Merge branch 'master' of github.com:gin-gonic/gin into support-go1.25

2025-10-14 04:08:15 +08:00 · 2025-09-19 08:44:01 +08:00 · 2025-09-19 08:44:01 +08:00 · e6de1831f9
commit e6de1831f9
parent db2c3e486b da372fc778
41 changed files with 1178 additions and 277 deletions
--- a/.github/workflows/gin.yml
+++ b/.github/workflows/gin.yml
@ -20,7 +20,7 @@ jobs:
        with:
          fetch-depth: 0
      - name: Set up Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
        with:
          go-version: "^1"
      - name: Setup golangci-lint
@ -55,7 +55,7 @@ jobs:
      GOPROXY: https://proxy.golang.org
    steps:
      - name: Set up Go ${{ matrix.go }}
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
        with:
          go-version: ${{ matrix.go }}
          cache: false
--- a/.github/workflows/goreleaser.yml
+++ b/.github/workflows/goreleaser.yml
@ -17,7 +17,7 @@ jobs:
        with:
          fetch-depth: 0
      - name: Set up Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
        with:
          go-version: "^1"
      - name: Run GoReleaser
@ -29,3 +29,8 @@ jobs:
          args: release --clean
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Trigger Go module reindex (pkg.go.dev)
+        run: |
+          echo "Triggering Go module reindex at proxy.golang.org"
+          curl -sSf "https://proxy.golang.org/github.com/${GITHUB_REPOSITORY,,}/@v/${GITHUB_REF_NAME}.info"
--- a/README.md
+++ b/README.md
@ -2,7 +2,7 @@

 <img align="right" width="159px" src="https://raw.githubusercontent.com/gin-gonic/logo/master/color.png">

-[![Build Status](https://github.com/gin-gonic/gin/workflows/Run%20Tests/badge.svg?branch=master)](https://github.com/gin-gonic/gin/actions?query=branch%3Amaster)
+[![Build Status](https://github.com/gin-gonic/gin/actions/workflows/gin.yml/badge.svg?branch=master)](https://github.com/gin-gonic/gin/actions/workflows/gin.yml)
 [![codecov](https://codecov.io/gh/gin-gonic/gin/branch/master/graph/badge.svg)](https://codecov.io/gh/gin-gonic/gin)
 [![Go Report Card](https://goreportcard.com/badge/github.com/gin-gonic/gin)](https://goreportcard.com/report/github.com/gin-gonic/gin)
 [![Go Reference](https://pkg.go.dev/badge/github.com/gin-gonic/gin?status.svg)](https://pkg.go.dev/github.com/gin-gonic/gin?tab=doc)
@ -104,6 +104,7 @@ The documentation is also available on [gin-gonic.com](https://gin-gonic.com) in
 - [Persian](https://gin-gonic.com/fa/docs/)
 - [Português](https://gin-gonic.com/pt/docs/)
 - [Russian](https://gin-gonic.com/ru/docs/)
+- [Indonesian](https://gin-gonic.com/id/docs/)

 ### Articles

--- a/binding/form_mapping.go
+++ b/binding/form_mapping.go
@ -13,8 +13,8 @@ import (
 	"strings"
 	"time"

+	"github.com/gin-gonic/gin/codec/json"
 	"github.com/gin-gonic/gin/internal/bytesconv"
-	"github.com/gin-gonic/gin/internal/json"
 )

 var (
@ -175,7 +175,7 @@ func tryToSetValue(value reflect.Value, field reflect.StructField, setter setter

 // BindUnmarshaler is the interface used to wrap the UnmarshalParam method.
 type BindUnmarshaler interface {
-	// UnmarshalParam decodes and assigns a value from an form or query param.
+	// UnmarshalParam decodes and assigns a value from a form or query param.
 	UnmarshalParam(param string) error
 }

@ -333,9 +333,9 @@ func setWithProperType(val string, value reflect.Value, field reflect.StructFiel
 		case multipart.FileHeader:
 			return nil
 		}
-		return json.Unmarshal(bytesconv.StringToBytes(val), value.Addr().Interface())
+		return json.API.Unmarshal(bytesconv.StringToBytes(val), value.Addr().Interface())
 	case reflect.Map:
-		return json.Unmarshal(bytesconv.StringToBytes(val), value.Addr().Interface())
+		return json.API.Unmarshal(bytesconv.StringToBytes(val), value.Addr().Interface())
 	case reflect.Ptr:
 		if !value.Elem().IsValid() {
 			value.Set(reflect.New(value.Type().Elem()))
--- a/binding/json.go
+++ b/binding/json.go
@ -10,7 +10,7 @@ import (
 	"io"
 	"net/http"

-	"github.com/gin-gonic/gin/internal/json"
+	"github.com/gin-gonic/gin/codec/json"
 )

 // EnableDecoderUseNumber is used to call the UseNumber method on the JSON
@ -42,7 +42,7 @@ func (jsonBinding) BindBody(body []byte, obj any) error {
 }

 func decodeJSON(r io.Reader, obj any) error {
-	decoder := json.NewDecoder(r)
+	decoder := json.API.NewDecoder(r)
 	if EnableDecoderUseNumber {
 		decoder.UseNumber()
 	}
--- a/binding/json_test.go
+++ b/binding/json_test.go
@ -5,8 +5,16 @@
 package binding

 import (
+	"io"
+	"net/http/httptest"
 	"testing"
+	"time"
+	"unsafe"

