feat(requestid): reqID in the header

internal/pkg/middleware/requestid.go

@@ -2,8 +2,19 @@ package middleware
 
 import "github.com/gin-gonic/gin"
 
+const requestID = "X-Request-Id"
+
 func RequestID() gin.HandlerFunc {
 	return func(ctx *gin.Context) {
-		ctx.Set("X-Request-Id", "123")
+		var rid string
+
+		if rid = ctx.GetString(requestID); rid != "" {
+			// request id exists already
+			ctx.Next()
+		}
+
+		if rid = ctx.GetHeader(requestID); rid != "" {
+			ctx.Set(requestID, rid)
+		}
 	}
 }

internal/pkg/middleware/requestid_test.go

@@ -9,8 +9,6 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-const requestID = "X-Request-Id"
-
 type header struct {
 	Key   string
 	Value string