Add Streamable HTTP transport, progress/notifications, and ping#17
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…g support Features: - StreamableHttpTransport client: single POST endpoint with session management - StreamableHttpServerWrapper: MCP 2025-03-26 compliant server - ServerSession::send_notification() and send_progress() for server-to-client messages - ping method support in all MCP handlers Implementation: - Client transport uses Mcp-Session-Id header for session tracking - Server wrapper manages sessions via thread-safe session map - Progress notifications sent via existing SSE infrastructure - All 7 handler variants support ping method Tests: - 59/59 unit tests passing - Streamable HTTP integration tests - Interop tests (T5: C++ server + Python fastmcp client) Spec: MCP 2025-03-26 (Streamable HTTP transport)
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Summary
ServerSession::send_notification()andsend_progress()Changes
Client
StreamableHttpTransport: Single POST endpoint at/mcpwithMcp-Session-Idheader for session managementServer
StreamableHttpServerWrapper: Thread-safe session management, request routingServerSession: New methods for sending notifications and progress updates to clientsHandler
pingmethod support in all handler variants (ToolManager, Server, McpApp, ProxyApp, sampling)Test Plan