Bump github.com/quic-go/quic-go from 0.47.0 to 0.48.1

Bumps [github.com/quic-go/quic-go](https://github.com/quic-go/quic-go) from 0.47.0 to 0.48.1.
- [Release notes](https://github.com/quic-go/quic-go/releases)
- [Changelog](https://github.com/quic-go/quic-go/blob/master/Changelog.md)
- [Commits](https://github.com/quic-go/quic-go/compare/v0.47.0...v0.48.1)

---
updated-dependencies:
- dependency-name: github.com/quic-go/quic-go
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -20,7 +20,7 @@ require (
 	github.com/miekg/dns v1.1.62
 	github.com/opencoff/go-sieve v0.2.1
 	github.com/powerman/check v1.7.0
-	github.com/quic-go/quic-go v0.47.0
+	github.com/quic-go/quic-go v0.48.1
 	golang.org/x/crypto v0.27.0
 	golang.org/x/net v0.29.0
 	golang.org/x/sys v0.25.0

go.sum

@@ -73,8 +73,8 @@ github.com/powerman/deepequal v0.1.0 h1:sVwtyTsBuYIvdbLR1O2wzRY63YgPqdGZmk/o80l+
 github.com/powerman/deepequal v0.1.0/go.mod h1:3k7aG/slufBhUANdN67o/UPg8i5YaiJ6FmibWX0cn04=
 github.com/quic-go/qpack v0.5.1 h1:giqksBPnT/HDtZ6VhtFKgoLOWmlyo9Ei6u9PqzIMbhI=
 github.com/quic-go/qpack v0.5.1/go.mod h1:+PC4XFrEskIVkcLzpEkbLqq1uCoxPhQuvK5rH1ZgaEg=
-github.com/quic-go/quic-go v0.47.0 h1:yXs3v7r2bm1wmPTYNLKAAJTHMYkPEsfYJmTazXrCZ7Y=
+github.com/quic-go/quic-go v0.48.1 h1:y/8xmfWI9qmGTc+lBr4jKRUWLGSlSigv847ULJ4hYXA=
-github.com/quic-go/quic-go v0.47.0/go.mod h1:3bCapYsJvXGZcipOHuu7plYtaV6tnF+z7wIFsU0WK9E=
+github.com/quic-go/quic-go v0.48.1/go.mod h1:yBgs3rWBOADpga7F+jJsb6Ybg1LSYiQvwWlLX+/6HMs=
 github.com/smartystreets/assertions v1.2.0 h1:42S6lae5dvLc7BrLu/0ugRtcFVjoJNMC/N3yZFZkDFs=
 github.com/smartystreets/assertions v1.2.0/go.mod h1:tcbTF8ujkAEcZ8TElKY+i30BzYlVhC/LOxJk7iOWnoo=
 github.com/smartystreets/goconvey v1.7.2 h1:9RBaZCeXEQ3UselpuwUQHltGVXvdwm6cv1hgR6gDIPg=

vendor/github.com/quic-go/quic-go/.golangci.yml

@@ -43,3 +43,4 @@ issues:
     - path: _test\.go
       linters:
         - exhaustive
+        - prealloc

vendor/github.com/quic-go/quic-go/http3/capsule.go

@@ -6,16 +6,19 @@ import (
 	"github.com/quic-go/quic-go/quicvarint"
 )
 
-// CapsuleType is the type of the capsule.
+// CapsuleType is the type of the capsule
 type CapsuleType uint64
 
+// CapsuleProtocolHeader is the header value used to advertise support for the capsule protocol
+const CapsuleProtocolHeader = "Capsule-Protocol"
+
 type exactReader struct {
-	R *io.LimitedReader
+	R io.LimitedReader
 }
 
 func (r *exactReader) Read(b []byte) (int, error) {
 	n, err := r.R.Read(b)
-	if r.R.N > 0 {
+	if err == io.EOF && r.R.N > 0 {
 		return n, io.ErrUnexpectedEOF
 	}
 	return n, err
@@ -35,7 +38,7 @@ func (r *countingByteReader) ReadByte() (byte, error) {
 }
 
 // ParseCapsule parses the header of a Capsule.
-// It returns an io.LimitedReader that can be used to read the Capsule value.
+// It returns an io.Reader that can be used to read the Capsule value.
 // The Capsule value must be read entirely (i.e. until the io.EOF) before using r again.
 func ParseCapsule(r quicvarint.Reader) (CapsuleType, io.Reader, error) {
 	cbr := countingByteReader{ByteReader: r}
@@ -55,7 +58,7 @@ func ParseCapsule(r quicvarint.Reader) (CapsuleType, io.Reader, error) {
 		}
 		return 0, nil, err
 	}
-	return CapsuleType(ct), &exactReader{R: io.LimitReader(r, int64(l)).(*io.LimitedReader)}, nil
+	return CapsuleType(ct), &exactReader{R: io.LimitedReader{R: r, N: int64(l)}}, nil
 }
 
 // WriteCapsule writes a capsule

vendor/github.com/quic-go/quic-go/http3/client.go

@@ -9,7 +9,6 @@ import (
 	"net/http"
 	"net/http/httptrace"
 	"net/textproto"
-	"sync"
 	"time"
 
 	"github.com/quic-go/quic-go"
@@ -38,102 +37,122 @@ var defaultQuicConfig = &quic.Config{
 	KeepAlivePeriod:    10 * time.Second,
 }
 
-// SingleDestinationRoundTripper is an HTTP/3 client doing requests to a single remote server.
+// ClientConn is an HTTP/3 client doing requests to a single remote server.
-type SingleDestinationRoundTripper struct {
+type ClientConn struct {
-	Connection quic.Connection
+	connection
 
 	// Enable support for HTTP/3 datagrams (RFC 9297).
-	// If a QUICConfig is set, datagram support also needs to be enabled on the QUIC layer by setting EnableDatagrams.
+	// If a QUICConfig is set, datagram support also needs to be enabled on the QUIC layer by setting enableDatagrams.
-	EnableDatagrams bool
+	enableDatagrams bool
 
 	// Additional HTTP/3 settings.
 	// It is invalid to specify any settings defined by RFC 9114 (HTTP/3) and RFC 9297 (HTTP Datagrams).
-	AdditionalSettings map[uint64]uint64
+	additionalSettings map[uint64]uint64
-	StreamHijacker     func(FrameType, quic.ConnectionTracingID, quic.Stream, error) (hijacked bool, err error)
-	UniStreamHijacker  func(StreamType, quic.ConnectionTracingID, quic.ReceiveStream, error) (hijacked bool)
 
