diff --git a/api/errcode.proto b/api/errcode.proto
index 59a98446e..a1f1126a1 100644
--- a/api/errcode.proto
+++ b/api/errcode.proto
@@ -162,6 +162,7 @@ enum ErrCode {
   ErrConfigureDB = 6013;
   ErrInitSSOClient = 6014;
   ErrInitService = 6015;
+  ErrInitTracer = 6016;
 
   //// Pathwar Agent (starting at 7001)
 
diff --git a/docs/gen.sum b/docs/gen.sum
index e1991d846..18854ca03 100644
--- a/docs/gen.sum
+++ b/docs/gen.sum
@@ -1,8 +1,8 @@
-41c0e4276e1c586be7786abcf014d23c0137a978  ../api/errcode.proto
 4362a2715e8c2053c4bec93585b01ca252dae2e7  ../api/pwagent.proto
 70d67f1cebb3b7f9e86fd0197d43db4c1f795f65  ../api/pwinit.proto
 a45fa08c595709dd752f52ded4493ceb3a191de2  ../api/pwcompose.proto
 aa91d470259d4575fd1c2b2d340d32996e9992e1  ../api/pwdb.proto
 bad04556b7233d5c8ddbcc1a3b2bfd027b694bce  ../api/pwsso.proto
 bdee305a46e55de7e3feea7cc54ff3a268e81651  ../api/pwapi.proto
+d8879301fa7e69c62e2c5be32bc5103584e7e504  ../api/errcode.proto
 e954302d8badf46e34c0931d40593606e8e06245  Makefile
diff --git a/go.mod b/go.mod
index fd189045a..13b43a57a 100644
--- a/go.mod
+++ b/go.mod
@@ -29,6 +29,9 @@ require (
 	github.com/oklog/run v1.0.0
 	github.com/olekukonko/tablewriter v0.0.4
 	github.com/opencontainers/go-digest v1.0.0-rc1 // indirect
+	github.com/opentracing/opentracing-go v1.1.0
+	github.com/openzipkin-contrib/zipkin-go-opentracing v0.4.5
+	github.com/openzipkin/zipkin-go v0.2.1
 	github.com/peterbourgon/ff v1.7.0
 	github.com/pkg/errors v0.8.1
 	github.com/rogpeppe/go-internal v1.5.1 // indirect
diff --git a/go.sum b/go.sum
index 44eba8a22..483d19f9f 100644
--- a/go.sum
+++ b/go.sum
@@ -50,6 +50,7 @@ github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25Kn
 github.com/eapache/go-resiliency v1.1.0/go.mod h1:kFI+JgMyC7bLPUVY133qvEBtVayf5mFgVsvEsIPBvNs=
 github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21/go.mod h1:+020luEh2TKB4/GOp8oxxtq0Daoen/Cii55CzbTV6DU=
 github.com/eapache/queue v1.1.0/go.mod h1:6eCeP0CKFpHLu8blIFXhExK/dRa7WDZfr6jVFPTqq+I=
+github.com/envoyproxy/go-control-plane v0.6.9/go.mod h1:SBwIajubJHhxtWwsL9s8ss4safvEdbitLhGGK48rN6g=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/erikstmartin/go-testdb v0.0.0-20160219214506-8d10e4a1bae5 h1:Yzb9+7DPaBjB8zlTR87/ElzFsnQfuHnVUVqpZZIcV5Y=
@@ -79,6 +80,7 @@ github.com/gofrs/uuid v3.2.0+incompatible h1:y12jRkkFxsd7GpqdSZ+/KCs/fJbqpEXSGd4
 github.com/gofrs/uuid v3.2.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
 github.com/gogo/gateway v1.1.0 h1:u0SuhL9+Il+UbjM9VIE3ntfRujKbvVpFvNB4HbjeVQ0=
 github.com/gogo/gateway v1.1.0/go.mod h1:S7rR8FRQyG3QFESeSv4l2WnsyzlCLG0CzBbUUo/mbic=
+github.com/gogo/googleapis v1.1.0/go.mod h1:gf4bu3Q80BeJ6H1S1vYPm8/ELATdvryBaNFGgqEef3s=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.2.0/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
@@ -102,8 +104,12 @@ github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXi
 github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
+github.com/gorilla/context v1.1.1 h1:AWwleXJkX/nhcU9bZSnZoi3h/qGYqQAGhq6zZe/aQW8=
 github.com/gorilla/context v1.1.1/go.mod h1:kBGZzfjB9CEq2AlWe17Uuf7NDRt0dE0s8S51q0aT7Yg=
+github.com/gorilla/mux v1.6.2 h1:Pgr17XVTNXAk3q/r4CpKzC5xBM/qW1uVLV+IhRZpIIk=
 github.com/gorilla/mux v1.6.2/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
+github.com/gorilla/mux v1.7.3 h1:gnP5JzjVOuiZD07fKKToCAOjS0yOpj/qPETTXCCS6hw=
+github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
 github.com/grpc-ecosystem/go-grpc-middleware v1.1.0 h1:THDBEeQ9xZ8JEaCLyLQqXMMdRqNr0QAUJTIkQAUtFjg=
 github.com/grpc-ecosystem/go-grpc-middleware v1.1.0/go.mod h1:f5nM7jw/oeRSadq3xCzHAvxcr8HZnzsqU6ILg/0NiiE=
 github.com/grpc-ecosystem/grpc-gateway v1.8.5/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
@@ -143,6 +149,7 @@ github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/lib/pq v1.0.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/lib/pq v1.1.1 h1:sJZmqHoEaY7f+NPP8pgLB/WxulyR3fewgCM2qaSlBb4=
