Support SSE protocol with fixes of mcp client#211

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dIvYaNshhh wants to merge 14 commits intomainfrom

feature/gateway-sse-transport

Commits on Apr 8, 2026

Send notifications/initialized after protocol init
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Remove Connection hop-by-hop header from HTTP responses
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Replace raw socket HTTP POST with libcurl in connection manager
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Rename default SSE path from /events to /sse and add external_url config
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Wire config paths to filter chain and defer connection cleanup
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Add SSE/RPC path and external URL params to filter chain factory
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Implement SSE server transport with session registry
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Defer connection manager destruction during reconnect to prevent use-after-free
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Disable HTTP body timeout for client-mode connections to support SSE streams
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Fix SSE callback URL matching for reverse proxy paths and add request logging
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Fix background task timer lifetime and session cleanup on connection close
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Move closed connections to dead list instead of deferred destruction via dispatcher
dIvYaNshhh
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Commits on Apr 17, 2026