-	// MaxResponseHeaderBytes specifies a limit on how many response bytes are
+	// maxResponseHeaderBytes specifies a limit on how many response bytes are
 	// allowed in the server's response header.
-	// Zero means to use a default limit.
+	maxResponseHeaderBytes uint64
-	MaxResponseHeaderBytes int64
 
-	// DisableCompression, if true, prevents the Transport from requesting compression with an
+	// disableCompression, if true, prevents the Transport from requesting compression with an
 	// "Accept-Encoding: gzip" request header when the Request contains no existing Accept-Encoding value.
 	// If the Transport requests gzip on its own and gets a gzipped response, it's transparently
 	// decoded in the Response.Body.
 	// However, if the user explicitly requested gzip it is not automatically uncompressed.
-	DisableCompression bool
+	disableCompression bool
 
-	Logger *slog.Logger
+	logger *slog.Logger
 
-	initOnce      sync.Once
-	hconn         *connection
 	requestWriter *requestWriter
 	decoder       *qpack.Decoder
 }
 
-var _ http.RoundTripper = &SingleDestinationRoundTripper{}
+var _ http.RoundTripper = &ClientConn{}
 
-func (c *SingleDestinationRoundTripper) Start() Connection {
+// Deprecated: SingleDestinationRoundTripper was renamed to ClientConn.
-	c.initOnce.Do(func() { c.init() })
+// It can be obtained by calling NewClientConn on a Transport.
-	return c.hconn
+type SingleDestinationRoundTripper = ClientConn
-}
 
-func (c *SingleDestinationRoundTripper) init() {
+func newClientConn(
+	conn quic.Connection,
+	enableDatagrams bool,
+	additionalSettings map[uint64]uint64,
+	streamHijacker func(FrameType, quic.ConnectionTracingID, quic.Stream, error) (hijacked bool, err error),
+	uniStreamHijacker func(StreamType, quic.ConnectionTracingID, quic.ReceiveStream, error) (hijacked bool),
+	maxResponseHeaderBytes int64,
+	disableCompression bool,
+	logger *slog.Logger,
+) *ClientConn {
+	c := &ClientConn{
+		enableDatagrams:    enableDatagrams,
+		additionalSettings: additionalSettings,
+		disableCompression: disableCompression,
+		logger:             logger,
+	}
+	if maxResponseHeaderBytes <= 0 {
+		c.maxResponseHeaderBytes = defaultMaxResponseHeaderBytes
+	} else {
+		c.maxResponseHeaderBytes = uint64(maxResponseHeaderBytes)
+	}
 	c.decoder = qpack.NewDecoder(func(hf qpack.HeaderField) {})
 	c.requestWriter = newRequestWriter()
-	c.hconn = newConnection(
+	c.connection = *newConnection(
-		c.Connection.Context(),
+		conn.Context(),
-		c.Connection,
+		conn,
-		c.EnableDatagrams,
+		c.enableDatagrams,
 		protocol.PerspectiveClient,
-		c.Logger,
+		c.logger,
 		0,
 	)
 	// send the SETTINGs frame, using 0-RTT data, if possible
 	go func() {
-		if err := c.setupConn(c.hconn); err != nil {
+		if err := c.setupConn(); err != nil {
-			if c.Logger != nil {
+			if c.logger != nil {
-				c.Logger.Debug("Setting up connection failed", "error", err)
+				c.logger.Debug("Setting up connection failed", "error", err)
 			}
-			c.hconn.CloseWithError(quic.ApplicationErrorCode(ErrCodeInternalError), "")
+			c.connection.CloseWithError(quic.ApplicationErrorCode(ErrCodeInternalError), "")
 		}
 	}()
-	if c.StreamHijacker != nil {
+	if streamHijacker != nil {
-		go c.handleBidirectionalStreams()
+		go c.handleBidirectionalStreams(streamHijacker)
 	}
-	go c.hconn.HandleUnidirectionalStreams(c.UniStreamHijacker)
+	go c.connection.handleUnidirectionalStreams(uniStreamHijacker)
+	return c
 }
 
-func (c *SingleDestinationRoundTripper) setupConn(conn *connection) error {
+// OpenRequestStream opens a new request stream on the HTTP/3 connection.
+func (c *ClientConn) OpenRequestStream(ctx context.Context) (RequestStream, error) {
+	return c.connection.openRequestStream(ctx, c.requestWriter, nil, c.disableCompression, c.maxResponseHeaderBytes)
+}
+
+func (c *ClientConn) setupConn() error {
 	// open the control stream
-	str, err := conn.OpenUniStream()
+	str, err := c.connection.OpenUniStream()
 	if err != nil {
 		return err
 	}
 	b := make([]byte, 0, 64)
 	b = quicvarint.Append(b, streamTypeControlStream)
 	// send the SETTINGS frame
-	b = (&settingsFrame{Datagram: c.EnableDatagrams, Other: c.AdditionalSettings}).Append(b)
+	b = (&settingsFrame{Datagram: c.enableDatagrams, Other: c.additionalSettings}).Append(b)
 	_, err = str.Write(b)
 	return err
 }
 
-func (c *SingleDestinationRoundTripper) handleBidirectionalStreams() {
+func (c *ClientConn) handleBidirectionalStreams(streamHijacker func(FrameType, quic.ConnectionTracingID, quic.Stream, error) (hijacked bool, err error)) {
 	for {
-		str, err := c.hconn.AcceptStream(context.Background())
+		str, err := c.connection.AcceptStream(context.Background())
 		if err != nil {
-			if c.Logger != nil {
+			if c.logger != nil {
-				c.Logger.Debug("accepting bidirectional stream failed", "error", err)
+				c.logger.Debug("accepting bidirectional stream failed", "error", err)
 			}
 			return
 		}
 		fp := &frameParser{
 			r:    str,
-			conn: c.hconn,
+			conn: &c.connection,
 			unknownFrameHandler: func(ft FrameType, e error) (processed bool, err error) {
-				id := c.hconn.Context().Value(quic.ConnectionTracingKey).(quic.ConnectionTracingID)
+				id := c.connection.Context().Value(quic.ConnectionTracingKey).(quic.ConnectionTracingID)
-				return c.StreamHijacker(ft, id, str, e)
+				return streamHijacker(ft, id, str, e)
 			},
 		}
 		go func() {
@@ -141,26 +160,17 @@ func (c *SingleDestinationRoundTripper) handleBidirectionalStreams() {
 				return
 			}
 			if err != nil {
-				if c.Logger != nil {
+				if c.logger != nil {
-					c.Logger.Debug("error handling stream", "error", err)
+					c.logger.Debug("error handling stream", "error", err)
 				}
 			}
-			c.hconn.CloseWithError(quic.ApplicationErrorCode(ErrCodeFrameUnexpected), "received HTTP/3 frame on bidirectional stream")
+			c.connection.CloseWithError(quic.ApplicationErrorCode(ErrCodeFrameUnexpected), "received HTTP/3 frame on bidirectional stream")
 		}()
 	}
 }
 