 github.com/lib/pq v1.1.1/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
+github.com/lyft/protoc-gen-validate v0.0.13/go.mod h1:XbGvPuh87YZc5TdIa2/I4pLk0QoUACkjt2znoq26NVQ=
 github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/martinlindhe/base36 v1.0.0 h1:eYsumTah144C0A8P1T/AVSUk5ZoLnhfYFM3OGQxB52A=
 github.com/martinlindhe/base36 v1.0.0/go.mod h1:+AtEs8xrBpCeYgSLoY/aJ6Wf37jtBuR0s35750M27+8=
@@ -167,17 +174,27 @@ github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+W
 github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
 github.com/opencontainers/go-digest v1.0.0-rc1 h1:WzifXhOVOEOuFYOJAW6aQqW0TooG2iki3E3Ii+WN7gQ=
 github.com/opencontainers/go-digest v1.0.0-rc1/go.mod h1:cMLVZDEM3+U2I4VmLI6N8jQYUd2OVphdqWwCJHrFt2s=
+github.com/opentracing-contrib/go-observer v0.0.0-20170622124052-a52f23424492 h1:lM6RxxfUMrYL/f8bWEUqdXrANWtrL7Nndbm9iFN0DlU=
+github.com/opentracing-contrib/go-observer v0.0.0-20170622124052-a52f23424492/go.mod h1:Ngi6UdF0k5OKD5t5wlmGhe/EDKPoUM3BXZSSfIuJbis=
+github.com/opentracing/opentracing-go v1.1.0 h1:pWlfV3Bxv7k65HYwkikxat0+s3pV4bsqf19k25Ur8rU=
 github.com/opentracing/opentracing-go v1.1.0/go.mod h1:UkNAQd3GIcIGf0SeVgPpRdFStlNbqXla1AfSYxPUl2o=
+github.com/openzipkin-contrib/zipkin-go-opentracing v0.4.5 h1:ZCnq+JUrvXcDVhX/xRolRBZifmabN1HcS1wrPSvxhrU=
+github.com/openzipkin-contrib/zipkin-go-opentracing v0.4.5/go.mod h1:/wsWhb9smxSfWAKL3wpBW7V8scJMt8N8gnaMCS9E/cA=
+github.com/openzipkin/zipkin-go v0.1.6 h1:yXiysv1CSK7Q5yjGy1710zZGnsbMUIjluWBxtLXHPBo=
 github.com/openzipkin/zipkin-go v0.1.6/go.mod h1:QgAqvLzwWbR/WpD4A3cGpPtJrZXNIiJc5AZX7/PBEpw=
+github.com/openzipkin/zipkin-go v0.2.1 h1:noL5/5Uf1HpVl3wNsfkZhIKbSWCVi5jgqkONNx8PXcA=
+github.com/openzipkin/zipkin-go v0.2.1/go.mod h1:NaW6tEwdmWMaCDZzg8sh+IBNOxHMPnhQw8ySjnjRyN4=
 github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
 github.com/pelletier/go-toml v1.6.0/go.mod h1:5N711Q9dKgbdkxHL+MEfF31hpT7l0S0s/t2kKREewys=
 github.com/peterbourgon/ff v1.7.0 h1:hknvTgsh90jNBIjPq7xeq32Y9AmSbpXvjrFW4sJwW+A=
 github.com/peterbourgon/ff v1.7.0/go.mod h1:/KKxnU5cBj4w21jEMj4Rway/kslRP6XAOHh7CH8AyAM=
+github.com/pierrec/lz4 v1.0.2-0.20190131084431-473cd7ce01a1/go.mod h1:3/3N9NVKO0jef7pBehbT1qWhCMrIgbYNnFAZCqQ5LRc=
 github.com/pierrec/lz4 v2.0.5+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
 github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/profile v1.2.1/go.mod h1:hJw3o1OdXxsrSjjVksARp5W95eeEaEfptyVZyv6JUPA=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
@@ -213,6 +230,7 @@ github.com/spf13/cobra v0.0.5/go.mod h1:3K3wKZymM7VvHMDS9+Akkh4K60UwM26emMESw8tL
 github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb68N+wFjFa4jdeBTo=
 github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
 github.com/spf13/viper v1.3.2/go.mod h1:ZiWeW+zYFKm7srdB9IoDzzZXaJaI5eL9QjNiN/DMA2s=
+github.com/streadway/amqp v0.0.0-20190404075320-75d898a42a94/go.mod h1:AZpEONHx3DKn8O/DFsRAY58/XVQiIPMTMB1SddzLXVw=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1 h1:2vfRuCMp5sSVIDSqO8oNnWJq7mPa6KVP3iPIwFBuy8A=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -350,6 +368,8 @@ google.golang.org/genproto v0.0.0-20191230161307-f3c370f40bfb/go.mod h1:n3cpQtvx
 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.19.1/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.20.0/go.mod h1:chYK+tFQF0nDUGJgXMSgLCQk3phJEuONr2DCgLDdAQM=
+google.golang.org/grpc v1.22.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.24.0 h1:vb/1TCsVn3DcJlQ0Gs1yB1pKI6Do2/QNwxdKqmc/b0s=
 google.golang.org/grpc v1.24.0/go.mod h1:XDChyiUovWa60DnaeDeZmSW86xtLtjtZbwvSiRnRtcA=
diff --git a/go/Makefile b/go/Makefile
index 45aca02e1..0145b239d 100644
--- a/go/Makefile
+++ b/go/Makefile
@@ -25,10 +25,6 @@ include ../rules.mk  # see https://github.com/moul/rules.mk
 	mkdir -p out
 	GOOS=linux GOARCH=amd64 $(GO) build -mod=readonly -o $@ ./cmd/pwinit
 
-##
-## mysql
-##
-
 MYSQL_CONFIG ?=	-h127.0.0.1 -P3306 -uroot -puns3cur3
 
 .PHONY: up
@@ -57,7 +53,7 @@ mysql.down:
 
