update

cmd/cart/main.go

@@ -22,6 +22,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 )
 
 var (
@@ -167,7 +168,7 @@ func main() {
 		log.Fatalf("Unable to start otel %v", err)
 	}
 
-	mux.Handle("/cart/", syncedServer.Serve())
+	mux.Handle("/cart", syncedServer.Serve())
 	// only for local
 	mux.HandleFunc("GET /add/remote/{host}", func(w http.ResponseWriter, r *http.Request) {
 		pool.AddRemote(r.PathValue("host"))
@@ -216,7 +217,7 @@ func main() {
 		BaseContext:  func(net.Listener) context.Context { return ctx },
 		ReadTimeout:  10 * time.Second,
 		WriteTimeout: 20 * time.Second,
-		Handler:      mux,
+		Handler:      otelhttp.NewHandler(mux, "/"),
 	}
 
 	defer func() {