-func (c *SingleDestinationRoundTripper) maxHeaderBytes() uint64 {
-	if c.MaxResponseHeaderBytes <= 0 {
-		return defaultMaxResponseHeaderBytes
-	}
-	return uint64(c.MaxResponseHeaderBytes)
-}
-
 // RoundTrip executes a request and returns a response
-func (c *SingleDestinationRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
+func (c *ClientConn) RoundTrip(req *http.Request) (*http.Response, error) {
-	c.initOnce.Do(func() { c.init() })
-
 	rsp, err := c.roundTrip(req)
 	if err != nil && req.Context().Err() != nil {
 		// if the context was canceled, return the context cancellation error
@@ -169,7 +179,7 @@ func (c *SingleDestinationRoundTripper) RoundTrip(req *http.Request) (*http.Resp
 	return rsp, err
 }
 
-func (c *SingleDestinationRoundTripper) roundTrip(req *http.Request) (*http.Response, error) {
+func (c *ClientConn) roundTrip(req *http.Request) (*http.Response, error) {
 	// Immediately send out this request, if this is a 0-RTT request.
 	switch req.Method {
 	case MethodGet0RTT:
@@ -200,17 +210,23 @@ func (c *SingleDestinationRoundTripper) roundTrip(req *http.Request) (*http.Resp
 		connCtx := c.Connection.Context()
 		// wait for the server's SETTINGS frame to arrive
 		select {
-		case <-c.hconn.ReceivedSettings():
+		case <-c.connection.ReceivedSettings():
 		case <-connCtx.Done():
 			return nil, context.Cause(connCtx)
 		}
-		if !c.hconn.Settings().EnableExtendedConnect {
+		if !c.connection.Settings().EnableExtendedConnect {
 			return nil, errors.New("http3: server didn't enable Extended CONNECT")
 		}
 	}
 
 	reqDone := make(chan struct{})
-	str, err := c.hconn.openRequestStream(req.Context(), c.requestWriter, reqDone, c.DisableCompression, c.maxHeaderBytes())
+	str, err := c.connection.openRequestStream(
+		req.Context(),
+		c.requestWriter,
+		reqDone,
+		c.disableCompression,
+		c.maxResponseHeaderBytes,
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -238,12 +254,6 @@ func (c *SingleDestinationRoundTripper) roundTrip(req *http.Request) (*http.Resp
 	return rsp, maybeReplaceError(err)
 }
 
-func (c *SingleDestinationRoundTripper) OpenRequestStream(ctx context.Context) (RequestStream, error) {
-	c.initOnce.Do(func() { c.init() })
-
-	return c.hconn.openRequestStream(ctx, c.requestWriter, nil, c.DisableCompression, c.maxHeaderBytes())
-}
-
 // cancelingReader reads from the io.Reader.
 // It cancels writing on the stream if any error other than io.EOF occurs.
 type cancelingReader struct {
@@ -259,7 +269,7 @@ func (r *cancelingReader) Read(b []byte) (int, error) {
 	return n, err
 }
 
-func (c *SingleDestinationRoundTripper) sendRequestBody(str Stream, body io.ReadCloser, contentLength int64) error {
+func (c *ClientConn) sendRequestBody(str Stream, body io.ReadCloser, contentLength int64) error {
 	defer body.Close()
 	buf := make([]byte, bodyCopyBufferSize)
 	sr := &cancelingReader{str: str, r: body}
@@ -283,7 +293,7 @@ func (c *SingleDestinationRoundTripper) sendRequestBody(str Stream, body io.Read
 	return err
 }
 
-func (c *SingleDestinationRoundTripper) doRequest(req *http.Request, str *requestStream) (*http.Response, error) {
+func (c *ClientConn) doRequest(req *http.Request, str *requestStream) (*http.Response, error) {
 	if err := str.SendRequestHeader(req); err != nil {
 		return nil, err
 	}
@@ -299,8 +309,8 @@ func (c *SingleDestinationRoundTripper) doRequest(req *http.Request, str *reques
 				contentLength = req.ContentLength
 			}
 			if err := c.sendRequestBody(str, req.Body, contentLength); err != nil {
-				if c.Logger != nil {
+				if c.logger != nil {
-					c.Logger.Debug("error writing request", "error", err)
+					c.logger.Debug("error writing request", "error", err)
 				}
 			}
 			str.Close()
@@ -337,7 +347,7 @@ func (c *SingleDestinationRoundTripper) doRequest(req *http.Request, str *reques
 		}
 		break
 	}
-	connState := c.hconn.ConnectionState().TLS
+	connState := c.connection.ConnectionState().TLS
 	res.TLS = &connState
 	res.Request = req
 	return res, nil

vendor/github.com/quic-go/quic-go/http3/conn.go

@@ -170,7 +170,7 @@ func (c *connection) CloseWithError(code quic.ApplicationErrorCode, msg string)
 	return c.Connection.CloseWithError(code, msg)
 }
 
-func (c *connection) HandleUnidirectionalStreams(hijack func(StreamType, quic.ConnectionTracingID, quic.ReceiveStream, error) (hijacked bool)) {
+func (c *connection) handleUnidirectionalStreams(hijack func(StreamType, quic.ConnectionTracingID, quic.ReceiveStream, error) (hijacked bool)) {
 	var (
 		rcvdControlStr      atomic.Bool
 		rcvdQPACKEncoderStr atomic.Bool
@@ -316,10 +316,12 @@ func (c *connection) receiveDatagrams() error {
 }
 
 // ReceivedSettings returns a channel that is closed once the peer's SETTINGS frame was received.
+// Settings can be optained from the Settings method after the channel was closed.
 func (c *connection) ReceivedSettings() <-chan struct{} { return c.receivedSettings }
 
