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Torjus Håkestad 08f8b2cd83 feat: add SSE keepalive messages for connection health ...

Add configurable SSEKeepAlive interval (default: 15s) that sends SSE
comment lines (`:keepalive`) to maintain connection health.

Benefits:
- Keeps connections alive through proxies/load balancers that timeout
  idle connections
- Detects stale connections earlier (write failures terminate the
  handler)
- Standard SSE pattern - comments are ignored by compliant clients

Configuration:
- SSEKeepAlive > 0: send keepalives at specified interval
- SSEKeepAlive = 0: use default (15s)
- SSEKeepAlive < 0: disable keepalives

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-02-03 22:10:58 +01:00

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