diff --git a/binding/default_validator.go b/binding/default_validator.go
index 87fc4c66..a91e0496 100644
--- a/binding/default_validator.go
+++ b/binding/default_validator.go
@@ -8,13 +8,11 @@ import (
 	"fmt"
 	"reflect"
 	"strings"
-	"sync"
 
 	"github.com/go-playground/validator/v10"
 )
 
 type defaultValidator struct {
-	once     sync.Once
 	validate *validator.Validate
 }
 
@@ -76,7 +74,7 @@ func (v *defaultValidator) ValidateStruct(obj interface{}) error {
 
 // validateStruct receives struct type
 func (v *defaultValidator) validateStruct(obj interface{}) error {
-	v.lazyinit()
+	v.lazyInit()
 	return v.validate.Struct(obj)
 }
 
@@ -85,13 +83,14 @@ func (v *defaultValidator) validateStruct(obj interface{}) error {
 // or struct level validations. See validator GoDoc for more info -
 // https://pkg.go.dev/github.com/go-playground/validator/v10
 func (v *defaultValidator) Engine() interface{} {
-	v.lazyinit()
+	v.lazyInit()
 	return v.validate
 }
 
-func (v *defaultValidator) lazyinit() {
-	v.once.Do(func() {
+// lazyInit initialize the validate Settings, no need to use sync.once
+func (v *defaultValidator) lazyInit() {
+	if v.validate == nil {
 		v.validate = validator.New()
 		v.validate.SetTagName("binding")
-	})
+	}
 }
diff --git a/binding/form_mapping.go b/binding/form_mapping.go
index f8b4b123..30c65dca 100644
--- a/binding/form_mapping.go
+++ b/binding/form_mapping.go
@@ -17,7 +17,8 @@ import (
 )
 
 var (
-	errUnknownType = errors.New("unknown type")
+	// ErrUnknownType unknown type
+	ErrUnknownType = errors.New("unknown type")
 
 	// ErrConvertMapStringSlice can not covert to map[string][]string
 	ErrConvertMapStringSlice = errors.New("can not convert to map slices of strings")
@@ -164,7 +165,7 @@ func tryToSetValue(value reflect.Value, field reflect.StructField, setter setter
 	return setter.TrySet(value, field, tagValue, setOpt)
 }
 
-func setByForm(value reflect.Value, field reflect.StructField, form map[string][]string, tagValue string, opt setOptions) (isSetted bool, err error) {
+func setByForm(value reflect.Value, field reflect.StructField, form map[string][]string, tagValue string, opt setOptions) (bool, error) {
 	vs, ok := form[tagValue]
 	if !ok && !opt.isDefaultExists {
 		return false, nil
@@ -240,7 +241,7 @@ func setWithProperType(val string, value reflect.Value, field reflect.StructFiel
 	case reflect.Map:
 		return json.Unmarshal(bytesconv.StringToBytes(val), value.Addr().Interface())
 	default:
-		return errUnknownType
+		return ErrUnknownType
 	}
 	return nil
 }
diff --git a/binding/form_mapping_test.go b/binding/form_mapping_test.go
index 516554eb..2e4e7d4c 100644
--- a/binding/form_mapping_test.go
+++ b/binding/form_mapping_test.go
@@ -124,7 +124,7 @@ func TestMappingUnknownFieldType(t *testing.T) {
 
 	err := mappingByPtr(&s, formSource{"U": {"unknown"}}, "form")
 	assert.Error(t, err)
-	assert.Equal(t, errUnknownType, err)
+	assert.Equal(t, ErrUnknownType, err)
 }
 
 func TestMappingURI(t *testing.T) {
diff --git a/binding/multipart_form_mapping.go b/binding/multipart_form_mapping.go
index 69c0a544..b8887105 100644
--- a/binding/multipart_form_mapping.go
+++ b/binding/multipart_form_mapping.go
@@ -32,7 +32,7 @@ func (r *multipartRequest) TrySet(value reflect.Value, field reflect.StructField
 	return setByForm(value, field, r.MultipartForm.Value, key, opt)
 }
 
-func setByMultipartFormFile(value reflect.Value, field reflect.StructField, files []*multipart.FileHeader) (isSetted bool, err error) {
+func setByMultipartFormFile(value reflect.Value, field reflect.StructField, files []*multipart.FileHeader) (bool, error) {
 	switch value.Kind() {
 	case reflect.Ptr:
 		switch value.Interface().(type) {
@@ -48,7 +48,7 @@ func setByMultipartFormFile(value reflect.Value, field reflect.StructField, file
 		}
 	case reflect.Slice:
 		slice := reflect.MakeSlice(value.Type(), len(files), len(files))
-		isSetted, err = setArrayOfMultipartFormFiles(slice, field, files)
+		isSetted, err := setArrayOfMultipartFormFiles(slice, field, files)
 		if err != nil || !isSetted {
 			return isSetted, err
 		}
@@ -60,7 +60,7 @@ func setByMultipartFormFile(value reflect.Value, field reflect.StructField, file
 	return false, ErrMultiFileHeader
 }
 
