[FEATURE] Server-Sent Events (SSE) Streaming Support

[kavix]

WebSocket support exists, but SSE (Server-Sent Events) is not supported. SSE is widely used for real-time APIs and is simpler than WebSockets.

Proposed Implementation

kurl sse https://api.example.com/events

Real-time formatted output with event type coloring

Reconnection handling with Last-Event-ID

Filter by event type:

--sse-filter message

Save events to file:

--sse-output events.log

Why this matters

SSE is the standard for server-to-client streaming (logs, notifications, live updates). Many APIs use it exclusively.

Acceptance Criteria

• SSE connection and event parsing
• Colored event type display
• Auto-reconnection with exponential backoff
• Event filtering and routing
• Connection health monitoring