Implements automatic Connection header behavior to match Node.js:
- Automatically adds "Connection: keep-alive" when no Connection header is set
- Automatically adds "Connection: close" when connection should be closed
- Respects user-provided Connection headers
- Respects explicitly removed Connection headers (via removeHeader)
Fixes Node.js HTTP compatibility by ensuring proper HTTP/1.1 keep-alive behavior.
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Co-Authored-By: Claude <noreply@anthropic.com>