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Implement UDP tunneling over HTTP/3 using HTTP Datagrams (RFC 9297): - Add masque handler for server-side CONNECT-UDP - Add masque connector and h3-masque dialer for client-side - Add enableDatagrams option to HTTP/3 listener - Add shared utilities for datagram connections and path parsing Resource management and connection caching: - Add deferred stream cleanup in connector on error paths - Add IsClosed() and Close() methods to Client for proper session management - Clean up stale cached clients in dialer before reuse - Close underlying stream when DatagramConn is closed - Move RequestStream opening from connector to dialer to enable dead connection detection and cache invalidation (follows QUIC dialer pattern)
Extend MASQUE implementation to support TCP tunneling via standard HTTP/3 CONNECT method, in addition to existing UDP support via CONNECT-UDP: - Add StreamConn type for TCP data transfer over HTTP/3 stream body - Update handler to dispatch based on :protocol pseudo-header: - "connect-udp" for UDP (RFC 9298) - Empty/"HTTP/3.0" for TCP (RFC 9114) - Add handleConnectTCP() using bidirectional stream relay - Update connector to support both TCP and UDP networks - Add connectTCP() for standard CONNECT requests TCP uses :authority for target address and stream body for data. UDP uses path template and HTTP/3 datagrams for data.
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Blocked by #75.