 .PHONY: mysql.logs
 mysql.logs:
-	docker-compose logs -f mysql
+	docker-compose logs --tail=1000 -f mysql
 
 .PHONY: mysql.shell
 mysql.shell:
@@ -67,9 +63,18 @@ mysql.shell:
 mysql.dump:
 	mysqldump $(MYSQL_CONFIG) pathwar
 
-.PHONY: packr
-packr:
-	cd pkg/pwinit && packr2
+.PHONY: zipkin.up
+zipkin.up:
+	docker-compose $(COMPOSE_OPTS) up -d zipkin
+
+.PHONY: zipkin.logs
+zipkin.logs:
+	docker-compose $(COMPOSE_OPTS) logs --tail=1000 -f zipkin
+
+.PHONY: zipkin.down
+zipkin.down:
+	docker-compose $(COMPOSE_OPTS) stop zipkin || true
+	docker-compose $(COMPOSE_OPTS) rm -f -v zipkin || true
 
 ##
 ## generate
@@ -110,3 +115,7 @@ generate_local:
 .PHONY: clean
 clean:
 	rm -f gen.sum $(wildcard */*/*.pb.go */*/*.pb.gw.go) $(wildcard out/*) $(wildcard */*/packrd/*) $(wildcard */*/*-packr.go)
+
+.PHONY: packr
+packr:
+	cd pkg/pwinit && packr2
diff --git a/go/cmd/pathwar/main.go b/go/cmd/pathwar/main.go
index 223dc46e5..04bc3dd14 100644
--- a/go/cmd/pathwar/main.go
+++ b/go/cmd/pathwar/main.go
@@ -20,6 +20,11 @@ import (
 	_ "github.com/go-sql-driver/mysql" // required by gorm
 	"github.com/jinzhu/gorm"
 	"github.com/oklog/run"
+	opentracing "github.com/opentracing/opentracing-go"
+	zipkinot "github.com/openzipkin-contrib/zipkin-go-opentracing"
+	zipkin "github.com/openzipkin/zipkin-go"
+	"github.com/openzipkin/zipkin-go/model"
+	reporterhttp "github.com/openzipkin/zipkin-go/reporter/http"
 	"github.com/peterbourgon/ff"
 	"github.com/peterbourgon/ff/ffcli"
 	"go.uber.org/zap"
@@ -51,7 +56,9 @@ const (
 )
 
 var (
-	logger     *zap.Logger
+	logger *zap.Logger
+	tracer opentracing.Tracer
+
 	flagOutput = os.Stderr
 
 	// flag vars
@@ -86,6 +93,7 @@ var (
 	composeUpForceRecreate   bool
 	composeUpInstanceKey     string
 	httpAPIAddr              string
+	zipkinEndpoint           string
 	serverBind               string
 	serverCORSAllowedOrigins string
 	serverRequestTimeout     time.Duration
@@ -128,6 +136,7 @@ func main() {
 	)
 	globalFlags.SetOutput(flagOutput) // used in main_test.go
 	globalFlags.BoolVar(&globalDebug, "debug", false, "debug mode")
+	globalFlags.StringVar(&zipkinEndpoint, "zipkin-endpoint", "", "optional opentracing server")
 	globalFlags.StringVar(&bearerSecretKey, "bearer-secretkey", "", "bearer.sh secret key")
 
 	agentFlags.BoolVar(&agentClean, "clean", false, "remove all pathwar instances before executing")
@@ -238,6 +247,7 @@ func main() {
 						RequestTimeout:     serverRequestTimeout,
 						ShutdownTimeout:    serverShutdownTimeout,
 						WithPprof:          serverWithPprof,
+						Tracer:             tracer,
 					}
 					var err error
 					server, err = pwapi.NewServer(ctx, svc, opts)
@@ -790,6 +800,24 @@ func globalPreRun() error {
 			return errcode.ErrInitLogger.Wrap(err)
 		}
 	}
+	if zipkinEndpoint != "" {
+		reporter := reporterhttp.NewReporter(zipkinEndpoint)
+		localEndpoint := &model.Endpoint{ServiceName: "pathwar"}
+		sampler, err := zipkin.NewCountingSampler(1)
+		if err != nil {
+			return errcode.ErrInitTracer.Wrap(err)
+		}
+		nativeTracer, err := zipkin.NewTracer(
+			reporter,
+			zipkin.WithSampler(sampler),
+			zipkin.WithLocalEndpoint(localEndpoint),
+		)
+		if err != nil {
+			return errcode.ErrInitTracer.Wrap(err)
+		}
+		tracer = zipkinot.Wrap(nativeTracer)
+		opentracing.SetGlobalTracer(tracer)
+	}
 	return nil
 }
 
diff --git a/go/cmd/pathwar/main_test.go b/go/cmd/pathwar/main_test.go
index 44f6010d0..b8ccfc1db 100644
--- a/go/cmd/pathwar/main_test.go
+++ b/go/cmd/pathwar/main_test.go
@@ -24,4 +24,5 @@ func Example() {
 	// FLAGS
 	//   -bearer-secretkey ...  bearer.sh secret key
 	//   -debug false           debug mode
+	//   -zipkin-endpoint ...   optional opentracing server
 }
diff --git a/go/docker-compose.dev.yml b/go/docker-compose.dev.yml
index 65000e1e8..77f431bda 100644
--- a/go/docker-compose.dev.yml
+++ b/go/docker-compose.dev.yml
@@ -8,3 +8,7 @@ services:
   mysql:
     ports:
       - 3306:3306
+
+  zipkin:
+    ports:
+      - 9411:9411
diff --git a/go/docker-compose.yml b/go/docker-compose.yml
index 7cc068942..cdb41c997 100644
--- a/go/docker-compose.yml
+++ b/go/docker-compose.yml
@@ -38,6 +38,11 @@ services:
       MYSQL_USER: pathwar
       MYSQL_PASSWORD: uns3cur3
 