 // Settings returns the settings received on this connection.
 // It is only valid to call this function after the channel returned by ReceivedSettings was closed.
 func (c *connection) Settings() *Settings { return c.settings }
 
+// Context returns the context of the underlying QUIC connection.
 func (c *connection) Context() context.Context { return c.ctx }

vendor/github.com/quic-go/quic-go/http3/frames.go

@@ -66,7 +66,8 @@ func (p *frameParser) ParseNext() (frame, error) {
 			return parseSettingsFrame(p.r, l)
 		case 0x3: // CANCEL_PUSH
 		case 0x5: // PUSH_PROMISE
-		case 0x7: // GOAWAY
+		case 0x7:
+			return parseGoAwayFrame(qr, l)
 		case 0xd: // MAX_PUSH_ID
 		case 0x2, 0x6, 0x8, 0x9:
 			p.conn.CloseWithError(quic.ApplicationErrorCode(ErrCodeFrameUnexpected), "")
@@ -194,3 +195,27 @@ func (f *settingsFrame) Append(b []byte) []byte {
 	}
 	return b
 }
+
+type goAwayFrame struct {
+	StreamID quic.StreamID
+}
+
+func parseGoAwayFrame(r io.ByteReader, l uint64) (*goAwayFrame, error) {
+	frame := &goAwayFrame{}
+	cbr := countingByteReader{ByteReader: r}
+	id, err := quicvarint.Read(&cbr)
+	if err != nil {
+		return nil, err
+	}
+	if cbr.Read != int(l) {
+		return nil, errors.New("GOAWAY frame: inconsistent length")
+	}
+	frame.StreamID = quic.StreamID(id)
+	return frame, nil
+}
+
+func (f *goAwayFrame) Append(b []byte) []byte {
+	b = quicvarint.Append(b, 0x7)
+	b = quicvarint.Append(b, uint64(quicvarint.Len(uint64(f.StreamID))))
+	return quicvarint.Append(b, uint64(f.StreamID))
+}

vendor/github.com/quic-go/quic-go/http3/server.go

@@ -13,6 +13,7 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/quic-go/quic-go"
@@ -45,6 +46,8 @@ const (
 	streamTypeQPACKDecoderStream = 3
 )
 
+const goawayTimeout = 5 * time.Second
+
 // A QUICEarlyListener listens for incoming QUIC connections.
 type QUICEarlyListener interface {
 	Accept(context.Context) (quic.EarlyConnection, error)
@@ -214,6 +217,12 @@ type Server struct {
 	listeners map[*QUICEarlyListener]listenerInfo
 
 	closed           bool
+	closeCtx         context.Context    // canceled when the server is closed
+	closeCancel      context.CancelFunc // cancels the closeCtx
+	graceCtx         context.Context    // canceled when the server is closed or gracefully closed
+	graceCancel      context.CancelFunc // cancels the graceCtx
+	connCount        atomic.Int64
+	connHandlingDone chan struct{}
 
 	altSvcHeader string
 }
@@ -265,8 +274,31 @@ func (s *Server) Serve(conn net.PacketConn) error {
 	return s.serveListener(ln)
 }
 
+// init initializes the contexts used for shutting down the server.
+// It must be called with the mutex held.
+func (s *Server) init() {
+	if s.closeCtx == nil {
+		s.closeCtx, s.closeCancel = context.WithCancel(context.Background())
+		s.graceCtx, s.graceCancel = context.WithCancel(s.closeCtx)
+	}
+	s.connHandlingDone = make(chan struct{}, 1)
+}
+
+func (s *Server) decreaseConnCount() {
+	if s.connCount.Add(-1) == 0 && s.graceCtx.Err() != nil {
+		close(s.connHandlingDone)
+	}
+}
+
 // ServeQUICConn serves a single QUIC connection.
 func (s *Server) ServeQUICConn(conn quic.Connection) error {
+	s.mutex.Lock()
+	s.init()
+	s.mutex.Unlock()
+
+	s.connCount.Add(1)
+	defer s.decreaseConnCount()
+
 	return s.handleConn(conn)
 }
 
@@ -289,14 +321,17 @@ func (s *Server) ServeListener(ln QUICEarlyListener) error {
 
 func (s *Server) serveListener(ln QUICEarlyListener) error {
 	for {
-		conn, err := ln.Accept(context.Background())
+		conn, err := ln.Accept(s.graceCtx)
-		if err == quic.ErrServerClosed {
+		// server closed
+		if errors.Is(err, quic.ErrServerClosed) || s.graceCtx.Err() != nil {
 			return http.ErrServerClosed
 		}
 		if err != nil {
 			return err
 		}
+		s.connCount.Add(1)
 		go func() {
+			defer s.decreaseConnCount()
 			if err := s.handleConn(conn); err != nil {
 				if s.Logger != nil {
 					s.Logger.Debug("handling connection failed", "error", err)
@@ -430,6 +465,7 @@ func (s *Server) addListener(l *QUICEarlyListener) error {
 	if s.listeners == nil {
 		s.listeners = make(map[*QUICEarlyListener]listenerInfo)
 	}
+	s.init()
 
 	laddr := (*l).Addr()
 	if port, err := extractPort(laddr.String()); err == nil {
@@ -453,9 +489,12 @@ func (s *Server) removeListener(l *QUICEarlyListener) {
 	s.generateAltSvcHeader()
 }
 
+// handleConn handles the HTTP/3 exchange on a QUIC connection.
+// It blocks until all HTTP handlers for all streams have returned.
 func (s *Server) handleConn(conn quic.Connection) error {
-	// send a SETTINGS frame
+	// open the control stream and send a SETTINGS frame, it's also used to send a GOAWAY frame later
-	str, err := conn.OpenUniStream()
+	// when the server is gracefully closed
+	ctrlStr, err := conn.OpenUniStream()
 	if err != nil {
 		return fmt.Errorf("opening the control stream failed: %w", err)
 	}
@@ -466,7 +505,7 @@ func (s *Server) handleConn(conn quic.Connection) error {
 		ExtendedConnect: true,
 		Other:           s.AdditionalSettings,
 	}).Append(b)
-	str.Write(b)
+	ctrlStr.Write(b)
 
 	ctx := conn.Context()
 	ctx = context.WithValue(ctx, ServerContextKey, s)
@@ -487,21 +526,60 @@ func (s *Server) handleConn(conn quic.Connection) error {
 		s.Logger,
 		s.IdleTimeout,
 	)
-	go hconn.HandleUnidirectionalStreams(s.UniStreamHijacker)
+	go hconn.handleUnidirectionalStreams(s.UniStreamHijacker)
 
+	var nextStreamID quic.StreamID
+	var wg sync.WaitGroup
+	var handleErr error
 	// Process all requests immediately.
 	// It's the client's responsibility to decide which requests are eligible for 0-RTT.
 	for {
-		str, datagrams, err := hconn.acceptStream(context.Background())
+		str, datagrams, err := hconn.acceptStream(s.graceCtx)
 		if err != nil {
+			// server (not gracefully) closed, close the connection immediately
+			if s.closeCtx.Err() != nil {
+				conn.CloseWithError(quic.ApplicationErrorCode(ErrCodeNoError), "")
+				handleErr = http.ErrServerClosed
+				break
+			}
+
+			// gracefully closed, send GOAWAY frame and wait for requests to complete or grace period to end
+			// new requests will be rejected and shouldn't be sent
+			if s.graceCtx.Err() != nil {
+				b = (&goAwayFrame{StreamID: nextStreamID}).Append(b[:0])
+				// set a deadline to send the GOAWAY frame
+				ctrlStr.SetWriteDeadline(time.Now().Add(goawayTimeout))
+				ctrlStr.Write(b)
+
+				select {
+				case <-hconn.Context().Done():
+					// we expect the client to eventually close the connection after receiving the GOAWAY
+				case <-s.closeCtx.Done():
+					// close the connection after graceful period
+					conn.CloseWithError(quic.ApplicationErrorCode(ErrCodeNoError), "")
+				}
+				handleErr = http.ErrServerClosed
+				break
+			}
+
 			var appErr *quic.ApplicationError
-			if errors.As(err, &appErr) && appErr.ErrorCode == quic.ApplicationErrorCode(ErrCodeNoError) {
+			if !errors.As(err, &appErr) || appErr.ErrorCode != quic.ApplicationErrorCode(ErrCodeNoError) {
-				return nil
+				handleErr = fmt.Errorf("accepting stream failed: %w", err)
 			}
-			return fmt.Errorf("accepting stream failed: %w", err)
+			break
 		}
-		go s.handleRequest(hconn, str, datagrams, hconn.decoder)
+
+		nextStreamID = str.StreamID() + 4
+		wg.Add(1)
+		go func() {
+			// handleRequest will return once the request has been handled,
+			// or the underlying connection is closed
+			defer wg.Done()
+			s.handleRequest(hconn, str, datagrams, hconn.decoder)
+		}()
 	}
+	wg.Wait()
+	return handleErr
 }
 
 func (s *Server) maxHeaderBytes() uint64 {
@@ -606,7 +684,7 @@ func (s *Server) handleRequest(conn *connection, str quic.Stream, datagrams *dat
 				if logger == nil {
 					logger = slog.Default()
 				}
-				logger.Error("http: panic serving", "arg", p, "trace", buf)
+				logger.Error("http: panic serving", "arg", p, "trace", string(buf))
 			}
 		}()
 		handler.ServeHTTP(r, req)
@@ -643,11 +721,17 @@ func (s *Server) handleRequest(conn *connection, str quic.Stream, datagrams *dat
 
 // Close the server immediately, aborting requests and sending CONNECTION_CLOSE frames to connected clients.
 // Close in combination with ListenAndServe() (instead of Serve()) may race if it is called before a UDP socket is established.
+// It is the caller's responsibility to close any connection passed to ServeQUICConn.
 func (s *Server) Close() error {
 	s.mutex.Lock()
 	defer s.mutex.Unlock()
 
 	s.closed = true
+	// server is never used
+	if s.closeCtx == nil {
+		return nil
+	}
+	s.closeCancel()
 
 	var err error
 	for ln := range s.listeners {
@@ -655,14 +739,44 @@ func (s *Server) Close() error {
 			err = cerr
 		}
 	}
+	if s.connCount.Load() == 0 {
+		return err
+	}
+	// wait for all connections to be closed
+	<-s.connHandlingDone
 	return err
 }
 
-// CloseGracefully shuts down the server gracefully. The server sends a GOAWAY frame first, then waits for either timeout to trigger, or for all running requests to complete.
+// Shutdown shuts down the server gracefully.
-// CloseGracefully in combination with ListenAndServe() (instead of Serve()) may race if it is called before a UDP socket is established.
+// The server sends a GOAWAY frame first, then or for all running requests to complete.
-func (s *Server) CloseGracefully(timeout time.Duration) error {
+// Shutdown in combination with ListenAndServe() (instead of Serve()) may race if it is called before a UDP socket is established.
-	// TODO: implement
+func (s *Server) Shutdown(ctx context.Context) error {
+	s.mutex.Lock()
+	s.closed = true
+	// server is never used
+	if s.closeCtx == nil {
+		s.mutex.Unlock()
 		return nil
+	}
+	s.graceCancel()
+	s.mutex.Unlock()
+
+	if s.connCount.Load() == 0 {
+		return s.Close()
+	}
+	select {
+	case <-s.connHandlingDone: // all connections were closed
+		// When receiving a GOAWAY frame, HTTP/3 clients are expected to close the connection
+		// once all requests were successfully handled...
+		return s.Close()
+	case <-ctx.Done():
+		// ... however, clients handling long-lived requests (and misbehaving clients),
+		// might not do so before the context is cancelled.
+		// In this case, we close the server, which closes all existing connections
+		// (expect those passed to ServeQUICConn).
+		_ = s.Close()
+		return ctx.Err()
+	}
 }
 
 // ErrNoAltSvcPort is the error returned by SetQUICHeaders when no port was found
@@ -690,11 +804,6 @@ func (s *Server) SetQUICHeaders(hdr http.Header) error {
 	return nil
 }
 
-// Deprecated: use SetQUICHeaders instead.
-func (s *Server) SetQuicHeaders(hdr http.Header) error {
-	return s.SetQUICHeaders(hdr)
-}
-
 // ListenAndServeQUIC listens on the UDP network address addr and calls the
 // handler for HTTP/3 requests on incoming connections. http.DefaultServeMux is
 // used when handler is nil.
@@ -706,11 +815,6 @@ func ListenAndServeQUIC(addr, certFile, keyFile string, handler http.Handler) er
 	return server.ListenAndServeTLS(certFile, keyFile)
 }
 
