change startRequestSpan in httptrace

contrib/internal/httptrace/httptrace.go

@@ -86,25 +86,6 @@ func StartRequestSpan(r *http.Request, opts ...ddtrace.StartSpanOption) (tracer.
 		}
 	}
 
-	// Propagate baggage *before* starting the span.
-	if inferredProxySpan == nil {
-		spanParentCtx, spanParentErr := tracer.Extract(tracer.HTTPHeadersCarrier(r.Header))
-		if spanParentErr == nil {
-			baggageMap := make(map[string]string)
-			spanParentCtx.ForeachBaggageItem(func(k, v string) bool {
-				baggageMap[k] = v
-				return true
-			})
-			if len(baggageMap) > 0 {
-				ctx := r.Context()
-				for k, v := range baggageMap {
-					ctx = baggage.Set(ctx, k, v)
-				}
-				r = r.WithContext(ctx)
-			}
-		}
-	}
-
 	nopts = append(nopts,
 		func(ssCfg *ddtrace.StartSpanConfig) {
 			if ssCfg.Tags == nil {
@@ -128,6 +109,19 @@ func StartRequestSpan(r *http.Request, opts ...ddtrace.StartSpanOption) (tracer.
 						tracer.WithSpanLinks(spanLinksCtx.SpanLinks())(ssCfg)
 					}
 					tracer.ChildOf(spanParentCtx)(ssCfg)
+
+					baggageMap := make(map[string]string)
+					spanParentCtx.ForeachBaggageItem(func(k, v string) bool {
+						baggageMap[k] = v
+						return true
+					})
+					if len(baggageMap) > 0 {
+						ctx := r.Context()
+						for k, v := range baggageMap {
+							ctx = baggage.Set(ctx, k, v)
+						}
+						r = r.WithContext(ctx)
+					}
 				}
 			}