+  zipkin:
+    image: openzipkin/zipkin-slim:latest
+    ports:
+      - 9411
+
   mailserver:
     image: mailhog/mailhog
     restart: unless-stopped
diff --git a/go/gen.sum b/go/gen.sum
index b0328913c..db43e00a6 100644
--- a/go/gen.sum
+++ b/go/gen.sum
@@ -1,8 +1,8 @@
-41c0e4276e1c586be7786abcf014d23c0137a978  ../api/errcode.proto
+1da371a47e1149b84deb469bac7d090adb33485d  Makefile
 4362a2715e8c2053c4bec93585b01ca252dae2e7  ../api/pwagent.proto
 70d67f1cebb3b7f9e86fd0197d43db4c1f795f65  ../api/pwinit.proto
-8309c2fcf3f5ddcce75ec1491164562c3615b73c  Makefile
 a45fa08c595709dd752f52ded4493ceb3a191de2  ../api/pwcompose.proto
 aa91d470259d4575fd1c2b2d340d32996e9992e1  ../api/pwdb.proto
 bad04556b7233d5c8ddbcc1a3b2bfd027b694bce  ../api/pwsso.proto
 bdee305a46e55de7e3feea7cc54ff3a268e81651  ../api/pwapi.proto
+d8879301fa7e69c62e2c5be32bc5103584e7e504  ../api/errcode.proto
diff --git a/go/pkg/errcode/errcode.pb.go b/go/pkg/errcode/errcode.pb.go
index 105f95c89..6c82a8a83 100644
--- a/go/pkg/errcode/errcode.pb.go
+++ b/go/pkg/errcode/errcode.pb.go
@@ -158,6 +158,7 @@ const (
 	ErrConfigureDB                          ErrCode = 6013
 	ErrInitSSOClient                        ErrCode = 6014
 	ErrInitService                          ErrCode = 6015
+	ErrInitTracer                           ErrCode = 6016
 	ErrAgentGetContainersInfo               ErrCode = 7001
 	ErrCheckNginxContainer                  ErrCode = 7002
 	ErrRemoveNginxContainer                 ErrCode = 7003
@@ -338,6 +339,7 @@ var ErrCode_name = map[int32]string{
 	6013:  "ErrConfigureDB",
 	6014:  "ErrInitSSOClient",
 	6015:  "ErrInitService",
+	6016:  "ErrInitTracer",
 	7001:  "ErrAgentGetContainersInfo",
 	7002:  "ErrCheckNginxContainer",
 	7003:  "ErrRemoveNginxContainer",
@@ -518,6 +520,7 @@ var ErrCode_value = map[string]int32{
 	"ErrConfigureDB":                          6013,
 	"ErrInitSSOClient":                        6014,
 	"ErrInitService":                          6015,
+	"ErrInitTracer":                           6016,
 	"ErrAgentGetContainersInfo":               7001,
 	"ErrCheckNginxContainer":                  7002,
 	"ErrRemoveNginxContainer":                 7003,
@@ -579,144 +582,145 @@ func init() {
 func init() { proto.RegisterFile("errcode.proto", fileDescriptor_4240057316120df7) }
 
