Merge 0d9e3d19aff81c1fc40fbaea901c99b08ff48ad7 into 915e4c90d28ec4cffc6eb146e208ab5a65eac772

use method Get to get existing data.

context.go

@@ -291,6 +291,18 @@ func (c *Context) Get(key any) (value any, exists bool) {
 	return
 }
 
+// GetAs returns the value for the given key, ie: (value, true).
+// If the value does not exist it returns (nil, false)
+func (c *Context) GetAs[T any](key string) (result T, exists bool) {
+	value, exists := c.Get(key)
+	if !exists {
+	   return	
+	}	
+	
+	result, exists = value.(T)
+	return
+}
+
 // MustGet returns the value for the given key if it exists, otherwise it panics.
 func (c *Context) MustGet(key any) any {
 	if value, exists := c.Get(key); exists {

context_test.go

@@ -1910,7 +1910,7 @@ func TestContextClientIP(t *testing.T) {
 	resetContextForClientIPTests(c)
 
 	// IPv6 support
-	c.Request.RemoteAddr = "[::1]:12345"
+	c.Request.RemoteAddr = fmt.Sprintf("[%s]:12345", localhostIPv6)
 	assert.Equal(t, "20.20.20.20", c.ClientIP())
 
 	resetContextForClientIPTests(c)
@@ -3212,7 +3212,7 @@ func TestContextCopyShouldNotCancel(t *testing.T) {
 	}()
 
 	addr := strings.Split(l.Addr().String(), ":")
-	res, err := http.Get(fmt.Sprintf("http://127.0.0.1:%s/", addr[len(addr)-1]))
+	res, err := http.Get(fmt.Sprintf("http://%s:%s/", localhostIP, addr[len(addr)-1]))
 	if err != nil {
 		t.Error(fmt.Errorf("request error: %w", err))
 		return

gin_test.go

@@ -83,7 +83,7 @@ func TestLoadHTMLGlobDebugMode(t *testing.T) {
 }
 
 func TestH2c(t *testing.T) {
-	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	ln, err := net.Listen("tcp", localhostIP+":0")
 	if err != nil {
 		t.Error(err)
 	}

utils.go

@@ -19,6 +19,12 @@ import (
 // BindKey indicates a default bind key.
 const BindKey = "_gin-gonic/gin/bindkey"
 
+// localhostIP indicates the default localhost IP address.
+const localhostIP = "127.0.0.1"
+
+// localhostIPv6 indicates the default localhost IPv6 address.
+const localhostIPv6 = "::1"
+
 // Bind is a helper function for given interface object and returns a Gin middleware.
 func Bind(val any) HandlerFunc {
 	value := reflect.ValueOf(val)