+	"github.com/gin-gonic/gin/codec/json"
+	"github.com/gin-gonic/gin/render"
+	jsoniter "github.com/json-iterator/go"
+	"github.com/modern-go/reflect2"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@ -28,3 +36,181 @@ func TestJSONBindingBindBodyMap(t *testing.T) {
 	assert.Equal(t, "FOO", s["foo"])
 	assert.Equal(t, "world", s["hello"])
 }
+
+func TestCustomJsonCodec(t *testing.T) {
+	// Restore json encoding configuration after testing
+	oldMarshal := json.API
+	defer func() {
+		json.API = oldMarshal
+	}()
+	// Custom json api
+	json.API = customJsonApi{}
+
+	// test decode json
+	obj := customReq{}
+	err := jsonBinding{}.BindBody([]byte(`{"time_empty":null,"time_struct": "2001-12-05 10:01:02.345","time_nil":null,"time_pointer":"2002-12-05 10:01:02.345"}`), &obj)
+	require.NoError(t, err)
+	assert.Equal(t, zeroTime, obj.TimeEmpty)
+	assert.Equal(t, time.Date(2001, 12, 5, 10, 1, 2, 345000000, time.Local), obj.TimeStruct)
+	assert.Nil(t, obj.TimeNil)
+	assert.Equal(t, time.Date(2002, 12, 5, 10, 1, 2, 345000000, time.Local), *obj.TimePointer)
+	// test encode json
+	w := httptest.NewRecorder()
+	err2 := (render.PureJSON{Data: obj}).Render(w)
+	require.NoError(t, err2)
+	assert.JSONEq(t, "{\"time_empty\":null,\"time_struct\":\"2001-12-05 10:01:02.345\",\"time_nil\":null,\"time_pointer\":\"2002-12-05 10:01:02.345\"}\n", w.Body.String())
+	assert.Equal(t, "application/json; charset=utf-8", w.Header().Get("Content-Type"))
+}
+
+type customReq struct {
+	TimeEmpty   time.Time  `json:"time_empty"`
+	TimeStruct  time.Time  `json:"time_struct"`
+	TimeNil     *time.Time `json:"time_nil"`
+	TimePointer *time.Time `json:"time_pointer"`
+}
+
+var customConfig = jsoniter.Config{
+	EscapeHTML:             true,
+	SortMapKeys:            true,
+	ValidateJsonRawMessage: true,
+}.Froze()
+
+func init() {
+	customConfig.RegisterExtension(&TimeEx{})
+	customConfig.RegisterExtension(&TimePointerEx{})
+}
+
+type customJsonApi struct{}
+
+func (j customJsonApi) Marshal(v any) ([]byte, error) {
+	return customConfig.Marshal(v)
+}
+
+func (j customJsonApi) Unmarshal(data []byte, v any) error {
+	return customConfig.Unmarshal(data, v)
+}
+
+func (j customJsonApi) MarshalIndent(v any, prefix, indent string) ([]byte, error) {
+	return customConfig.MarshalIndent(v, prefix, indent)
+}
+
+func (j customJsonApi) NewEncoder(writer io.Writer) json.Encoder {
+	return customConfig.NewEncoder(writer)
+}
+
+func (j customJsonApi) NewDecoder(reader io.Reader) json.Decoder {
+	return customConfig.NewDecoder(reader)
+}
+
+// region Time Extension
+
+var (
+	zeroTime         = time.Time{}
+	timeType         = reflect2.TypeOfPtr((*time.Time)(nil)).Elem()
+	defaultTimeCodec = &timeCodec{}
+)
+
+type TimeEx struct {
+	jsoniter.DummyExtension
+}
+
+func (te *TimeEx) CreateDecoder(typ reflect2.Type) jsoniter.ValDecoder {
+	if typ == timeType {
+		return defaultTimeCodec
+	}
+	return nil
+}
+
+func (te *TimeEx) CreateEncoder(typ reflect2.Type) jsoniter.ValEncoder {
+	if typ == timeType {
+		return defaultTimeCodec
+	}
+	return nil
+}
+
+type timeCodec struct{}
+
+func (tc timeCodec) IsEmpty(ptr unsafe.Pointer) bool {
+	t := *((*time.Time)(ptr))
+	return t.Equal(zeroTime)
+}
+
+func (tc timeCodec) Encode(ptr unsafe.Pointer, stream *jsoniter.Stream) {
+	t := *((*time.Time)(ptr))
+	if t.Equal(zeroTime) {
+		stream.WriteNil()
+		return
+	}
+	stream.WriteString(t.In(time.Local).Format("2006-01-02 15:04:05.000"))
+}
+
+func (tc timeCodec) Decode(ptr unsafe.Pointer, iter *jsoniter.Iterator) {
+	ts := iter.ReadString()
+	if len(ts) == 0 {
+		*((*time.Time)(ptr)) = zeroTime
+		return
+	}
+	t, err := time.ParseInLocation("2006-01-02 15:04:05.000", ts, time.Local)
+	if err != nil {
+		panic(err)
+	}
+	*((*time.Time)(ptr)) = t
+}
+
+// endregion
+
+// region *Time Extension
+
+var (
+	timePointerType         = reflect2.TypeOfPtr((**time.Time)(nil)).Elem()
+	defaultTimePointerCodec = &timePointerCodec{}
+)
+
+type TimePointerEx struct {
+	jsoniter.DummyExtension
+}
+
+func (tpe *TimePointerEx) CreateDecoder(typ reflect2.Type) jsoniter.ValDecoder {
+	if typ == timePointerType {
+		return defaultTimePointerCodec
+	}
+	return nil
+}
+
+func (tpe *TimePointerEx) CreateEncoder(typ reflect2.Type) jsoniter.ValEncoder {
+	if typ == timePointerType {
+		return defaultTimePointerCodec
+	}
+	return nil
+}
+
+type timePointerCodec struct{}
+
+func (tpc timePointerCodec) IsEmpty(ptr unsafe.Pointer) bool {
+	t := *((**time.Time)(ptr))
+	return t == nil || (*t).Equal(zeroTime)
+}
+
+func (tpc timePointerCodec) Encode(ptr unsafe.Pointer, stream *jsoniter.Stream) {
+	t := *((**time.Time)(ptr))
+	if t == nil || (*t).Equal(zeroTime) {
+		stream.WriteNil()
+		return
+	}
+	stream.WriteString(t.In(time.Local).Format("2006-01-02 15:04:05.000"))
+}
+
+func (tpc timePointerCodec) Decode(ptr unsafe.Pointer, iter *jsoniter.Iterator) {
+	ts := iter.ReadString()
+	if len(ts) == 0 {
+		*((**time.Time)(ptr)) = nil
+		return
+	}
+	t, err := time.ParseInLocation("2006-01-02 15:04:05.000", ts, time.Local)
+	if err != nil {
+		panic(err)
+	}
+	*((**time.Time)(ptr)) = &t
+}
+
+// endregion
--- a/binding/yaml.go
+++ b/binding/yaml.go
@ -9,7 +9,7 @@ import (
 	"io"
 	"net/http"