-func setArrayOfMultipartFormFiles(value reflect.Value, field reflect.StructField, files []*multipart.FileHeader) (isSetted bool, err error) {
+func setArrayOfMultipartFormFiles(value reflect.Value, field reflect.StructField, files []*multipart.FileHeader) (bool, error) {
 	if value.Len() != len(files) {
 		return false, ErrMultiFileHeaderLenInvalid
 	}
diff --git a/context.go b/context.go
index 8a2f46d1..39284dbd 100644
--- a/context.go
+++ b/context.go
@@ -766,7 +766,7 @@ func (c *Context) ClientIP() string {
 
 	if trusted && c.engine.ForwardedByClientIP && c.engine.RemoteIPHeaders != nil {
 		for _, headerName := range c.engine.RemoteIPHeaders {
-			ip, valid := validateHeader(c.requestHeader(headerName))
+			ip, valid := getIPFromHeader(c.requestHeader(headerName))
 			if valid {
 				return ip
 			}
@@ -800,10 +800,17 @@ func (c *Context) RemoteIP() (net.IP, bool) {
 	return remoteIP, false
 }
 
-func validateHeader(header string) (clientIP string, valid bool) {
+// getIPFromHeader return clientIP,valid when validate ip address
+func getIPFromHeader(header string) (string, bool) {
 	if header == "" {
 		return "", false
 	}
+
+	var (
+		clientIP string
+		valid    bool
+	)
+
 	items := strings.Split(header, ",")
 	for i, ipStr := range items {
 		ipStr = strings.TrimSpace(ipStr)
@@ -820,7 +827,8 @@ func validateHeader(header string) (clientIP string, valid bool) {
 			valid = true
 		}
 	}
-	return
+
+	return clientIP, valid
 }
 
 // ContentType returns the Content-Type header of the request.
diff --git a/ginS/gins.go b/ginS/gins.go
index 3080fd34..0effc8e6 100644
--- a/ginS/gins.go
+++ b/ginS/gins.go
@@ -7,100 +7,97 @@ package ginS
 import (
 	"html/template"
 	"net/http"
-	"sync"
 
 	"github.com/gin-gonic/gin"
 )
 
-var once sync.Once
-var internalEngine *gin.Engine
+var engine *gin.Engine
 
-func engine() *gin.Engine {
-	once.Do(func() {
-		internalEngine = gin.Default()
-	})
-	return internalEngine
+func init() {
+	if engine == nil {
+		engine = gin.Default()
+	}
 }
 
 // LoadHTMLGlob is a wrapper for Engine.LoadHTMLGlob.
 func LoadHTMLGlob(pattern string) {
-	engine().LoadHTMLGlob(pattern)
+	engine.LoadHTMLGlob(pattern)
 }
 
 // LoadHTMLFiles is a wrapper for Engine.LoadHTMLFiles.
 func LoadHTMLFiles(files ...string) {
-	engine().LoadHTMLFiles(files...)
+	engine.LoadHTMLFiles(files...)
 }
 
 // SetHTMLTemplate is a wrapper for Engine.SetHTMLTemplate.
 func SetHTMLTemplate(templ *template.Template) {
-	engine().SetHTMLTemplate(templ)
+	engine.SetHTMLTemplate(templ)
 }
 
 // NoRoute adds handlers for NoRoute. It return a 404 code by default.
 func NoRoute(handlers ...gin.HandlerFunc) {
-	engine().NoRoute(handlers...)
+	engine.NoRoute(handlers...)
 }
 
 // NoMethod is a wrapper for Engine.NoMethod.
 func NoMethod(handlers ...gin.HandlerFunc) {
-	engine().NoMethod(handlers...)
+	engine.NoMethod(handlers...)
 }
 
 // Group creates a new router group. You should add all the routes that have common middlewares or the same path prefix.
 // For example, all the routes that use a common middleware for authorization could be grouped.
 func Group(relativePath string, handlers ...gin.HandlerFunc) *gin.RouterGroup {
-	return engine().Group(relativePath, handlers...)
+	return engine.Group(relativePath, handlers...)
 }
 
 // Handle is a wrapper for Engine.Handle.
 func Handle(httpMethod, relativePath string, handlers ...gin.HandlerFunc) gin.IRoutes {
-	return engine().Handle(httpMethod, relativePath, handlers...)
+	return engine.Handle(httpMethod, relativePath, handlers...)
 }
 
 // POST is a shortcut for router.Handle("POST", path, handle)
 func POST(relativePath string, handlers ...gin.HandlerFunc) gin.IRoutes {
-	return engine().POST(relativePath, handlers...)
+	return engine.POST(relativePath, handlers...)
 }
 
 // GET is a shortcut for router.Handle("GET", path, handle)
 func GET(relativePath string, handlers ...gin.HandlerFunc) gin.IRoutes {
-	return engine().GET(relativePath, handlers...)
+	return engine.GET(relativePath, handlers...)
 }
 