 var fileDescriptor_4240057316120df7 = []byte{
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+	0x14, 0x59, 0x26, 0x62, 0x38, 0xe1, 0x99, 0x2b, 0xc1, 0x68, 0x54, 0x55, 0xf3, 0x7d, 0x45, 0xad,
+	0x09, 0x27, 0x6d, 0xd5, 0xd5, 0x7b, 0x84, 0x86, 0xe3, 0xbe, 0x2f, 0x30, 0x8e, 0x9b, 0x5c, 0xde,
+	0x8b, 0x82, 0x76, 0x54, 0x59, 0x9e, 0xca, 0xa9, 0xd6, 0xb0, 0x43, 0x92, 0xd0, 0x96, 0xf1, 0x69,
+	0xaf, 0x7f, 0x51, 0xf5, 0x68, 0xda, 0x51, 0x82, 0xb0, 0x98, 0xb4, 0x35, 0x3a, 0x67, 0x8a, 0xc8,
+	0x8d, 0xb7, 0x25, 0x5d, 0x42, 0xa3, 0xfa, 0x94, 0xed, 0x28, 0x3b, 0x1d, 0xd3, 0xa9, 0xb9, 0x17,
+	0x25, 0xf1, 0x89, 0x24, 0x70, 0xd6, 0x86, 0xde, 0xe4, 0x1a, 0x96, 0x19, 0xc1, 0x97, 0xa8, 0x8f,
+	0x3e, 0x9c, 0xcb, 0x95, 0x99, 0xe6, 0xec, 0xa3, 0xb2, 0x6b, 0x30, 0x3f, 0x6f, 0x3d, 0x35, 0x4a,
+	0x0d, 0x66, 0x87, 0xf1, 0x85, 0x7c, 0x83, 0xa6, 0x81, 0xab, 0x5c, 0x69, 0x29, 0xb8, 0x98, 0x9b,
+	0x0a, 0x39, 0xa6, 0xd5, 0x7d, 0xda, 0x8e, 0xc5, 0x29, 0x94, 0xf9, 0x18, 0xf6, 0x62, 0x6f, 0x01,
+	0x45, 0xdc, 0xa5, 0x11, 0x3c, 0x93, 0x33, 0xaf, 0x6d, 0xe6, 0xf5, 0x9f, 0xb5, 0xa1, 0x0e, 0x8e,
+	0x3f, 0x7d, 0x59, 0xf9, 0xf0, 0x5c, 0xae, 0x56, 0xc7, 0x03, 0xb5, 0x51, 0x3e, 0x6f, 0x27, 0x46,
+	0x8b, 0x2c, 0x61, 0x4a, 0x7a, 0xc1, 0x1a, 0xd9, 0x43, 0xe3, 0xfe, 0xe4, 0x6d, 0xb0, 0x58, 0x12,
+	0xd6, 0xc6, 0x18, 0x5e, 0xb4, 0xe5, 0xd6, 0x3f, 0xc4, 0xf7, 0xe1, 0x25, 0xcf, 0xfd, 0x8c, 0x73,
+	0xb7, 0x4e, 0x50, 0x12, 0x65, 0x3d, 0x6d, 0xe6, 0x35, 0xfa, 0xd5, 0xd5, 0x16, 0xe9, 0xa5, 0x55,
+	0x7e, 0xc9, 0xde, 0x1b, 0xa9, 0x64, 0x7d, 0x25, 0xa2, 0x02, 0x7d, 0x78, 0xd9, 0xcb, 0xb6, 0x1e,
+	0x45, 0xce, 0xb6, 0xbd, 0x57, 0x6c, 0xd1, 0xa8, 0x9c, 0xd7, 0x38, 0xaa, 0x82, 0xa9, 0x62, 0xc8,
+	0x59, 0x30, 0xa7, 0x47, 0x23, 0x5c, 0xee, 0x4f, 0x38, 0xb1, 0x84, 0xda, 0x6b, 0x64, 0x70, 0xff,
+	0x2e, 0xbb, 0x49, 0x6b, 0xea, 0x2c, 0x06, 0x8a, 0x2e, 0xa6, 0x88, 0xc4, 0x65, 0xb2, 0x0a, 0x5f,
+	0xdf, 0x65, 0x0a, 0x57, 0x5d, 0x5e, 0x7b, 0x78, 0x10, 0xa0, 0x80, 0xf7, 0xca, 0xd6, 0x90, 0x24,
+	0x42, 0x2a, 0x3d, 0xda, 0x46, 0x78, 0xbf, 0x9c, 0x93, 0x4c, 0x8d, 0xc1, 0x07, 0x65, 0x3b, 0x99,
+	0x04, 0x4f, 0xa2, 0x39, 0x14, 0x3d, 0xca, 0xf4, 0xfb, 0xe2, 0xc3, 0x72, 0x2e, 0xbf, 0xad, 0xe9,
+	0x74, 0x6d, 0x57, 0x19, 0x9a, 0x0c, 0x49, 0x10, 0xc3, 0x5f, 0xec, 0x09, 0xb5, 0xa4, 0x17, 0x65,
+	0xbd, 0xf7, 0xd7, 0x72, 0x7f, 0x6a, 0xab, 0x1d, 0xbb, 0xc3, 0xe1, 0x6f, 0xe5, 0x7e, 0x4b, 0xb7,
+	0x5a, 0xd3, 0xfb, 0xba, 0x9c, 0xf4, 0x28, 0x7c, 0x54, 0xa4, 0x9a, 0x37, 0xc3, 0xdf, 0x8b, 0x54,
+	0x53, 0xa0, 0xff, 0x28, 0x9b, 0x02, 0x55, 0x6e, 0xd7, 0x78, 0x7b, 0x11, 0x85, 0x79, 0x44, 0xfc,
+	0xb3, 0x6c, 0xf6, 0x79, 0xcd, 0xa9, 0xc2, 0xbf, 0xca, 0xe6, 0x22, 0x4d, 0x77, 0x8d, 0x44, 0x60,
+	0xad, 0x0a, 0xff, 0x2e, 0xe7, 0x2f, 0x77, 0x1b, 0x09, 0xfc, 0xa7, 0x9c, 0x5d, 0xba, 0x34, 0x43,
+	0xe8, 0xbf, 0x79, 0x84, 0xe6, 0x04, 0x69, 0xa3, 0x80, 0xaf, 0x8d, 0x9a, 0x22, 0xd2, 0x35, 0xb5,
+	0x76, 0xdb, 0x79, 0xbe, 0x62, 0xca, 0x58, 0xdf, 0x24, 0xcd, 0x80, 0xb2, 0x95, 0xfe, 0xb2, 0xf4,
+	0x42, 0xc5, 0xcc, 0x9c, 0x59, 0xec, 0xf1, 0x25, 0x1c, 0xe0, 0xbe, 0x68, 0x55, 0xf5, 0x16, 0x3d,
+	0xc0, 0x7c, 0xc9, 0x32, 0x75, 0x0e, 0x07, 0x98, 0x97, 0x2a, 0x26, 0x6d, 0x6a, 0x41, 0xa6, 0x2c,
+	0x50, 0x7b, 0x6e, 0xa8, 0x76, 0xd5, 0x97, 0x2b, 0xf9, 0xf5, 0x6f, 0xcd, 0x76, 0xf8, 0x4a, 0x25,
+	0xbf, 0x7c, 0xe6, 0xf6, 0xc2, 0xcb, 0x15, 0x5b, 0xb3, 0xc5, 0x65, 0xf0, 0xd5, 0x8a, 0x5d, 0x43,
+	0x78, 0xb4, 0x6a, 0x9d, 0xe8, 0xd0, 0x20, 0xbf, 0x11, 0x5e, 0xa9, 0x98, 0x5e, 0xd7, 0xfc, 0x26,