-	"gopkg.in/yaml.v3"
+	"github.com/goccy/go-yaml"
 )

 type yamlBinding struct{}
--- a/codec/json/api.go
+++ b/codec/json/api.go
@ -0,0 +1,57 @@
+// Copyright 2025 Gin Core Team. All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package json
+
+import "io"
+
+// API the json codec in use.
+var API Core
+
+// Core the api for json codec.
+type Core interface {
+	Marshal(v any) ([]byte, error)
+	Unmarshal(data []byte, v any) error
+	MarshalIndent(v any, prefix, indent string) ([]byte, error)
+	NewEncoder(writer io.Writer) Encoder
+	NewDecoder(reader io.Reader) Decoder
+}
+
+// Encoder an interface writes JSON values to an output stream.
+type Encoder interface {
+	// SetEscapeHTML specifies whether problematic HTML characters
+	// should be escaped inside JSON quoted strings.
+	// The default behavior is to escape &, <, and > to \u0026, \u003c, and \u003e
+	// to avoid certain safety problems that can arise when embedding JSON in HTML.
+	//
+	// In non-HTML settings where the escaping interferes with the readability
+	// of the output, SetEscapeHTML(false) disables this behavior.
+	SetEscapeHTML(on bool)
+
+	// Encode writes the JSON encoding of v to the stream,
+	// followed by a newline character.
+	//
+	// See the documentation for Marshal for details about the
+	// conversion of Go values to JSON.
+	Encode(v any) error
+}
+
+// Decoder an interface reads and decodes JSON values from an input stream.
+type Decoder interface {
+	// UseNumber causes the Decoder to unmarshal a number into an any as a
+	// Number instead of as a float64.
+	UseNumber()
+
+	// DisallowUnknownFields causes the Decoder to return an error when the destination
+	// is a struct and the input contains object keys which do not match any
+	// non-ignored, exported fields in the destination.
+	DisallowUnknownFields()
+
+	// Decode reads the next JSON-encoded value from its
+	// input and stores it in the value pointed to by v.
+	//
+	// See the documentation for Unmarshal for details about
+	// the conversion of JSON into a Go value.
+	Decode(v any) error
+}
--- a/codec/json/go_json.go
+++ b/codec/json/go_json.go
@ -0,0 +1,42 @@
+// Copyright 2025 Gin Core Team. All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+//go:build go_json
+
+package json
+
+import (
+	"io"
+
+	"github.com/goccy/go-json"
+)
+
+// Package indicates what library is being used for JSON encoding.
+const Package = "github.com/goccy/go-json"
+
+func init() {
+	API = gojsonApi{}
+}
+
+type gojsonApi struct{}
+
+func (j gojsonApi) Marshal(v any) ([]byte, error) {
+	return json.Marshal(v)
+}
+
+func (j gojsonApi) Unmarshal(data []byte, v any) error {
+	return json.Unmarshal(data, v)
+}
+
+func (j gojsonApi) MarshalIndent(v any, prefix, indent string) ([]byte, error) {
+	return json.MarshalIndent(v, prefix, indent)
+}
+
+func (j gojsonApi) NewEncoder(writer io.Writer) Encoder {
+	return json.NewEncoder(writer)
+}
+
+func (j gojsonApi) NewDecoder(reader io.Reader) Decoder {
+	return json.NewDecoder(reader)
+}
--- a/codec/json/json.go
+++ b/codec/json/json.go
@ -0,0 +1,41 @@
+// Copyright 2025 Gin Core Team. All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+//go:build !jsoniter && !go_json && !(sonic && (linux || windows || darwin))
+
+package json
+
+import (
+	"encoding/json"
+	"io"
+)
+
+// Package indicates what library is being used for JSON encoding.
+const Package = "encoding/json"
+
+func init() {
+	API = jsonApi{}
+}
+
+type jsonApi struct{}
+
+func (j jsonApi) Marshal(v any) ([]byte, error) {
+	return json.Marshal(v)
+}
+
+func (j jsonApi) Unmarshal(data []byte, v any) error {
+	return json.Unmarshal(data, v)
+}
+
+func (j jsonApi) MarshalIndent(v any, prefix, indent string) ([]byte, error) {
+	return json.MarshalIndent(v, prefix, indent)
+}
+
+func (j jsonApi) NewEncoder(writer io.Writer) Encoder {
+	return json.NewEncoder(writer)
+}
+
+func (j jsonApi) NewDecoder(reader io.Reader) Decoder {
+	return json.NewDecoder(reader)
+}
--- a/codec/json/jsoniter.go
+++ b/codec/json/jsoniter.go
@ -0,0 +1,44 @@
+// Copyright 2025 Gin Core Team. All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+//go:build jsoniter
+
+package json
+
+import (
+	"io"
+
+	jsoniter "github.com/json-iterator/go"
+)
+
+// Package indicates what library is being used for JSON encoding.
+const Package = "github.com/json-iterator/go"
+
+func init() {
+	API = jsoniterApi{}
+}
+
+var json = jsoniter.ConfigCompatibleWithStandardLibrary
+
+type jsoniterApi struct{}
+
+func (j jsoniterApi) Marshal(v any) ([]byte, error) {
+	return json.Marshal(v)
+}
+
+func (j jsoniterApi) Unmarshal(data []byte, v any) error {
+	return json.Unmarshal(data, v)
+}
+
+func (j jsoniterApi) MarshalIndent(v any, prefix, indent string) ([]byte, error) {
+	return json.MarshalIndent(v, prefix, indent)
+}
+
+func (j jsoniterApi) NewEncoder(writer io.Writer) Encoder {
+	return json.NewEncoder(writer)
+}
+
+func (j jsoniterApi) NewDecoder(reader io.Reader) Decoder {
+	return json.NewDecoder(reader)
+}
--- a/codec/json/sonic.go
+++ b/codec/json/sonic.go
@ -0,0 +1,44 @@
+// Copyright 2025 Gin Core Team. All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+//go:build sonic && (linux || windows || darwin)
+
+package json
+
+import (
+	"io"
+
+	"github.com/bytedance/sonic"
+)
+
+// Package indicates what library is being used for JSON encoding.
+const Package = "github.com/bytedance/sonic"
+
+func init() {
+	API = sonicApi{}
+}
+
+var json = sonic.ConfigStd
+
+type sonicApi struct{}
+
+func (j sonicApi) Marshal(v any) ([]byte, error) {
+	return json.Marshal(v)
+}
+
+func (j sonicApi) Unmarshal(data []byte, v any) error {
+	return json.Unmarshal(data, v)
+}
+
+func (j sonicApi) MarshalIndent(v any, prefix, indent string) ([]byte, error) {
+	return json.MarshalIndent(v, prefix, indent)
+}
+
+func (j sonicApi) NewEncoder(writer io.Writer) Encoder {
+	return json.NewEncoder(writer)
+}
+
+func (j sonicApi) NewDecoder(reader io.Reader) Decoder {
+	return json.NewDecoder(reader)
+}
--- a/context.go
+++ b/context.go
@ -216,6 +216,14 @@ func (c *Context) AbortWithStatus(code int) {
 	c.Abort()
 }

