Setup different name; Copying of headers is not required for spans

docker-compose.yaml

@@ -3,14 +3,14 @@ version: '2'
 services:
   podinfo_frontend:
     build: .
-    command: ./podinfo --backend-url http://podinfo_backend:9899/status/200
+    command: ./podinfo --backend-url http://podinfo_backend:9899/status/200 --otel-service-name=podinfo_frontend
     environment:
       - OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=http://otel:4317
     ports:
       - "9898:9898"
   podinfo_backend:
     build: .
-    command: ./podinfo --port 9899
+    command: ./podinfo --port 9899 --otel-service-name=podinfo_backend
     environment:
       - OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=http://otel:4317
     ports:

pkg/api/echo.go

@@ -55,9 +55,6 @@ func (s *Server) echoHandler(w http.ResponseWriter, r *http.Request) {
 					return
 				}
 
-				// forward headers
-				copyTracingHeaders(r, backendReq)
-
 				backendReq.Header.Set("X-API-Version", version.VERSION)
 				backendReq.Header.Set("X-API-Revision", version.REVISION)
 
@@ -107,22 +104,3 @@ func (s *Server) echoHandler(w http.ResponseWriter, r *http.Request) {
 		w.Write(body)
 	}
 }
-
-func copyTracingHeaders(from *http.Request, to *http.Request) {
-	headers := []string{
-		"x-request-id",
-		"x-b3-traceid",
-		"x-b3-spanid",
-		"x-b3-parentspanid",
-		"x-b3-sampled",
-		"x-b3-flags",
-		"x-ot-span-context",
-	}
-
-	for i := range headers {
-		headerValue := from.Header.Get(headers[i])
-		if len(headerValue) > 0 {
-			to.Header.Set(headers[i], headerValue)
-		}
-	}
-}

pkg/api/mock.go

@@ -1,9 +1,10 @@
 package api
 
 import (
-	"go.opentelemetry.io/otel/trace"
 	"time"
 
+	"go.opentelemetry.io/otel/trace"
+
 	"github.com/gorilla/mux"
 	"go.uber.org/zap"
 )