JavaScriptSolidServer

WebSocket Notifications

Real-time notifications for resource changes using the solid-0.1 protocol (SolidOS compatible).

jss start --notifications

Discovery

Clients discover the WebSocket URL via the Updates-Via header:

curl -I http://localhost:4443/alice/public/
# Updates-Via: ws://localhost:4443/.notifications

Protocol

Server: protocol solid-0.1
Client: sub http://localhost:4443/alice/public/data.json
Server: ack http://localhost:4443/alice/public/data.json
Server: pub http://localhost:4443/alice/public/data.json  (on change)

How It Works

1. Client connects to the WebSocket URL from Updates-Via
2. Server sends protocol solid-0.1 greeting
3. Client subscribes: sub <resource-url>
4. Server acknowledges: ack <resource-url>
5. On any change (PUT, PATCH, DELETE), server broadcasts: pub <resource-url>
6. Container subscriptions also fire when child resources change

ACL Enforcement

• Anonymous clients can subscribe to public resources
• Private resource subscriptions require authentication
• Cross-origin subscriptions are rejected

Live Reload

For development, --live-reload injects a script that auto-refreshes the browser when files change on disk:

jss start --live-reload --notifications

File system changes (editing files directly) also trigger WebSocket notifications.