+// AbortWithStatusPureJSON calls `Abort()` and then `PureJSON` internally.
+// This method stops the chain, writes the status code and return a JSON body without escaping.
+// It also sets the Content-Type as "application/json".
+func (c *Context) AbortWithStatusPureJSON(code int, jsonObj any) {
+	c.Abort()
+	c.PureJSON(code, jsonObj)
+}
+
 // AbortWithStatusJSON calls `Abort()` and then `JSON` internally.
 // This method stops the chain, writes the status code and return a JSON body.
 // It also sets the Content-Type as "application/json".
@ -565,7 +573,7 @@ func (c *Context) QueryMap(key string) (dicts map[string]string) {
 // whether at least one value exists for the given key.
 func (c *Context) GetQueryMap(key string) (map[string]string, bool) {
 	c.initQueryCache()
-	return c.get(c.queryCache, key)
+	return getMapFromFormData(c.queryCache, key)
 }

 // PostForm returns the specified key from a POST urlencoded form or multipart form
@ -638,22 +646,32 @@ func (c *Context) PostFormMap(key string) (dicts map[string]string) {
 // whether at least one value exists for the given key.
 func (c *Context) GetPostFormMap(key string) (map[string]string, bool) {
 	c.initFormCache()
-	return c.get(c.formCache, key)
+	return getMapFromFormData(c.formCache, key)
 }

-// get is an internal method and returns a map which satisfies conditions.
-func (c *Context) get(m map[string][]string, key string) (map[string]string, bool) {
-	dicts := make(map[string]string)
-	exist := false
+// getMapFromFormData return a map which satisfies conditions.
+// It parses from data with bracket notation like "key[subkey]=value" into a map.
+func getMapFromFormData(m map[string][]string, key string) (map[string]string, bool) {
+	d := make(map[string]string)
+	found := false
+	keyLen := len(key)
+
 	for k, v := range m {
-		if i := strings.IndexByte(k, '['); i >= 1 && k[0:i] == key {
-			if j := strings.IndexByte(k[i+1:], ']'); j >= 1 {
-				exist = true
-				dicts[k[i+1:][:j]] = v[0]
-			}
+		if len(k) < keyLen+3 { // key + "[" + at least one char + "]"
+			continue
+		}
+
+		if k[:keyLen] != key || k[keyLen] != '[' {
+			continue
+		}
+
+		if j := strings.IndexByte(k[keyLen+1:], ']'); j > 0 {
+			found = true
+			d[k[keyLen+1:keyLen+1+j]] = v[0]
 		}
 	}
-	return dicts, exist
+
+	return d, found
 }

 // FormFile returns the first file for the provided form key.
--- a/context_file_test.go
+++ b/context_file_test.go
@ -0,0 +1,35 @@
+package gin
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// TestContextFileSimple tests the Context.File() method with a simple case
+func TestContextFileSimple(t *testing.T) {
+	// Test serving an existing file
+	testFile := "testdata/test_file.txt"
+	w := httptest.NewRecorder()
+	c, _ := CreateTestContext(w)
+	c.Request = httptest.NewRequest(http.MethodGet, "/test", nil)
+
+	c.File(testFile)
+
+	assert.Equal(t, http.StatusOK, w.Code)
+	assert.Contains(t, w.Body.String(), "This is a test file")
+	assert.Equal(t, "text/plain; charset=utf-8", w.Header().Get("Content-Type"))
+}
+
+// TestContextFileNotFound tests serving a non-existent file
+func TestContextFileNotFound(t *testing.T) {
+	w := httptest.NewRecorder()
+	c, _ := CreateTestContext(w)
+	c.Request = httptest.NewRequest(http.MethodGet, "/test", nil)
+
+	c.File("non_existent_file.txt")
+
+	assert.Equal(t, http.StatusNotFound, w.Code)
+}
--- a/context_test.go
+++ b/context_test.go
@ -28,7 +28,7 @@ import (

 	"github.com/gin-contrib/sse"
 	"github.com/gin-gonic/gin/binding"
-	"github.com/gin-gonic/gin/internal/json"
+	"github.com/gin-gonic/gin/codec/json"
 	testdata "github.com/gin-gonic/gin/testdata/protoexample"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@ -75,6 +75,79 @@ func must(err error) {
 	}
 }

+// TestContextFile tests the Context.File() method
+func TestContextFile(t *testing.T) {
+	// Test serving an existing file
+	t.Run("serve existing file", func(t *testing.T) {
+		// Create a temporary test file
+		testFile := "testdata/test_file.txt"
+
+		w := httptest.NewRecorder()
+		c, _ := CreateTestContext(w)
+		c.Request = httptest.NewRequest(http.MethodGet, "/test", nil)
+
+		c.File(testFile)
+
+		assert.Equal(t, http.StatusOK, w.Code)
+		assert.Contains(t, w.Body.String(), "This is a test file")
+		assert.Equal(t, "text/plain; charset=utf-8", w.Header().Get("Content-Type"))
+	})
+
+	// Test serving a non-existent file
+	t.Run("serve non-existent file", func(t *testing.T) {
+		w := httptest.NewRecorder()
+		c, _ := CreateTestContext(w)
+		c.Request = httptest.NewRequest(http.MethodGet, "/test", nil)
+
+		c.File("non_existent_file.txt")
+
+		assert.Equal(t, http.StatusNotFound, w.Code)
+	})
+
+	// Test serving a directory (should return 200 with directory listing or 403 Forbidden)
+	t.Run("serve directory", func(t *testing.T) {
+		w := httptest.NewRecorder()
+		c, _ := CreateTestContext(w)
+		c.Request = httptest.NewRequest(http.MethodGet, "/test", nil)
+
+		c.File(".")
+
+		// Directory serving can return either 200 (with listing) or 403 (forbidden)
+		assert.True(t, w.Code == http.StatusOK || w.Code == http.StatusForbidden)
+	})
+
+	// Test with HEAD request
+	t.Run("HEAD request", func(t *testing.T) {
+		testFile := "testdata/test_file.txt"
+
+		w := httptest.NewRecorder()
+		c, _ := CreateTestContext(w)
+		c.Request = httptest.NewRequest(http.MethodHead, "/test", nil)
+
+		c.File(testFile)
+
+		assert.Equal(t, http.StatusOK, w.Code)
+		assert.Empty(t, w.Body.String()) // HEAD request should not return body
+		assert.Equal(t, "text/plain; charset=utf-8", w.Header().Get("Content-Type"))
+	})
+
+	// Test with Range request
+	t.Run("Range request", func(t *testing.T) {
+		testFile := "testdata/test_file.txt"
+
+		w := httptest.NewRecorder()
+		c, _ := CreateTestContext(w)
+		c.Request = httptest.NewRequest(http.MethodGet, "/test", nil)
+		c.Request.Header.Set("Range", "bytes=0-10")
+
+		c.File(testFile)
+
+		assert.Equal(t, http.StatusPartialContent, w.Code)
+		assert.Equal(t, "bytes", w.Header().Get("Accept-Ranges"))
+		assert.Contains(t, w.Header().Get("Content-Range"), "bytes 0-10")
+	})
+}
+
 func TestContextFormFile(t *testing.T) {
 	buf := new(bytes.Buffer)
 	mw := multipart.NewWriter(buf)
@ -1680,6 +1753,32 @@ func TestContextAbortWithStatusJSON(t *testing.T) {
 	assert.JSONEq(t, "{\"foo\":\"fooValue\",\"bar\":\"barValue\"}", jsonStringBody)
 }

+func TestContextAbortWithStatusPureJSON(t *testing.T) {
+	w := httptest.NewRecorder()
+	c, _ := CreateTestContext(w)
+	c.index = 4
+
+	in := new(testJSONAbortMsg)
+	in.Bar = "barValue"
+	in.Foo = "fooValue"
+
+	c.AbortWithStatusPureJSON(http.StatusUnsupportedMediaType, in)
+
+	assert.Equal(t, abortIndex, c.index)
+	assert.Equal(t, http.StatusUnsupportedMediaType, c.Writer.Status())
+	assert.Equal(t, http.StatusUnsupportedMediaType, w.Code)
+	assert.True(t, c.IsAborted())
+
+	contentType := w.Header().Get("Content-Type")
+	assert.Equal(t, "application/json; charset=utf-8", contentType)
+
+	buf := new(bytes.Buffer)
+	_, err := buf.ReadFrom(w.Body)
+	require.NoError(t, err)
+	jsonStringBody := buf.String()
+	assert.JSONEq(t, "{\"foo\":\"fooValue\",\"bar\":\"barValue\"}", jsonStringBody)
+}
+
 func TestContextError(t *testing.T) {
 	c, _ := CreateTestContext(httptest.NewRecorder())
 	assert.Empty(t, c.Errors)
@ -1892,13 +1991,12 @@ func TestContextContentType(t *testing.T) {
 }