+	0x2e, 0xa7, 0x22, 0x1a, 0x8f, 0xf4, 0x4d, 0x09, 0x57, 0x2b, 0xee, 0x4e, 0xe7, 0x4e, 0x2b, 0xd2,
+	0x42, 0xe6, 0xab, 0xe9, 0x47, 0x98, 0x5f, 0x94, 0x86, 0x3f, 0x54, 0xdc, 0x5d, 0xce, 0x5d, 0x1f,
+	0x27, 0x97, 0x02, 0x09, 0x7f, 0xac, 0xb8, 0x9f, 0x76, 0xee, 0x58, 0x47, 0xd0, 0x4a, 0x45, 0x21,
+	0x69, 0x23, 0xfc, 0xa9, 0x62, 0x36, 0x9c, 0x41, 0xb1, 0x59, 0x0c, 0x79, 0xf6, 0xd6, 0x7a, 0xcd,
+	0x42, 0x6d, 0x03, 0x54, 0x4f, 0xc1, 0x26, 0xca, 0x65, 0x2e, 0x16, 0xe1, 0xcf, 0x15, 0xd3, 0xb5,
+	0x59, 0xc0, 0x03, 0x02, 0xaf, 0x5b, 0xe8, 0x9a, 0x44, 0xce, 0x70, 0x21, 0xa7, 0x23, 0x64, 0x94,
+	0x05, 0x70, 0xad, 0x62, 0xea, 0xb6, 0x90, 0x5d, 0x75, 0xde, 0x1b, 0x36, 0x0b, 0xf5, 0x15, 0x6c,
+	0x27, 0xe9, 0x2b, 0x45, 0x67, 0xef, 0x4d, 0x7b, 0x96, 0x46, 0xbf, 0xba, 0x2a, 0x31, 0x9e, 0xe3,
+	0xbb, 0x49, 0xdc, 0xd5, 0x26, 0x50, 0xc0, 0x5b, 0x15, 0xb3, 0xcb, 0xaa, 0x97, 0x94, 0xe6, 0xab,
+	0x96, 0xcc, 0x4b, 0xbc, 0x5d, 0xc9, 0x46, 0x3d, 0x43, 0xf5, 0x76, 0x9d, 0x11, 0xd8, 0xa1, 0x2b,
+	0x4a, 0x04, 0xde, 0xb1, 0xc5, 0x31, 0x11, 0x22, 0x61, 0x33, 0xe9, 0x47, 0x92, 0xfe, 0x38, 0x7c,
+	0x37, 0x5f, 0x54, 0xd8, 0x7f, 0x38, 0xc0, 0x7b, 0x15, 0x73, 0x63, 0xcf, 0x47, 0x03, 0x4a, 0xf0,
+	0x7e, 0xc5, 0xb4, 0x51, 0x7a, 0x5d, 0xe9, 0x28, 0xe1, 0x03, 0x1b, 0xb9, 0x6e, 0x99, 0x94, 0xd3,
+	0x92, 0x2a, 0xc0, 0x0f, 0x2b, 0xa6, 0x99, 0xd2, 0x3e, 0x1e, 0x9f, 0x69, 0x64, 0xa8, 0xaa, 0x69,
+	0x07, 0x07, 0xc6, 0x4c, 0x7c, 0x6b, 0xf9, 0x26, 0xf1, 0x4f, 0x8e, 0x99, 0x8e, 0xca, 0x24, 0x1a,
+	0x3d, 0x12, 0xa0, 0xe1, 0x1e, 0xbc, 0xbe, 0xbe, 0x79, 0xcc, 0x1d, 0x1a, 0x33, 0x15, 0xb1, 0x56,
+	0x42, 0x65, 0xc3, 0x48, 0x1d, 0xfe, 0x78, 0xa9, 0x71, 0x29, 0x49, 0xbb, 0x0b, 0x47, 0xc6, 0xcc,
+	0x12, 0xb9, 0xbe, 0x94, 0x6e, 0x5c, 0x38, 0x3a, 0x66, 0x2a, 0x75, 0x7d, 0xa1, 0x06, 0x8b, 0x23,
+	0xb5, 0x51, 0x1c, 0x1b, 0x33, 0x79, 0x2b, 0xc6, 0x35, 0x93, 0x84, 0x21, 0x1c, 0x1f, 0x33, 0x79,
+	0x2b, 0xf2, 0xac, 0xea, 0x89, 0x35, 0x90, 0x98, 0xd2, 0xd4, 0x90, 0x9e, 0x1c, 0x1b, 0x84, 0xdc,
+	0x70, 0x4d, 0xa8, 0xa7, 0xae, 0xc7, 0x37, 0x90, 0x9e, 0x1e, 0x33, 0xc9, 0xcf, 0xf8, 0xf5, 0x15,
+	0x55, 0x19, 0x3e, 0xc2, 0x19, 0xcb, 0x32, 0x75, 0x3c, 0xcd, 0x54, 0xd1, 0xec, 0xe6, 0x7c, 0x11,
+	0x1e, 0x98, 0x34, 0x25, 0x90, 0x5a, 0xc9, 0x15, 0xd3, 0x83, 0x93, 0xd5, 0x2f, 0x9d, 0x7d, 0x75,
+	0x64, 0xc3, 0xb1, 0x2b, 0x23, 0x1b, 0xcf, 0x5e, 0x19, 0xd9, 0x78, 0xf9, 0xca, 0xc8, 0xc6, 0x6f,
+	0x5c, 0x1d, 0xd9, 0x70, 0xf6, 0xea, 0xc8, 0x86, 0xe7, 0xae, 0x8e, 0x6c, 0xf8, 0xf2, 0x0e, 0xfb,
+	0xf5, 0x2e, 0x24, 0xcc, 0x1f, 0x0d, 0xf8, 0x68, 0xb4, 0x18, 0x8c, 0x9a, 0x2f, 0x79, 0x0b, 0x37,
+	0xe8, 0x2f, 0x74, 0x5f, 0xfc, 0x5f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x45, 0xfc, 0x2e, 0xb7, 0xf2,
+	0x13, 0x00, 0x00,
 }
diff --git a/go/pkg/pwagent/nginx.go b/go/pkg/pwagent/nginx.go
index e69d8ebd9..b0ca1d8b7 100644
--- a/go/pkg/pwagent/nginx.go
+++ b/go/pkg/pwagent/nginx.go
@@ -20,7 +20,6 @@ import (
 	"github.com/moby/moby/pkg/stdcopy"
 	"go.uber.org/zap"
 	"golang.org/x/crypto/sha3"
-	"moul.io/godev"
 	"pathwar.land/v2/go/pkg/errcode"
 	"pathwar.land/v2/go/pkg/pwapi"
 	"pathwar.land/v2/go/pkg/pwcompose"
@@ -49,9 +48,9 @@ func applyNginxConfig(ctx context.Context, apiInstances *pwapi.AgentListInstance
 	if err != nil {
 		return errcode.TODO.Wrap(err)
 	}
-	if logger.Check(zap.DebugLevel, "") != nil {
+	/*if logger.Check(zap.DebugLevel, "") != nil {
 		fmt.Fprintln(os.Stderr, "config", godev.PrettyJSON(config))
-	}
+	}*/
 
