tomholford dad86ff10b caddyhttp: add terminating WebTransport handler ... Introduces http.handlers.webtransport, an EXPERIMENTAL handler that terminates an incoming WebTransport session on top of Caddy's HTTP/3 server and echoes bytes on each bidirectional stream. Primary use case is as a test upstream for the forthcoming WebTransport reverse-proxy transport; it also serves as the minimal proof that the server-side WebTransport wiring works end-to-end. Plumbing changes: * caddyhttp.Server gains a *webtransport.Server field alongside h3server. It's built in buildWebTransportServer(), wrapping the existing http3.Server. Exposed via WebTransportServer() any on the Server, so the caddyhttp public API does not name the upstream webtransport-go type (per AGENTS.md). * serveHTTP3 now runs a custom accept loop (serveH3AcceptLoop) that dispatches each accepted QUIC connection to webtransport.Server.ServeQUICConn instead of http3.Server.ServeListener. The WebTransport server transparently forwards non-WT streams to the underlying http3 request handler (cost: one varint peek per stream), so behavior for non-WT clients is unchanged. * ListenQUIC enables EnableDatagrams and EnableStreamResetPartialDelivery on the QUIC listener config. These are capability bits negotiated during the QUIC handshake and are prerequisites for any WebTransport session; they do not force usage so non-WT H3 traffic is unaffected. * Stop path closes wtServer after h3server.Shutdown to clean up any remaining WebTransport session state. The handler uses caddyhttp.UnwrapResponseWriterAs to reach the naked http3.Settingser/HTTPStreamer writer through Caddy's wrapping chain before calling webtransport.Server.Upgrade. Includes unit tests for request-shape detection plus an integration test (caddytest/integration/webtransport_test.go) that spins up a Caddy HTTP/3 server with the handler, dials it with a real webtransport.Dialer, and asserts end-to-end bidirectional-stream echo.		2026-06-23 19:04:23 +09:00
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imports.go	caddyhttp: add terminating WebTransport handler	2026-06-23 19:04:23 +09:00