 func TestContextBindRequestTooLarge(t *testing.T) {
-	// When using sonic or go-json as JSON encoder, they do not propagate the http.MaxBytesError error
+	// When using go-json as JSON encoder, they do not propagate the http.MaxBytesError error
 	// The response will fail with a generic 400 instead of 413
 	// https://github.com/goccy/go-json/issues/485
-	// https://github.com/bytedance/sonic/issues/800
 	var expectedCode int
 	switch json.Package {
-	case "github.com/goccy/go-json", "github.com/bytedance/sonic":
+	case "github.com/goccy/go-json":
 		expectedCode = http.StatusBadRequest
 	default:
 		expectedCode = http.StatusRequestEntityTooLarge
@ -3324,3 +3422,219 @@ func TestContextSetCookieData(t *testing.T) {
 		assert.Contains(t, setCookie, "SameSite=None")
 	})
 }
+
+func TestGetMapFromFormData(t *testing.T) {
+	testCases := []struct {
+		name     string
+		data     map[string][]string
+		key      string
+		expected map[string]string
+		found    bool
+	}{
+		{
+			name: "Basic bracket notation",
+			data: map[string][]string{
+				"ids[a]": {"hi"},
+				"ids[b]": {"3.14"},
+			},
+			key: "ids",
+			expected: map[string]string{
+				"a": "hi",
+				"b": "3.14",
+			},
+			found: true,
+		},
+		{
+			name: "Mixed data with bracket notation",
+			data: map[string][]string{
+				"ids[a]":     {"hi"},
+				"ids[b]":     {"3.14"},
+				"names[a]":   {"mike"},
+				"names[b]":   {"maria"},
+				"other[key]": {"value"},
+				"simple":     {"data"},
+			},
+			key: "ids",
+			expected: map[string]string{
+				"a": "hi",
+				"b": "3.14",
+			},
+			found: true,
+		},
+		{
+			name: "Names key",
+			data: map[string][]string{
+				"ids[a]":     {"hi"},
+				"ids[b]":     {"3.14"},
+				"names[a]":   {"mike"},
+				"names[b]":   {"maria"},
+				"other[key]": {"value"},
+			},
+			key: "names",
+			expected: map[string]string{
+				"a": "mike",
+				"b": "maria",
+			},
+			found: true,
+		},
+		{
+			name: "Key not found",
+			data: map[string][]string{
+				"ids[a]":   {"hi"},
+				"names[b]": {"maria"},
+			},
+			key:      "notfound",
+			expected: map[string]string{},
+			found:    false,
+		},
+		{
+			name:     "Empty data",
+			data:     map[string][]string{},
+			key:      "ids",
+			expected: map[string]string{},
+			found:    false,
+		},
+		{
+			name: "Malformed bracket notation",
+			data: map[string][]string{
+				"ids[a": {"hi"},    // Missing closing bracket
+				"ids]b": {"3.14"},  // Missing opening bracket
+				"idsab": {"value"}, // No brackets
+			},
+			key:      "ids",
+			expected: map[string]string{},
+			found:    false,
+		},
+		{
+			name: "Nested bracket notation",
+			data: map[string][]string{
+				"ids[a][b]": {"nested"},
+				"ids[c]":    {"simple"},
+			},
+			key: "ids",
+			expected: map[string]string{
+				"a": "nested",
+				"c": "simple",
+			},
+			found: true,
+		},
+		{
+			name: "Simple key without brackets",
+			data: map[string][]string{
+				"simple": {"data"},
+				"ids[a]": {"hi"},
+			},
+			key:      "simple",
+			expected: map[string]string{},
+			found:    false,
+		},
+		{
+			name: "Mixed simple and bracket keys",
+			data: map[string][]string{
+				"simple": {"data"},
+				"ids[a]": {"hi"},
+				"ids[b]": {"3.14"},
+				"other":  {"value"},
+			},
+			key: "ids",
+			expected: map[string]string{
+				"a": "hi",
+				"b": "3.14",
+			},
+			found: true,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			result, found := getMapFromFormData(tc.data, tc.key)
+			assert.Equal(t, tc.expected, result, "result mismatch")
+			assert.Equal(t, tc.found, found, "found mismatch")
+		})
+	}
+}
+
+func BenchmarkGetMapFromFormData(b *testing.B) {
+	// Test case 1: Small dataset with bracket notation
+	smallData := map[string][]string{
+		"ids[a]":   {"hi"},
+		"ids[b]":   {"3.14"},
+		"names[a]": {"mike"},
+		"names[b]": {"maria"},
+	}
+
+	// Test case 2: Medium dataset with mixed data
+	mediumData := map[string][]string{
+		"ids[a]":      {"hi"},
+		"ids[b]":      {"3.14"},
+		"ids[c]":      {"test"},
+		"ids[d]":      {"value"},
+		"names[a]":    {"mike"},
+		"names[b]":    {"maria"},
+		"names[c]":    {"john"},
+		"names[d]":    {"jane"},
+		"other[key1]": {"value1"},
+		"other[key2]": {"value2"},
+		"simple":      {"data"},
+		"another":     {"info"},
+	}
+
+	// Test case 3: Large dataset with many bracket keys
+	largeData := make(map[string][]string)
+	for i := 0; i < 100; i++ {
+		key := fmt.Sprintf("ids[%d]", i)
+		largeData[key] = []string{fmt.Sprintf("value%d", i)}
+	}
+	for i := 0; i < 50; i++ {
+		key := fmt.Sprintf("names[%d]", i)
+		largeData[key] = []string{fmt.Sprintf("name%d", i)}
+	}
+	for i := 0; i < 25; i++ {
+		key := fmt.Sprintf("other[key%d]", i)
+		largeData[key] = []string{fmt.Sprintf("other%d", i)}
+	}
+
+	// Test case 4: Dataset with many non-matching keys (worst case)
+	worstCaseData := make(map[string][]string)
+	for i := 0; i < 100; i++ {
+		key := fmt.Sprintf("nonmatching%d", i)
+		worstCaseData[key] = []string{fmt.Sprintf("value%d", i)}
+	}
+	worstCaseData["ids[a]"] = []string{"hi"}
+	worstCaseData["ids[b]"] = []string{"3.14"}
+
+	// Test case 5: Dataset with short keys (best case for early exit)
+	shortKeysData := map[string][]string{
+		"a":      {"value1"},
+		"b":      {"value2"},
+		"ids[a]": {"hi"},
+		"ids[b]": {"3.14"},
+	}
+
+	benchmarks := []struct {
+		name string
+		data map[string][]string
+		key  string
+	}{
+		{"Small_Bracket", smallData, "ids"},
+		{"Small_Names", smallData, "names"},
+		{"Medium_Bracket", mediumData, "ids"},
+		{"Medium_Names", mediumData, "names"},
+		{"Medium_Other", mediumData, "other"},
+		{"Large_Bracket", largeData, "ids"},
+		{"Large_Names", largeData, "names"},
+		{"Large_Other", largeData, "other"},
+		{"WorstCase_Bracket", worstCaseData, "ids"},
+		{"ShortKeys_Bracket", shortKeysData, "ids"},
+		{"Empty_Key", smallData, "notfound"},
+	}
+
+	for _, bm := range benchmarks {
+		b.Run(bm.name, func(b *testing.B) {
+			b.ReportAllocs()
+			for i := 0; i < b.N; i++ {
+				_, _ = getMapFromFormData(bm.data, bm.key)
+			}
+		})
+	}
+}
--- a/debug.go
+++ b/debug.go
@ -13,7 +13,7 @@ import (
 	"sync/atomic"
 )

-const ginSupportMinGoVer = 21
+const ginSupportMinGoVer = 23

 // IsDebugging returns true if the framework is running in debug mode.
 // Use SetMode(gin.ReleaseMode) to disable debug mode.
--- a/doc.go
+++ b/doc.go
@ -2,5 +2,21 @@
 Package gin implements a HTTP web framework called gin.

 See https://gin-gonic.com/ for more information about gin.
+
+Example:
+
+	package main
+
+	import "github.com/gin-gonic/gin"
+
+	func main() {
+		r := gin.Default()
+		r.GET("/ping", func(c *gin.Context) {
+			c.JSON(200, gin.H{
+				"message": "pong",
+			})
+		})
+		r.Run() // listen and serve on 0.0.0.0:8080
+	}
 */
 package gin // import "github.com/gin-gonic/gin"
--- a/docs/doc.md
+++ b/docs/doc.md
@ -63,6 +63,7 @@
  - [http2 server push](#http2-server-push)
  - [Define format for the log of routes](#define-format-for-the-log-of-routes)
  - [Set and get a cookie](#set-and-get-a-cookie)
+  - [Custom json codec at runtime](#custom-json-codec-at-runtime)
 - [Don't trust all proxies](#dont-trust-all-proxies)
 - [Testing](#testing)

@ -872,7 +873,7 @@ curl -X GET "localhost:8085/testing?name=appleboy&address=xyz&birthday=1992-03-1

 If the server should bind a default value to a field when the client does not provide one, specify the default value using the `default` key within the `form` tag:

