diff --git a/akinet/http/parser.go b/akinet/http/parser.go
index 05f0d06..d887c2d 100644
--- a/akinet/http/parser.go
+++ b/akinet/http/parser.go
@@ -58,6 +58,13 @@ func (p *httpParser) Name() string {
 	return "HTTP/1.x Response Parser"
 }
 
+func (p *httpParser) ConnectionType() string {
+	if p.isRequest {
+		return akinet.CONNECTION_TYPE_HTTP_CLIENT
+	}
+	return akinet.CONNECTION_TYPE_HTTP_SERVER
+}
+
 func (p *httpParser) Parse(input memview.MemView, isEnd bool) (result akinet.ParsedNetworkContent, unused memview.MemView, totalBytesConsumed int64, err error) {
 	var consumedBytes int64
 	defer func() {
diff --git a/akinet/http2/parser_factory.go b/akinet/http2/parser_factory.go
index 5b2cb2c..62cc966 100644
--- a/akinet/http2/parser_factory.go
+++ b/akinet/http2/parser_factory.go
@@ -78,6 +78,10 @@ func (*http2Sink) Name() string {
 	return "HTTP/2 sink"
 }
 
+func (*http2Sink) ConnectionType() string {
+	return akinet.CONNECTION_TYPE_HTTP2_PREFACE
+}
+
 func (s *http2Sink) Parse(input memview.MemView, isEnd bool) (result akinet.ParsedNetworkContent, unused memview.MemView, totalBytesConsumed int64, err error) {
 	// Return one event at the start of the stream, so we can count it.
 	if s.firstInput {
diff --git a/akinet/net_traffic.go b/akinet/net_traffic.go
index 4882386..5bb05be 100644
--- a/akinet/net_traffic.go
+++ b/akinet/net_traffic.go
@@ -374,6 +374,30 @@ func (tls *TLSHandshakeMetadata) ApplicationLatencyMeasurable() bool {
 	return *tls.SelectedProtocol == "http/1.1"
 }
 
+// Represents the content when a TCP connection is closed by the client.
+type ClientShutdowntMetadata struct {
+	// StreamID and Seq uniquely identify a pair of request and response.
+	StreamID uuid.UUID
+	Seq      int
+}
+
+var _ ParsedNetworkContent = (*ClientShutdowntMetadata)(nil)
+
+func (ClientShutdowntMetadata) implParsedNetworkContent() {}
+func (ClientShutdowntMetadata) ReleaseBuffers()           {}
+
+// Represents the content when a TCP connection is closed by the server.
+type ServerShutdownMetadata struct {
+	// StreamID and Seq uniquely identify a pair of request and response.
+	StreamID uuid.UUID
+	Seq      int
+}
+
+var _ ParsedNetworkContent = (*ServerShutdownMetadata)(nil)
+
+func (ServerShutdownMetadata) implParsedNetworkContent() {}
+func (ServerShutdownMetadata) ReleaseBuffers()           {}
+
 // Represents an observed HTTP/2 connection preface; no data from it
 // is stored.
 type HTTP2ConnectionPreface struct {
diff --git a/akinet/tcp_parser.go b/akinet/tcp_parser.go
index 3b87553..f3237fd 100644
--- a/akinet/tcp_parser.go
+++ b/akinet/tcp_parser.go
@@ -14,6 +14,14 @@ const (
 	NeedMoreData
 )
 
+const (
+	CONNECTION_TYPE_HTTP_CLIENT   = "HTTP_CLIENT"
+	CONNECTION_TYPE_HTTP_SERVER   = "HTTP_SERVER"
+	CONNECTION_TYPE_TLS_CLIENT    = "TLS_CLIENT"
+	CONNECTION_TYPE_TLS_SERVER    = "TLS_SERVER"
+	CONNECTION_TYPE_HTTP2_PREFACE = "HTTP2_PREFACE"
+)
+
 func (d AcceptDecision) String() string {
 	switch d {
 	case Reject:
@@ -67,6 +75,8 @@ type TCPParserFactory interface {
 type TCPParser interface {
 	Name() string
 