-// Deprecated: use ListenAndServeTLS instead.
-func ListenAndServe(addr, certFile, keyFile string, handler http.Handler) error {
-	return ListenAndServeTLS(addr, certFile, keyFile, handler)
-}
-
 // ListenAndServeTLS listens on the given network address for both TLS/TCP and QUIC
 // connections in parallel. It returns if one of the two returns an error.
 // http.DefaultServeMux is used when handler is nil.

vendor/github.com/quic-go/quic-go/http3/transport.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"log/slog"
 	"net"
 	"net/http"
 	"strings"
@@ -30,7 +31,7 @@ type Settings struct {
 
 // RoundTripOpt are options for the Transport.RoundTripOpt method.
 type RoundTripOpt struct {
-	// OnlyCachedConn controls whether the RoundTripper may create a new QUIC connection.
+	// OnlyCachedConn controls whether the Transport may create a new QUIC connection.
 	// If set true and no cached connection is available, RoundTripOpt will return ErrNoCachedConn.
 	OnlyCachedConn bool
 }
@@ -59,10 +60,8 @@ func (r *roundTripperWithCount) Close() error {
 	return nil
 }
 
-// RoundTripper implements the http.RoundTripper interface
+// Transport implements the http.RoundTripper interface
-type RoundTripper struct {
+type Transport struct {
-	mutex sync.Mutex
-
 	// TLSClientConfig specifies the TLS configuration to use with
 	// tls.Client. If nil, the default configuration is used.
 	TLSClientConfig *tls.Config
@@ -97,6 +96,13 @@ type RoundTripper struct {
 	// However, if the user explicitly requested gzip it is not automatically uncompressed.
 	DisableCompression bool
 
+	StreamHijacker    func(FrameType, quic.ConnectionTracingID, quic.Stream, error) (hijacked bool, err error)
+	UniStreamHijacker func(StreamType, quic.ConnectionTracingID, quic.ReceiveStream, error) (hijacked bool)
+
+	Logger *slog.Logger
+
+	mutex sync.Mutex
+
 	initOnce sync.Once
 	initErr  error
 
@@ -107,18 +113,56 @@ type RoundTripper struct {
 }
 
 var (
-	_ http.RoundTripper = &RoundTripper{}
+	_ http.RoundTripper = &Transport{}
-	_ io.Closer         = &RoundTripper{}
+	_ io.Closer         = &Transport{}
 )
 
-// ErrNoCachedConn is returned when RoundTripper.OnlyCachedConn is set
+// Deprecated: RoundTripper was renamed to Transport.
+type RoundTripper = Transport
+
+// ErrNoCachedConn is returned when Transport.OnlyCachedConn is set
 var ErrNoCachedConn = errors.New("http3: no cached connection was available")
 
+func (t *Transport) init() error {
+	if t.newClient == nil {
+		t.newClient = func(conn quic.EarlyConnection) singleRoundTripper {
+			return newClientConn(
+				conn,
+				t.EnableDatagrams,
+				t.AdditionalSettings,
+				t.StreamHijacker,
+				t.UniStreamHijacker,
+				t.MaxResponseHeaderBytes,
+				t.DisableCompression,
+				t.Logger,
+			)
+		}
+	}
+	if t.QUICConfig == nil {
+		t.QUICConfig = defaultQuicConfig.Clone()
+		t.QUICConfig.EnableDatagrams = t.EnableDatagrams
+	}
+	if t.EnableDatagrams && !t.QUICConfig.EnableDatagrams {
+		return errors.New("HTTP Datagrams enabled, but QUIC Datagrams disabled")
+	}
+	if len(t.QUICConfig.Versions) == 0 {
+		t.QUICConfig = t.QUICConfig.Clone()
+		t.QUICConfig.Versions = []quic.Version{protocol.SupportedVersions[0]}
+	}
+	if len(t.QUICConfig.Versions) != 1 {
+		return errors.New("can only use a single QUIC version for dialing a HTTP/3 connection")
+	}
+	if t.QUICConfig.MaxIncomingStreams == 0 {
+		t.QUICConfig.MaxIncomingStreams = -1 // don't allow any bidirectional streams
+	}
+	return nil
+}
+
 // RoundTripOpt is like RoundTrip, but takes options.
-func (r *RoundTripper) RoundTripOpt(req *http.Request, opt RoundTripOpt) (*http.Response, error) {
+func (t *Transport) RoundTripOpt(req *http.Request, opt RoundTripOpt) (*http.Response, error) {
-	r.initOnce.Do(func() { r.initErr = r.init() })
+	t.initOnce.Do(func() { t.initErr = t.init() })
-	if r.initErr != nil {
+	if t.initErr != nil {
-		return nil, r.initErr
+		return nil, t.initErr
 	}
 
 	if req.URL == nil {
@@ -154,7 +198,7 @@ func (r *RoundTripper) RoundTripOpt(req *http.Request, opt RoundTripOpt) (*http.
 	}
 
 	hostname := authorityAddr(hostnameFromURL(req.URL))
-	cl, isReused, err := r.getClient(req.Context(), hostname, opt.OnlyCachedConn)
+	cl, isReused, err := t.getClient(req.Context(), hostname, opt.OnlyCachedConn)
 	if err != nil {
 		return nil, err
 	}
@@ -166,7 +210,7 @@ func (r *RoundTripper) RoundTripOpt(req *http.Request, opt RoundTripOpt) (*http.
 	}
 
 	if cl.dialErr != nil {
-		r.removeClient(hostname)
+		t.removeClient(hostname)
 		return nil, cl.dialErr
 	}
 	defer cl.useCount.Add(-1)
@@ -176,12 +220,12 @@ func (r *RoundTripper) RoundTripOpt(req *http.Request, opt RoundTripOpt) (*http.
 		// so we remove the client from the cache so that subsequent trips reconnect
 		// context cancelation is excluded as is does not signify a connection error
 		if !errors.Is(err, context.Canceled) {
-			r.removeClient(hostname)
+			t.removeClient(hostname)
 		}
 
 		if isReused {
 			if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
-				return r.RoundTripOpt(req, opt)
+				return t.RoundTripOpt(req, opt)
 			}
 		}
 	}
@@ -189,51 +233,19 @@ func (r *RoundTripper) RoundTripOpt(req *http.Request, opt RoundTripOpt) (*http.
 }
 