 // DELETE is a shortcut for router.Handle("DELETE", path, handle)
 func DELETE(relativePath string, handlers ...gin.HandlerFunc) gin.IRoutes {
-	return engine().DELETE(relativePath, handlers...)
+	return engine.DELETE(relativePath, handlers...)
 }
 
 // PATCH is a shortcut for router.Handle("PATCH", path, handle)
 func PATCH(relativePath string, handlers ...gin.HandlerFunc) gin.IRoutes {
-	return engine().PATCH(relativePath, handlers...)
+	return engine.PATCH(relativePath, handlers...)
 }
 
 // PUT is a shortcut for router.Handle("PUT", path, handle)
 func PUT(relativePath string, handlers ...gin.HandlerFunc) gin.IRoutes {
-	return engine().PUT(relativePath, handlers...)
+	return engine.PUT(relativePath, handlers...)
 }
 
 // OPTIONS is a shortcut for router.Handle("OPTIONS", path, handle)
 func OPTIONS(relativePath string, handlers ...gin.HandlerFunc) gin.IRoutes {
-	return engine().OPTIONS(relativePath, handlers...)
+	return engine.OPTIONS(relativePath, handlers...)
 }
 
 // HEAD is a shortcut for router.Handle("HEAD", path, handle)
 func HEAD(relativePath string, handlers ...gin.HandlerFunc) gin.IRoutes {
-	return engine().HEAD(relativePath, handlers...)
+	return engine.HEAD(relativePath, handlers...)
 }
 
 // Any is a wrapper for Engine.Any.
 func Any(relativePath string, handlers ...gin.HandlerFunc) gin.IRoutes {
-	return engine().Any(relativePath, handlers...)
+	return engine.Any(relativePath, handlers...)
 }
 
 // StaticFile is a wrapper for Engine.StaticFile.
 func StaticFile(relativePath, filepath string) gin.IRoutes {
-	return engine().StaticFile(relativePath, filepath)
+	return engine.StaticFile(relativePath, filepath)
 }
 
 // Static serves files from the given file system root.
@@ -110,50 +107,50 @@ func StaticFile(relativePath, filepath string) gin.IRoutes {
 // use :
 //     router.Static("/static", "/var/www")
 func Static(relativePath, root string) gin.IRoutes {
-	return engine().Static(relativePath, root)
+	return engine.Static(relativePath, root)
 }
 
 // StaticFS is a wrapper for Engine.StaticFS.
 func StaticFS(relativePath string, fs http.FileSystem) gin.IRoutes {
-	return engine().StaticFS(relativePath, fs)
+	return engine.StaticFS(relativePath, fs)
 }
 
 // Use attaches a global middleware to the router. ie. the middlewares attached though Use() will be
 // included in the handlers chain for every single request. Even 404, 405, static files...
 // For example, this is the right place for a logger or error management middleware.
 func Use(middlewares ...gin.HandlerFunc) gin.IRoutes {
-	return engine().Use(middlewares...)
+	return engine.Use(middlewares...)
 }
 
 // Routes returns a slice of registered routes.
 func Routes() gin.RoutesInfo {
-	return engine().Routes()
+	return engine.Routes()
 }
 
 // Run attaches to a http.Server and starts listening and serving HTTP requests.
 // It is a shortcut for http.ListenAndServe(addr, router)
 // Note: this method will block the calling goroutine indefinitely unless an error happens.
 func Run(addr ...string) (err error) {
-	return engine().Run(addr...)
+	return engine.Run(addr...)
 }
 
 // RunTLS attaches to a http.Server and starts listening and serving HTTPS requests.
 // It is a shortcut for http.ListenAndServeTLS(addr, certFile, keyFile, router)
 // Note: this method will block the calling goroutine indefinitely unless an error happens.
 func RunTLS(addr, certFile, keyFile string) (err error) {
-	return engine().RunTLS(addr, certFile, keyFile)
+	return engine.RunTLS(addr, certFile, keyFile)
 }
 
 // RunUnix attaches to a http.Server and starts listening and serving HTTP requests
 // through the specified unix socket (ie. a file)
 // Note: this method will block the calling goroutine indefinitely unless an error happens.
 func RunUnix(file string) (err error) {
-	return engine().RunUnix(file)
+	return engine.RunUnix(file)
 }
 
 // RunFd attaches the router to a http.Server and starts listening and serving HTTP requests
 // through the specified file descriptor.
 // Note: the method will block the calling goroutine indefinitely unless on error happens.
 func RunFd(fd int) (err error) {
-	return engine().RunFd(fd)
+	return engine.RunFd(fd)
 }
diff --git a/render/render_test.go b/render/render_test.go
index e417731a..e36d7755 100644
--- a/render/render_test.go
+++ b/render/render_test.go
@@ -321,8 +321,7 @@ func TestRenderRedirect(t *testing.T) {
 
 	w = httptest.NewRecorder()
 	assert.PanicsWithValue(t, "Cannot redirect with status code 200", func() {
-		err := data2.Render(w)
-		assert.NoError(t, err)
+		assert.NoError(t, data2.Render(w))
 	})
 
 	data3 := Redirect{