+	ConnectionType() string
+
 	// Caller should repeatedly supply data from the TCP flow until a non-nil
 	// result or an error is returned.
 	//
@@ -93,16 +103,16 @@ type TCPParserFactorySelector []TCPParserFactory
 // SelectFactory selects a TCPParserFactory that suitable for input. The
 // possible set of return values:
 //   - f=nil, decision=Reject, discardFront=len(input)
-//       - no factory is suitable
+//   - no factory is suitable
 //   - f=nil, decision=NeedMoreData, discardFront>=0
-//       - no factory returned Accept
-//       - at least one factory requested more data
-//       - discardFront is the MIN of all the discardFronts returned by
-//         factories requesting more data
+//   - no factory returned Accept
+//   - at least one factory requested more data
+//   - discardFront is the MIN of all the discardFronts returned by
+//     factories requesting more data
 //   - f!=nil, decision=Accept, discardFront>=0
-//       - a factory has been selected
-//       - caller must discard discardFront number of bytes from input before
-//         feeding input to the parser generated by the factory.
+//   - a factory has been selected
+//   - caller must discard discardFront number of bytes from input before
+//     feeding input to the parser generated by the factory.
 func (s TCPParserFactorySelector) Select(input memview.MemView, isEnd bool) (f TCPParserFactory, decision AcceptDecision, discardFront int64) {
 	discardFront = -1
 	allReject := true
diff --git a/akinet/tls/client_parser.go b/akinet/tls/client_parser.go
index dff0b90..f8c3869 100644
--- a/akinet/tls/client_parser.go
+++ b/akinet/tls/client_parser.go
@@ -27,6 +27,10 @@ func (*tlsClientHelloParser) Name() string {
 	return "TLS 1.2/1.3 Client-Hello Parser"
 }
 
+func (*tlsClientHelloParser) ConnectionType() string {
+	return akinet.CONNECTION_TYPE_TLS_CLIENT
+}
+
 func (parser *tlsClientHelloParser) Parse(input memview.MemView, isEnd bool) (result akinet.ParsedNetworkContent, unused memview.MemView, totalBytesConsumed int64, err error) {
 	result, numBytesConsumed, err := parser.parse(input)
 	// It's an error if we're at the end and we don't yet have a result.
diff --git a/akinet/tls/server_parser.go b/akinet/tls/server_parser.go
index 4f6c97b..ef3f0f7 100644
--- a/akinet/tls/server_parser.go
+++ b/akinet/tls/server_parser.go
@@ -28,6 +28,10 @@ func (*tlsServerHelloParser) Name() string {
 	return "TLS 1.2/1.3 Server-Hello Parser"
 }
 
+func (*tlsServerHelloParser) ConnectionType() string {
+	return akinet.CONNECTION_TYPE_TLS_SERVER
+}
+
 func (parser *tlsServerHelloParser) Parse(input memview.MemView, isEnd bool) (result akinet.ParsedNetworkContent, unused memview.MemView, totalBytesConsumed int64, err error) {
 	result, numBytesConsumed, err := parser.parse(input)
 	// It's an error if we're at the end and we don't yet have a result.
diff --git a/go.mod b/go.mod
index c4c1373..a13759b 100644
--- a/go.mod
+++ b/go.mod
@@ -4,7 +4,7 @@ go 1.18
 
