close the connection when encountering an error on the header stream

fixes #403

h2quic/server.go

@@ -112,6 +112,7 @@ func (s *Server) handleStream(session streamCreator, stream utils.Stream) {
 				if _, ok := err.(*qerr.QuicError); !ok {
 					utils.Errorf("error handling h2 request: %s", err.Error())
 				}
+				session.Close(qerr.Error(qerr.InvalidHeadersStreamData, err.Error()))
 				return
 			}
 		}

h2quic/server_test.go

@@ -1,6 +1,7 @@
 package h2quic
 
 import (
+	"bytes"
 	"net"
 	"net/http"
 	"os"
@@ -12,6 +13,7 @@ import (
 	"golang.org/x/net/http2/hpack"
 
 	"github.com/lucas-clemente/quic-go/protocol"
+	"github.com/lucas-clemente/quic-go/qerr"
 	"github.com/lucas-clemente/quic-go/testdata"
 	"github.com/lucas-clemente/quic-go/utils"
 
@@ -21,13 +23,18 @@ import (
 
 type mockSession struct {
 	closed          bool
+	closedWithError error
 	dataStream      *mockStream
 }
 
 func (s *mockSession) GetOrOpenStream(id protocol.StreamID) (utils.Stream, error) {
 	return s.dataStream, nil
 }
-func (s *mockSession) Close(error) error { s.closed = true; return nil }
+func (s *mockSession) Close(e error) error {
+	s.closed = true
+	s.closedWithError = e
+	return nil
+}
 func (s *mockSession) RemoteAddr() *net.UDPAddr {
 	return &net.UDPAddr{IP: []byte{127, 0, 0, 1}, Port: 42}
 }
@@ -190,6 +197,19 @@ var _ = Describe("H2 server", func() {
 		Eventually(func() bool { return handlerCalled }).Should(BeTrue())
 	})
 
+	It("closes the connection if it encounters an error on the header stream", func() {
+		var handlerCalled bool
+		s.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			handlerCalled = true
+		})
+		headerStream := &mockStream{id: 3}
+		headerStream.dataToRead.Write(bytes.Repeat([]byte{0}, 100))
+		s.handleStream(session, headerStream)
+		Consistently(func() bool { return handlerCalled }).Should(BeFalse())
+		Eventually(func() bool { return session.closed }).Should(BeTrue())
+		Expect(session.closedWithError).To(MatchError(qerr.Error(qerr.InvalidHeadersStreamData, "connection error: PROTOCOL_ERROR")))
+	})
+
 	It("ignores other streams", func() {
 		var handlerCalled bool
 		s.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {