How to Use WebDAV Storage for AI Agents

WebDAV extends HTTP for collaborative file authoring. It adds methods like PROPFIND, PROPPATCH, MKCOL, COPY, MOVE, and LOCK to manage files and directories remotely.

For AI agents, WebDAV acts as persistent storage. Agents upload outputs, retrieve inputs, and coordinate via locks without custom APIs. Servers like Apache mod_dav or nginx-dav handle requests.

This fits self-hosted setups where agents need control over data location. Nextcloud and ownCloud expose WebDAV endpoints out of the box.

Helpful references: Fastio Workspaces, Fastio Collaboration, and Fastio AI.

Agents require reliable file I/O for artifacts, checkpoints, and logs. WebDAV works with any HTTP client library, avoiding vendor lock-in.

In practice, agents mount WebDAV as a drive or use libraries for operations. Locks prevent race conditions in multi-agent systems. Permissions map to agent API keys.

Self-hosted WebDAV keeps data on-premises. Drawbacks include setup overhead and limited agent-specific features compared to dedicated protocols.

Start with nginx for simplicity.

1. Install nginx and dav-ext module: apt install nginx-extras.

2. Configure /etc/nginx/sites-available/webdav: server { listen 443 ssl; dav_methods PUT DELETE MKCOL COPY MOVE; dav_ext_methods PROPFIND PROPPATCH; dav_access user:rw group:rw; autoindex on; location /dav { alias /var/webdav; auth_basic "Agent Storage"; auth_basic_user_file /etc/nginx/.htpasswd; } }

3. Create directory: mkdir /var/webdav && chown www-data:www-data /var/webdav.

4. Generate password: htpasswd -c /etc/nginx/.htpasswd agentuser.

Restart nginx. Endpoint: https://yourserver/dav.

Test with curl -u agentuser:pass -T test.txt https://yourserver/dav/test.txt.

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Map agent identities to WebDAV users. Use API keys as usernames.

In nginx, htpasswd stores credentials. For finer control, works alongside LDAP or OAuth.

Mount in agents:

Python example with webdavclient3:

from webdav3.client import Client

options = {
  'webdav_hostname': "https://yourserver",
  'webdav_login': 'agentuser',
  'webdav_password': 'apikey',
  'root_point': '/dav/'
}
client = Client(options)
client.upload_sync(remote_path='/agent-output.json', local_path='local.json')

Locks: client.lock('/file.txt', lock_info={'type': 'write', 'scope': 'exclusive', 'timeout': '-1'})

WebDAV lacks native agent tools like RAG indexing or webhooks, and setup typically requires sysadmin skills.

Fastio MCP provides multiple tools for agents: upload, list, search, locks, via Streamable HTTP. Free agent tier: multiple storage, multiple workspaces, no credit card.

Bridge WebDAV to MCP: proxy requests or use Fastio as primary with WebDAV fallback. Agents discover via https://fast.io/llms.txt.