 require (
 	github.com/OneOfOne/xxhash v1.2.8
-	github.com/akitasoftware/akita-ir v0.0.0-20220630210013-8926783978fe
+	github.com/akitasoftware/akita-ir v0.0.0-20231103112405-e2221503d639 // todo: update this to match the commit on master once akita-ir#10 is merged
 	github.com/akitasoftware/go-utils v0.0.0-20221207014235-6f4c9079488d
 	github.com/akitasoftware/objecthash-proto v0.0.0-20211020004800-9990a7ea5dc0
 	github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883
diff --git a/go.sum b/go.sum
index b710b3b..e47ff78 100644
--- a/go.sum
+++ b/go.sum
@@ -2,6 +2,10 @@ github.com/OneOfOne/xxhash v1.2.8 h1:31czK/TI9sNkxIKfaUfGlU47BAxQ0ztGgd9vPyqimf8
 github.com/OneOfOne/xxhash v1.2.8/go.mod h1:eZbhyaAYD41SGSSsnmcpxVoRiQ/MPUTjUdIIOT9Um7Q=
 github.com/akitasoftware/akita-ir v0.0.0-20220630210013-8926783978fe h1:0BeBDjLDFPwv2bkk6YuRAPf1r6U4Wby98NHI9+Lddvs=
 github.com/akitasoftware/akita-ir v0.0.0-20220630210013-8926783978fe/go.mod h1:WEWPzhZtxlJnov3MxcqSDiZaHHf00vs3aJwCdt3OwzA=
+github.com/akitasoftware/akita-ir v0.0.0-20231102193917-8b96486d4377 h1:AaUu5pd9GnOZptkkhoFrWJUivv+2+s/zmKHVOGItsrg=
+github.com/akitasoftware/akita-ir v0.0.0-20231102193917-8b96486d4377/go.mod h1:WEWPzhZtxlJnov3MxcqSDiZaHHf00vs3aJwCdt3OwzA=
+github.com/akitasoftware/akita-ir v0.0.0-20231103112405-e2221503d639 h1:hIWGdk/RJGbvfLA2pODQLn8lAygHXEQLZN3VuIrkCHU=
+github.com/akitasoftware/akita-ir v0.0.0-20231103112405-e2221503d639/go.mod h1:WEWPzhZtxlJnov3MxcqSDiZaHHf00vs3aJwCdt3OwzA=
 github.com/akitasoftware/go-utils v0.0.0-20221207014235-6f4c9079488d h1:pN1dbNacZ/mvlU1NcJVDxqmKnrDQDTVaN6iKOarfdYM=
 github.com/akitasoftware/go-utils v0.0.0-20221207014235-6f4c9079488d/go.mod h1:+IOXf7l/QCAQECJzjJwhTp1sBkRoJ6WciZwJezUwBa4=
 github.com/akitasoftware/gopacket v1.1.18-0.20210730205736-879e93dac35b h1:toBhS5rhCjo/N4YZ1cYtlsdSTGjMFH+gbJGCc+OmZiY=
diff --git a/spec_util/ir_hash/gen/gen.go b/spec_util/ir_hash/gen/gen.go
index 573ba89..b5ed009 100644
--- a/spec_util/ir_hash/gen/gen.go
+++ b/spec_util/ir_hash/gen/gen.go
@@ -112,6 +112,7 @@ func main() {
 	gf.AddHashFunc(reflect.TypeOf(pb.HTTPHeader{}))
 	gf.AddHashFunc(reflect.TypeOf(pb.HTTPMeta{}))
 	gf.AddHashFunc(reflect.TypeOf(pb.HTTPMethodMeta{}))
+	gf.AddHashFunc(reflect.TypeOf(pb.HTTPMethodError{}))
 	gf.AddHashFunc(reflect.TypeOf(pb.HTTPMultipart{}))
 	gf.AddHashFunc(reflect.TypeOf(pb.HTTPPath{}))
 	gf.AddHashFunc(reflect.TypeOf(pb.HTTPQuery{}))
diff --git a/spec_util/ir_hash/generated_types.go b/spec_util/ir_hash/generated_types.go
index d8ee0cc..cb14011 100644
--- a/spec_util/ir_hash/generated_types.go
+++ b/spec_util/ir_hash/generated_types.go
@@ -369,6 +369,19 @@ func HashHTTPMethodMeta(node *pb.HTTPMethodMeta) []byte {
 	}
 	return hash.Sum(nil)
 }
+func HashHTTPMethodError(node *pb.HTTPMethodError) []byte {
+	hash := xxhash.New64()
+	hash.Write([]byte("d"))
+	if node.Type != 0 {
+		hash.Write(intHashes[1])
+		hash.Write(Hash_Int32(int32(node.Type)))
+	}
+	if node.Message != "" {
+		hash.Write(intHashes[2])
+		hash.Write(Hash_Unicode(node.Message))
+	}
+	return hash.Sum(nil)
+}
 func HashHTTPMultipart(node *pb.HTTPMultipart) []byte {
 	hash := xxhash.New64()
 	hash.Write([]byte("d"))
@@ -621,6 +634,15 @@ func HashMethodMeta(node *pb.MethodMeta) []byte {
 		hash.Write(intHashes[2])
 		hash.Write(HashHTTPMethodMeta(val.Http))
 	}
+	if len(node.Errors) != 0 {
+		hash.Write(intHashes[3])
+		listHash := xxhash.New64()
+		listHash.Write([]byte("l"))
+		for _, v := range node.Errors {
+			listHash.Write(HashHTTPMethodError(v))
+		}
+		hash.Write(listHash.Sum(nil))
+	}
 	return hash.Sum(nil)
 }
 func HashNone(node *pb.None) []byte {
@@ -897,4 +919,4 @@ func HashWitness(node *pb.Witness) []byte {
 	return hash.Sum(nil)
 }
 
-var ProtobufFileHashes map[string][]byte = map[string][]byte{"method.proto": []byte{69, 16, 236, 176, 97, 180, 164, 70}, "witness.proto": []byte{42, 213, 185, 25, 124, 226, 76, 187}, "types.proto": []byte{98, 84, 34, 180, 249, 140, 214, 227}, "spec.proto": []byte{13, 101, 129, 126, 232, 252, 1, 146}}
+var ProtobufFileHashes map[string][]byte = map[string][]byte{"method.proto": []byte{177, 245, 189, 217, 244, 231, 2, 63}, "witness.proto": []byte{42, 213, 185, 25, 124, 226, 76, 187}, "types.proto": []byte{98, 84, 34, 180, 249, 140, 214, 227}, "spec.proto": []byte{13, 101, 129, 126, 232, 252, 1, 146}}