 // RoundTrip does a round trip.
-func (r *RoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
+func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error) {
-	return r.RoundTripOpt(req, RoundTripOpt{})
+	return t.RoundTripOpt(req, RoundTripOpt{})
 }
 
-func (r *RoundTripper) init() error {
+func (t *Transport) getClient(ctx context.Context, hostname string, onlyCached bool) (rtc *roundTripperWithCount, isReused bool, err error) {
-	if r.newClient == nil {
+	t.mutex.Lock()
-		r.newClient = func(conn quic.EarlyConnection) singleRoundTripper {
+	defer t.mutex.Unlock()
-			return &SingleDestinationRoundTripper{
-				Connection:             conn,
-				EnableDatagrams:        r.EnableDatagrams,
-				DisableCompression:     r.DisableCompression,
-				AdditionalSettings:     r.AdditionalSettings,
-				MaxResponseHeaderBytes: r.MaxResponseHeaderBytes,
-			}
-		}
-	}
-	if r.QUICConfig == nil {
-		r.QUICConfig = defaultQuicConfig.Clone()
-		r.QUICConfig.EnableDatagrams = r.EnableDatagrams
-	}
-	if r.EnableDatagrams && !r.QUICConfig.EnableDatagrams {
-		return errors.New("HTTP Datagrams enabled, but QUIC Datagrams disabled")
-	}
-	if len(r.QUICConfig.Versions) == 0 {
-		r.QUICConfig = r.QUICConfig.Clone()
-		r.QUICConfig.Versions = []quic.Version{protocol.SupportedVersions[0]}
-	}
-	if len(r.QUICConfig.Versions) != 1 {
-		return errors.New("can only use a single QUIC version for dialing a HTTP/3 connection")
-	}
-	if r.QUICConfig.MaxIncomingStreams == 0 {
-		r.QUICConfig.MaxIncomingStreams = -1 // don't allow any bidirectional streams
-	}
-	return nil
-}
 
-func (r *RoundTripper) getClient(ctx context.Context, hostname string, onlyCached bool) (rtc *roundTripperWithCount, isReused bool, err error) {
+	if t.clients == nil {
-	r.mutex.Lock()
+		t.clients = make(map[string]*roundTripperWithCount)
-	defer r.mutex.Unlock()
-
-	if r.clients == nil {
-		r.clients = make(map[string]*roundTripperWithCount)
 	}
 
-	cl, ok := r.clients[hostname]
+	cl, ok := t.clients[hostname]
 	if !ok {
 		if onlyCached {
 			return nil, false, ErrNoCachedConn
@@ -246,7 +258,7 @@ func (r *RoundTripper) getClient(ctx context.Context, hostname string, onlyCache
 		go func() {
 			defer close(cl.dialing)
 			defer cancel()
-			conn, rt, err := r.dial(ctx, hostname)
+			conn, rt, err := t.dial(ctx, hostname)
 			if err != nil {
 				cl.dialErr = err
 				return
@@ -254,12 +266,12 @@ func (r *RoundTripper) getClient(ctx context.Context, hostname string, onlyCache
 			cl.conn = conn
 			cl.rt = rt
 		}()
-		r.clients[hostname] = cl
+		t.clients[hostname] = cl
 	}
 	select {
 	case <-cl.dialing:
 		if cl.dialErr != nil {
-			delete(r.clients, hostname)
+			delete(t.clients, hostname)
 			return nil, false, cl.dialErr
 		}
 		select {
@@ -273,12 +285,12 @@ func (r *RoundTripper) getClient(ctx context.Context, hostname string, onlyCache
 	return cl, isReused, nil
 }
 
-func (r *RoundTripper) dial(ctx context.Context, hostname string) (quic.EarlyConnection, singleRoundTripper, error) {
+func (t *Transport) dial(ctx context.Context, hostname string) (quic.EarlyConnection, singleRoundTripper, error) {
 	var tlsConf *tls.Config
-	if r.TLSClientConfig == nil {
+	if t.TLSClientConfig == nil {
 		tlsConf = &tls.Config{}
 	} else {
-		tlsConf = r.TLSClientConfig.Clone()
+		tlsConf = t.TLSClientConfig.Clone()
 	}
 	if tlsConf.ServerName == "" {
 		sni, _, err := net.SplitHostPort(hostname)
@@ -289,61 +301,79 @@ func (r *RoundTripper) dial(ctx context.Context, hostname string) (quic.EarlyCon
 		tlsConf.ServerName = sni
 	}
 	// Replace existing ALPNs by H3
-	tlsConf.NextProtos = []string{versionToALPN(r.QUICConfig.Versions[0])}
+	tlsConf.NextProtos = []string{versionToALPN(t.QUICConfig.Versions[0])}
 
-	dial := r.Dial
+	dial := t.Dial
 	if dial == nil {
-		if r.transport == nil {
+		if t.transport == nil {
 			udpConn, err := net.ListenUDP("udp", nil)
 			if err != nil {
 				return nil, nil, err
 			}
-			r.transport = &quic.Transport{Conn: udpConn}
+			t.transport = &quic.Transport{Conn: udpConn}
 		}
 		dial = func(ctx context.Context, addr string, tlsCfg *tls.Config, cfg *quic.Config) (quic.EarlyConnection, error) {
 			udpAddr, err := net.ResolveUDPAddr("udp", addr)
 			if err != nil {
 				return nil, err
 			}
-			return r.transport.DialEarly(ctx, udpAddr, tlsCfg, cfg)
+			return t.transport.DialEarly(ctx, udpAddr, tlsCfg, cfg)
 		}
 	}
 
-	conn, err := dial(ctx, hostname, tlsConf, r.QUICConfig)
+	conn, err := dial(ctx, hostname, tlsConf, t.QUICConfig)
 	if err != nil {
 		return nil, nil, err
 	}
-	return conn, r.newClient(conn), nil
+	return conn, t.newClient(conn), nil
 }
 
-func (r *RoundTripper) removeClient(hostname string) {
+func (t *Transport) removeClient(hostname string) {
-	r.mutex.Lock()
+	t.mutex.Lock()
-	defer r.mutex.Unlock()
+	defer t.mutex.Unlock()
-	if r.clients == nil {
+	if t.clients == nil {
 		return
 	}
-	delete(r.clients, hostname)
+	delete(t.clients, hostname)
 }
 