 	// configure nginx binary
 	buf, err := buildNginxConfigTar(config, logger)
@@ -77,7 +76,7 @@ func applyNginxConfig(ctx context.Context, apiInstances *pwapi.AgentListInstance
 	if err != nil {
 		return errcode.ErrNginxSendCommandReloadConfig.Wrap(err)
 	}
-	if logger.Check(zap.DebugLevel, "") != nil {
+	/*if logger.Check(zap.DebugLevel, "") != nil {
 		for _, upstream := range config.Upstreams {
 			fmt.Fprintf(os.Stderr, "- %s\n", upstream.Name)
 			for _, hash := range upstream.Hashes {
@@ -85,7 +84,7 @@ func applyNginxConfig(ctx context.Context, apiInstances *pwapi.AgentListInstance
 			}
 
 		}
-	}
+	}*/
 
 	return nil
 }
@@ -236,9 +235,9 @@ func buildNginxConfigTar(config *nginxConfig, logger *zap.Logger) (*bytes.Buffer
 	}
 	configBytes := configBuf.Bytes()
 
-	if logger.Check(zap.DebugLevel, "") != nil {
+	/* if logger.Check(zap.DebugLevel, "") != nil {
 		fmt.Fprintln(os.Stderr, string(configBytes))
-	}
+	}*/
 
 	var buf bytes.Buffer
 	tw := tar.NewWriter(&buf)
diff --git a/go/pkg/pwagent/update.go b/go/pkg/pwagent/update.go
index 6be699fdb..05cac1b19 100644
--- a/go/pkg/pwagent/update.go
+++ b/go/pkg/pwagent/update.go
@@ -5,7 +5,6 @@ import (
 	"fmt"
 
 	"github.com/docker/docker/client"
-	"moul.io/godev"
 	"pathwar.land/v2/go/pkg/errcode"
 	"pathwar.land/v2/go/pkg/pwapi"
 	"pathwar.land/v2/go/pkg/pwcompose"
@@ -41,7 +40,10 @@ func updateAPIState(ctx context.Context, apiInstances *pwapi.AgentListInstances_
 
 	// FIXME: update state only if it changed
 	input := pwapi.AgentUpdateState_Input{Instances: apiInstances.Instances}
-	fmt.Println(godev.PrettyJSONPB(&input))
+	//if logger.Check(zap.DebugLevel, "") != nil {
+	//	fmt.Println(godev.PrettyJSONPB(&input))
+	//}
+
 	if _, err := apiClient.AgentUpdateState(&input); err != nil {
 		return errcode.TODO.Wrap(err)
 	}
diff --git a/go/pkg/pwapi/api_agent-update-state.go b/go/pkg/pwapi/api_agent-update-state.go
index 1879fae47..03734a848 100644
--- a/go/pkg/pwapi/api_agent-update-state.go
+++ b/go/pkg/pwapi/api_agent-update-state.go
@@ -21,5 +21,6 @@ func (svc *service) AgentUpdateState(ctx context.Context, in *AgentUpdateState_I
 		}
 	}
 
-	return nil, errcode.ErrNotImplemented
+	ret := &AgentUpdateState_Output{}
+	return ret, nil
 }
diff --git a/go/pkg/pwapi/server.go b/go/pkg/pwapi/server.go
index 106ea8113..e5d586152 100644
--- a/go/pkg/pwapi/server.go
+++ b/go/pkg/pwapi/server.go
@@ -16,8 +16,11 @@ import (
 	grpc_auth "github.com/grpc-ecosystem/go-grpc-middleware/auth"
 	grpc_zap "github.com/grpc-ecosystem/go-grpc-middleware/logging/zap"
 	grpc_recovery "github.com/grpc-ecosystem/go-grpc-middleware/recovery"
+	grpc_opentracing "github.com/grpc-ecosystem/go-grpc-middleware/tracing/opentracing"
 	"github.com/grpc-ecosystem/grpc-gateway/runtime"
 	"github.com/oklog/run"
+	opentracing "github.com/opentracing/opentracing-go"
+	"github.com/opentracing/opentracing-go/ext"
 	"github.com/rs/cors"
 	"github.com/soheilhy/cmux"
 	chilogger "github.com/treastech/logger"
@@ -133,6 +136,7 @@ type ServerOpts struct {
 	RequestTimeout     time.Duration
 	ShutdownTimeout    time.Duration
 	WithPprof          bool
+	Tracer             opentracing.Tracer
 }
 
