  - context_chat: 5.2.1
  - cookbook: 0.11.6
  - dashboard: 7.12.0
  - dav: 1.34.2
  - deck: 1.16.3
  - drop_account: 2.8.0
  - event_update_notification: 2.8.0
  - external: 7.0.0
  - federatedfilesharing: 1.22.0
  - federation: 1.22.0
  - files: 2.4.0
  - files_antivirus: 6.1.0
  - files_downloadlimit: 5.0.0-dev.0
  - files_external: 1.24.1
  - files_pdfviewer: 5.0.0
  - files_reminders: 1.5.0
  - files_sharing: 1.24.1
  - files_trashbin: 1.22.0
  - files_versions: 1.25.0
  - firstrunwizard: 5.0.0
  - flow_notifications: 3.0.0
  - forms: 5.2.4
  - groupfolders: 20.1.11
  - impersonate: 3.0.1
  - integration_giphy: 2.2.0
  - integration_openai: 3.10.0
  - integration_openstreetmap: 3.0.0
  - integration_replicate: 4.2.0
  - integration_youtube: 0.6.1
  - intros: 1.2.1
  - inventory: 0.1.3
  - logreader: 5.0.0
  - lookup_server_connector: 1.20.0
  - mail: 5.7.0
  - memegen: 1.1.3
  - memories: 7.8.2
  - metadata: 0.23.0
  - money: 0.31.0
  - news: 27.2.0
  - nextcloud_announcements: 4.0.0
  - notes: 4.13.0
  - notifications: 5.0.0
  - notify_push: 1.3.0
  - oauth2: 1.20.0
  - password_policy: 4.0.0
  - passwords: 2025.12.21
  - phonetrack: 0.9.1
  - photos: 5.0.0
  - picker: 1.0.14
  - polls: 8.6.3
  - previewgenerator: 5.12.1
  - privacy: 4.0.0
  - profile: 1.1.0
  - provisioning_api: 1.22.0
  - quota_warning: 1.23.0
  - recommendations: 5.0.0
  - registration: 2.8.0
  - related_resources: 3.0.0
  - richdocuments: 9.0.2
  - serverinfo: 4.0.0
  - settings: 1.15.1
  - sharebymail: 1.22.0
  - side_menu: 5.1.3
  - sketch_picker: 2.3.0
  - socialsharing_email: 4.0.1
  - spreed: 22.0.9
  - support: 4.0.0
  - suspicious_login: 10.0.0
  - systemtags: 1.22.0
  - tables: 1.0.4
  - tasks: 0.17.1
  - text: 6.0.1
  - text_templates: 1.3.0
  - theming: 2.7.0
  - theming_customcss: 1.19.0
  - twofactor_backupcodes: 1.21.0
  - twofactor_email: 2.8.5
  - twofactor_nextcloud_notification: 6.0.0
  - twofactor_totp: 14.0.0
  - updatenotification: 1.22.0
  - user_ldap: 1.23.0
  - user_status: 1.12.0
  - users_picker: 1.2.2
  - viewer: 5.0.0
  - weather_status: 1.12.0
  - webhook_listeners: 1.3.0
  - welcome: 1.4.0
  - whiteboard: 1.5.6
  - workflow_pdf_converter: 3.0.0
  - workflow_script: 3.0.0
  - workflowengine: 2.14.0
Disabled:
  - encryption: 2.20.0 (installed 2.19.0)
  - files_downloadactivity: 1.18.1 (installed 1.18.1)
  - maps: 1.6.0 (installed 1.6.0)
  - survey_client: 4.0.0 (installed 1.15.0)
  - twofactor_reminder: 1.1.0 (installed 1.1.0)

Nextcloud configuration

{
    "system": {
        "memcache.local": "\\OC\\Memcache\\APCu",
        "filelocking.enabled": true,
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 6379,
            "password": "***REMOVED SENSITIVE VALUE***"
        },
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "overwrite.cli.url": "https:\/\/cloud.**.ovh",
        "overwritehost": "cloud.**.ovh",
        "overwriteprotocol": "https",
        "trusted_domains": [
            "192.168.1.58:8080",
            "cloud.**.ovh",
            "collabora.**.ovh",
            "board.**.ovh"
        ],
        "dbtype": "mysql",
        "version": "32.0.6.1",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "default_phone_region": "**",
        "maintenance": false,
        "maintenance_window_start": 1,
        "theme": "",
        "default_language": "fr",
        "loglevel": 2,
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "mail_smtpsecure": "tls",
        "mail_smtpauth": 1,
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "mail_max_sync_age": 360,
        "app.mail.background-sync-interval": 300,
        "twofactor_enforced": "false",
        "twofactor_enforced_groups": [],
        "twofactor_enforced_excluded_groups": [],
        "upgrade.disable-web": true,
        "updater.release.channel": "stable",
        "enabledPreviewProviders": [
            "OC\\Preview\\BMP",
            "OC\\Preview\\GIF",
            "OC\\Preview\\JPEG",
            "OC\\Preview\\Krita",
            "OC\\Preview\\MarkDown",
            "OC\\Preview\\MP3",
            "OC\\Preview\\OpenDocument",
            "OC\\Preview\\PNG",
            "OC\\Preview\\TXT",
            "OC\\Preview\\XBitmap",
            "OC\\Preview\\Font",
            "OC\\Preview\\HEIC",
            "OC\\Preview\\Movie",
            "OC\\Preview\\MKV",
            "OC\\Preview\\MP4",
            "OC\\Preview\\AVI",
            "OC\\Preview\\MSOffice2003",
            "OC\\Preview\\MSOffice2007",
            "OC\\Preview\\MSOfficeDoc",
            "OC\\Preview\\PDF",
            "OC\\Preview\\SVG",
            "OC\\Preview\\TIFF"
        ],
        "app_install_overwrite": {
            "0": "news",
            "1": "maps",
            "2": "inventory",
            "3": "health",
            "5": "side_menu",
            "6": "camerarawpreviews",
            "7": "twofactor_email"
        },
        "jpeg_quality": 60,
        "preview_max_x": 2048,
        "preview_max_y": 2048,
        "memories.exiftool": "\/config\/www\/nextcloud\/apps\/memories\/bin-ext\/exiftool-amd64-musl",
        "memories.vod.path": "\/config\/www\/nextcloud\/apps\/memories\/bin-ext\/go-vod-amd64",
        "memories.vod.ffmpeg": "\/usr\/bin\/ffmpeg",
        "memories.vod.ffprobe": "\/usr\/bin\/ffprobe",
        "memories.gis_type": 1,
        "ldapProviderFactory": "OCA\\User_LDAP\\LDAPProviderFactory",
        "memories.db.triggers.fcu": true,
        "defaultapp": "files,dashboard"
    }
}

Browser

Browser name: Brave
Operating system: Windows

Browser log

Insert your browser log here, this could for example include:
a) The javascript console log
b) The network log
c) ...

[oleksandr-nc]

Hello. This is an issue with AppAPI, not HaRP, since HaRP doesn't depend on the Docker version.

Since this is already the fifth or sixth issue on this topic, I think it's easier to resolve this and replying to everyone with a patch.

I'll try creating a pull request in the AppAPI repository tomorrow.

[oleksandr-nc]

Backport PR was merged: nextcloud/app_api#798

Will be part of the next release of Nextcloud 33