-// Close closes the QUIC connections that this RoundTripper has used.
+// NewClientConn creates a new HTTP/3 client connection on top of a QUIC connection.
-// It also closes the underlying UDPConn if it is not nil.
+// Most users should use RoundTrip instead of creating a connection directly.
-func (r *RoundTripper) Close() error {
+// Specifically, it is not needed to perform GET, POST, HEAD and CONNECT requests.
-	r.mutex.Lock()
+//
-	defer r.mutex.Unlock()
+// Obtaining a ClientConn is only needed for more advanced use cases, such as
-	for _, cl := range r.clients {
+// using Extended CONNECT for WebTransport or the various MASQUE protocols.
+func (t *Transport) NewClientConn(conn quic.Connection) *ClientConn {
+	return newClientConn(
+		conn,
+		t.EnableDatagrams,
+		t.AdditionalSettings,
+		t.StreamHijacker,
+		t.UniStreamHijacker,
+		t.MaxResponseHeaderBytes,
+		t.DisableCompression,
+		t.Logger,
+	)
+}
+
+// Close closes the QUIC connections that this Transport has used.
+func (t *Transport) Close() error {
+	t.mutex.Lock()
+	defer t.mutex.Unlock()
+	for _, cl := range t.clients {
 		if err := cl.Close(); err != nil {
 			return err
 		}
 	}
-	r.clients = nil
+	t.clients = nil
-	if r.transport != nil {
+	if t.transport != nil {
-		if err := r.transport.Close(); err != nil {
+		if err := t.transport.Close(); err != nil {
 			return err
 		}
-		if err := r.transport.Conn.Close(); err != nil {
+		if err := t.transport.Conn.Close(); err != nil {
 			return err
 		}
-		r.transport = nil
+		t.transport = nil
 	}
 	return nil
 }
@@ -376,13 +406,17 @@ func isNotToken(r rune) bool {
 	return !httpguts.IsTokenRune(r)
 }
 
-func (r *RoundTripper) CloseIdleConnections() {
+// CloseIdleConnections closes any QUIC connections in the transport's pool that are currently idle.
-	r.mutex.Lock()
+// An idle connection is one that was previously used for requests but is now sitting unused.
-	defer r.mutex.Unlock()
+// This method does not interrupt any connections currently in use.
-	for hostname, cl := range r.clients {
+// It also does not affect connections obtained via NewClientConn.
+func (t *Transport) CloseIdleConnections() {
+	t.mutex.Lock()
+	defer t.mutex.Unlock()
+	for hostname, cl := range t.clients {
 		if cl.useCount.Load() == 0 {
 			cl.Close()
-			delete(r.clients, hostname)
+			delete(t.clients, hostname)
 		}
 	}
 }

vendor/github.com/quic-go/quic-go/internal/handshake/interface.go

@@ -83,6 +83,29 @@ const (
 	EventHandshakeComplete
 )
 
+func (k EventKind) String() string {
+	switch k {
+	case EventNoEvent:
+		return "EventNoEvent"
+	case EventWriteInitialData:
+		return "EventWriteInitialData"
+	case EventWriteHandshakeData:
+		return "EventWriteHandshakeData"
+	case EventReceivedReadKeys:
+		return "EventReceivedReadKeys"
+	case EventDiscard0RTTKeys:
+		return "EventDiscard0RTTKeys"
+	case EventReceivedTransportParameters:
+		return "EventReceivedTransportParameters"
+	case EventRestoredTransportParameters:
+		return "EventRestoredTransportParameters"
+	case EventHandshakeComplete:
+		return "EventHandshakeComplete"
+	default:
+		return "Unknown EventKind"
+	}
+}
+
 // Event is a handshake event.
 type Event struct {
 	Kind                EventKind

vendor/github.com/quic-go/quic-go/internal/utils/rtt_stats.go

@@ -27,11 +27,6 @@ type RTTStats struct {
 	maxAckDelay time.Duration
 }
 
-// NewRTTStats makes a properly initialized RTTStats object
-func NewRTTStats() *RTTStats {
-	return &RTTStats{}
-}
-
 // MinRTT Returns the minRTT for the entire connection.
 // May return Zero if no valid updates have occurred.
 func (r *RTTStats) MinRTT() time.Duration { return r.minRTT }
@@ -113,19 +108,3 @@ func (r *RTTStats) SetInitialRTT(t time.Duration) {
 	r.smoothedRTT = t
 	r.latestRTT = t
 }
-
-// OnConnectionMigration is called when connection migrates and rtt measurement needs to be reset.
-func (r *RTTStats) OnConnectionMigration() {
-	r.latestRTT = 0
-	r.minRTT = 0
-	r.smoothedRTT = 0
-	r.meanDeviation = 0
-}
-
-// ExpireSmoothedMetrics causes the smoothed_rtt to be increased to the latest_rtt if the latest_rtt
-// is larger. The mean deviation is increased to the most recent deviation if
-// it's larger.
-func (r *RTTStats) ExpireSmoothedMetrics() {
-	r.meanDeviation = max(r.meanDeviation, (r.smoothedRTT - r.latestRTT).Abs())
-	r.smoothedRTT = max(r.smoothedRTT, r.latestRTT)
-}

vendor/github.com/quic-go/quic-go/receive_stream.go

@@ -253,6 +253,9 @@ func (s *receiveStream) cancelReadImpl(errorCode qerr.StreamErrorCode) (queuedNe
 	if s.cancelledLocally { // duplicate call to CancelRead
 		return false
 	}
+	if s.closeForShutdownErr != nil {
+		return false
+	}
 	s.cancelledLocally = true
 	if s.errorRead || s.cancelledRemotely {
 		return false

vendor/github.com/quic-go/quic-go/send_stream.go

@@ -423,6 +423,10 @@ func (s *sendStream) CancelWrite(errorCode StreamErrorCode) {
 
 func (s *sendStream) cancelWriteImpl(errorCode qerr.StreamErrorCode, remote bool) {
 	s.mutex.Lock()
+	if s.closeForShutdownErr != nil {
+		s.mutex.Unlock()
+		return
+	}
 	if !remote {
 		s.cancellationFlagged = true
 		if s.cancelWriteErr != nil {

vendor/modules.txt

@@ -104,7 +104,7 @@ github.com/powerman/deepequal
 # github.com/quic-go/qpack v0.5.1
 ## explicit; go 1.22
 github.com/quic-go/qpack
-# github.com/quic-go/quic-go v0.47.0
+# github.com/quic-go/quic-go v0.48.1
 ## explicit; go 1.22
 github.com/quic-go/quic-go
 github.com/quic-go/quic-go/http3