 func (s *Server) Run() error {
@@ -157,18 +161,28 @@ func grpcServer(svc Service, opts ServerOpts) (*grpc.Server, error) {
 	}
 	serverStreamOpts := []grpc.StreamServerInterceptor{
 		grpc_recovery.StreamServerInterceptor(),
+	}
+	serverUnaryOpts := []grpc.UnaryServerInterceptor{
+		grpc_recovery.UnaryServerInterceptor(),
+	}
+	if opts.Tracer != nil {
+		tracingOpts := []grpc_opentracing.Option{grpc_opentracing.WithTracer(opts.Tracer)}
+		serverStreamOpts = append(serverStreamOpts, grpc_opentracing.StreamServerInterceptor(tracingOpts...))
+		serverUnaryOpts = append(serverUnaryOpts, grpc_opentracing.UnaryServerInterceptor(tracingOpts...))
+	}
+	serverStreamOpts = append(serverStreamOpts,
 		grpc_auth.StreamServerInterceptor(authFunc),
 		//grpc_ctxtags.StreamServerInterceptor(),
 		grpc_zap.StreamServerInterceptor(logger),
 		grpc_recovery.StreamServerInterceptor(),
-	}
-	serverUnaryOpts := []grpc.UnaryServerInterceptor{
-		grpc_recovery.UnaryServerInterceptor(),
+	)
+	serverUnaryOpts = append(
+		serverUnaryOpts,
 		grpc_auth.UnaryServerInterceptor(authFunc),
 		//grpc_ctxtags.UnaryServerInterceptor(),
 		grpc_zap.UnaryServerInterceptor(logger),
 		grpc_recovery.UnaryServerInterceptor(),
-	}
+	)
 	grpcServer := grpc.NewServer(
 		grpc.StreamInterceptor(grpc_middleware.ChainStreamServer(serverStreamOpts...)),
 		grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(serverUnaryOpts...)),
@@ -195,19 +209,56 @@ func httpServer(ctx context.Context, serverListenerAddr string, opts ServerOpts)
 	r.Use(middleware.Timeout(opts.RequestTimeout))
 	r.Use(middleware.RealIP)
 	r.Use(middleware.RequestID)
-	gwmux := runtime.NewServeMux(
+
+	runtimeMux := runtime.NewServeMux(
 		runtime.WithMarshalerOption(runtime.MIMEWildcard, &gateway.JSONPb{
 			EmitDefaults: false,
 			Indent:       "  ",
 			OrigName:     true,
 		}),
 		runtime.WithProtoErrorHandler(runtime.DefaultHTTPProtoErrorHandler),
+		runtime.WithIncomingHeaderMatcher(incomingHeaderMatcherFunc),
 	)
-	grpcOpts := []grpc.DialOption{grpc.WithInsecure()}
-	err := RegisterServiceHandlerFromEndpoint(ctx, gwmux, serverListenerAddr, grpcOpts)
+	var gwmux http.Handler = runtimeMux
+	dialOpts := []grpc.DialOption{grpc.WithInsecure()}
+	if opts.Tracer != nil {
+		var grpcGatewayTag = opentracing.Tag{Key: string(ext.Component), Value: "grpc-gateway"}
+		tracingWrapper := func(h http.Handler) http.Handler {
+			return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				parentSpanContext, err := opts.Tracer.Extract(
+					opentracing.HTTPHeaders,
+					opentracing.HTTPHeadersCarrier(r.Header),
+				)
+				if err == nil || err == opentracing.ErrSpanContextNotFound {
+					serverSpan := opts.Tracer.StartSpan(
+						"ServeHTTP",
+						ext.RPCServerOption(parentSpanContext),
+						grpcGatewayTag,
+					)
+					r = r.WithContext(opentracing.ContextWithSpan(r.Context(), serverSpan))
+					defer serverSpan.Finish()
+				}
+				fmt.Println(r.Context())
+				h.ServeHTTP(w, r)
+			})
+		}
+		gwmux = tracingWrapper(gwmux)
+
+		dialOpts = append(dialOpts,
+			grpc.WithStreamInterceptor(
+				grpc_opentracing.StreamClientInterceptor(
+					grpc_opentracing.WithTracer(opts.Tracer))),
+			grpc.WithUnaryInterceptor(
+				grpc_opentracing.UnaryClientInterceptor(
+					grpc_opentracing.WithTracer(opts.Tracer))),
+		)
+	}
+
+	err := RegisterServiceHandlerFromEndpoint(ctx, runtimeMux, serverListenerAddr, dialOpts)
 	if err != nil {
 		return nil, errcode.ErrServerRegisterGateway.Wrap(err)
 	}
+
 	r.Mount("/", gwmux)
 	if opts.WithPprof {
 		r.HandleFunc("/debug/pprof/*", pprof.Index)
diff --git a/go/pkg/pwapi/tracing.go b/go/pkg/pwapi/tracing.go
new file mode 100644
index 000000000..094aff2fd
--- /dev/null
+++ b/go/pkg/pwapi/tracing.go
@@ -0,0 +1,36 @@
+package pwapi
+
+import (
+	"strings"
+
+	"github.com/grpc-ecosystem/grpc-gateway/runtime"
+)
+
+var (
+	// trace header to propagate.
+	traceHeaders = []string{
+		"x-ot-span-context",
+		"x-request-id",
+
+		// Zipkin headers
+		"b3",
+		"x-b3-traceid",
+		"x-b3-spanid",
+		"x-b3-parentspanid",
+		"x-b3-sampled",
+		"X-b3-flags",
+
+		// Jaeger header (for native client)
+		"uber-trace-id",
+	}
+)
+
+func incomingHeaderMatcherFunc(key string) (string, bool) {
+	k := strings.ToLower(key)
+	for _, v := range traceHeaders {
+		if v == k {
+			return key, true
+		}
+	}
+	return runtime.DefaultHeaderMatcher(key)
+}