-```
+```go
 package main

 import (
@ -2371,6 +2372,65 @@ func main() {
 }
 ```

+### Custom json codec at runtime
+
+Gin support custom json serialization and deserialization logic without using compile tags.
+
+1. Define a custom struct implements the `json.Core` interface.
+
+2. Before your engine starts, assign values to `json.API` using the custom struct.
+
+```go
+package main
+
+import (
+  "io"
+
+  "github.com/gin-gonic/gin"
+  "github.com/gin-gonic/gin/codec/json"
+  jsoniter "github.com/json-iterator/go"
+)
+
+var customConfig = jsoniter.Config{
+  EscapeHTML:             true,
+  SortMapKeys:            true,
+  ValidateJsonRawMessage: true,
+}.Froze()
+
+// implement api.JsonApi
+type customJsonApi struct {
+}
+
+func (j customJsonApi) Marshal(v any) ([]byte, error) {
+  return customConfig.Marshal(v)
+}
+
+func (j customJsonApi) Unmarshal(data []byte, v any) error {
+  return customConfig.Unmarshal(data, v)
+}
+
+func (j customJsonApi) MarshalIndent(v any, prefix, indent string) ([]byte, error) {
+  return customConfig.MarshalIndent(v, prefix, indent)
+}
+
+func (j customJsonApi) NewEncoder(writer io.Writer) json.Encoder {
+  return customConfig.NewEncoder(writer)
+}
+
+func (j customJsonApi) NewDecoder(reader io.Reader) json.Decoder {
+  return customConfig.NewDecoder(reader)
+}
+
+func main() {
+  //Replace the default json api
+  json.API = customJsonApi{}
+
+  //Start your gin engine
+  router := gin.Default()
+  router.Run(":8080")
+}
+```
+
 ## Don't trust all proxies

 Gin lets you specify which headers to hold the real client IP (if any),
--- a/errors.go
+++ b/errors.go
@ -9,7 +9,7 @@ import (
 	"reflect"
 	"strings"

-	"github.com/gin-gonic/gin/internal/json"
+	"github.com/gin-gonic/gin/codec/json"
 )

 // ErrorType is an unsigned 64-bit error code as defined in the gin spec.
@ -77,7 +77,7 @@ func (msg *Error) JSON() any {

 // MarshalJSON implements the json.Marshaller interface.
 func (msg *Error) MarshalJSON() ([]byte, error) {
-	return json.Marshal(msg.JSON())
+	return json.API.Marshal(msg.JSON())
 }

 // Error implements the error interface.
@ -157,7 +157,7 @@ func (a errorMsgs) JSON() any {

 // MarshalJSON implements the json.Marshaller interface.
 func (a errorMsgs) MarshalJSON() ([]byte, error) {
-	return json.Marshal(a.JSON())
+	return json.API.Marshal(a.JSON())
 }

 func (a errorMsgs) String() string {
--- a/errors_test.go
+++ b/errors_test.go
@ -9,7 +9,7 @@ import (
 	"fmt"
 	"testing"

-	"github.com/gin-gonic/gin/internal/json"
+	"github.com/gin-gonic/gin/codec/json"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@ -33,7 +33,7 @@ func TestError(t *testing.T) {
 		"meta":  "some data",
 	}, err.JSON())

-	jsonBytes, _ := json.Marshal(err)
+	jsonBytes, _ := json.API.Marshal(err)
 	assert.JSONEq(t, "{\"error\":\"test error\",\"meta\":\"some data\"}", string(jsonBytes))

 	err.SetMeta(H{ //nolint: errcheck
@ -92,13 +92,13 @@ Error #03: third
 		H{"error": "second", "meta": "some data"},
 		H{"error": "third", "status": "400"},
 	}, errs.JSON())
-	jsonBytes, _ := json.Marshal(errs)
+	jsonBytes, _ := json.API.Marshal(errs)
 	assert.JSONEq(t, "[{\"error\":\"first\"},{\"error\":\"second\",\"meta\":\"some data\"},{\"error\":\"third\",\"status\":\"400\"}]", string(jsonBytes))
 	errs = errorMsgs{
 		{Err: errors.New("first"), Type: ErrorTypePrivate},
 	}
 	assert.Equal(t, H{"error": "first"}, errs.JSON())
-	jsonBytes, _ = json.Marshal(errs)
+	jsonBytes, _ = json.API.Marshal(errs)
 	assert.JSONEq(t, "{\"error\":\"first\"}", string(jsonBytes))

 	errs = errorMsgs{}
--- a/go.mod
+++ b/go.mod
@ -3,44 +3,42 @@ module github.com/gin-gonic/gin
 go 1.23.0

 require (
-	github.com/bytedance/sonic v1.13.2
+	github.com/bytedance/sonic v1.14.0
 	github.com/gin-contrib/sse v1.1.0
-	github.com/go-playground/validator/v10 v10.26.0
+	github.com/go-playground/validator/v10 v10.27.0
 	github.com/goccy/go-json v0.10.2
+	github.com/goccy/go-yaml v1.18.0
 	github.com/json-iterator/go v1.1.12
 	github.com/mattn/go-isatty v0.0.20
+	github.com/modern-go/reflect2 v1.0.2
 	github.com/pelletier/go-toml/v2 v2.2.4
-	github.com/quic-go/quic-go v0.52.0
-	github.com/stretchr/testify v1.10.0
-	github.com/ugorji/go/codec v1.2.12
-	golang.org/x/net v0.40.0
-	google.golang.org/protobuf v1.36.6
-	gopkg.in/yaml.v3 v3.0.1
+	github.com/quic-go/quic-go v0.54.0
+	github.com/stretchr/testify v1.11.1
+	github.com/ugorji/go/codec v1.3.0
+	golang.org/x/net v0.42.0
+	google.golang.org/protobuf v1.36.9
 )

 require (
-	github.com/bytedance/sonic/loader v0.2.4 // indirect
-	github.com/cloudwego/base64x v0.1.5 // indirect
+	github.com/bytedance/sonic/loader v0.3.0 // indirect
+	github.com/cloudwego/base64x v0.1.6 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/gabriel-vasile/mimetype v1.4.8 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
-	github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
-	github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 // indirect
-	github.com/klauspost/cpuid/v2 v2.0.9 // indirect
+	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 // indirect
-	github.com/modern-go/reflect2 v1.0.2 // indirect
-	github.com/onsi/ginkgo/v2 v2.9.5 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/quic-go/qpack v0.5.1 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	go.uber.org/mock v0.5.0 // indirect
-	golang.org/x/arch v0.0.0-20210923205945-b76863e36670 // indirect
-	golang.org/x/crypto v0.38.0 // indirect
-	golang.org/x/mod v0.18.0 // indirect
-	golang.org/x/sync v0.14.0 // indirect
-	golang.org/x/sys v0.33.0 // indirect
-	golang.org/x/text v0.25.0 // indirect
-	golang.org/x/tools v0.22.0 // indirect
+	golang.org/x/arch v0.20.0 // indirect
+	golang.org/x/crypto v0.40.0 // indirect
+	golang.org/x/mod v0.25.0 // indirect
+	golang.org/x/sync v0.16.0 // indirect
+	golang.org/x/sys v0.35.0 // indirect
+	golang.org/x/text v0.27.0 // indirect
+	golang.org/x/tools v0.34.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
--- a/go.sum
+++ b/go.sum
@ -1,14 +1,9 @@
-github.com/bytedance/sonic v1.13.2 h1:8/H1FempDZqC4VqjptGo14QQlJx8VdZJegxs6wwfqpQ=
-github.com/bytedance/sonic v1.13.2/go.mod h1:o68xyaF9u2gvVBuGHPlUVCy+ZfmNNO5ETf1+KgkJhz4=
-github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
-github.com/bytedance/sonic/loader v0.2.4 h1:ZWCw4stuXUsn1/+zQDqeE7JKP+QO47tz7QCNan80NzY=
-github.com/bytedance/sonic/loader v0.2.4/go.mod h1:N8A3vUdtUebEY2/VQC0MyhYeKUFosQU6FxH2JmUe6VI=
-github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
-github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
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@ -16,33 +11,25 @@ github.com/gabriel-vasile/mimetype v1.4.8 h1:FfZ3gj38NjllZIeJAmMhr+qKL8Wu+nOoI3G
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 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-nullprogram.com/x/optparse v1.0.0/go.mod h1:KdyPE+Igbe0jQUrVfMqDMeJQIJZEuyV7pjYmp6pbG50=
--- a/internal/json/go_json.go
+++ b/internal/json/go_json.go
@ -1,25 +0,0 @@
-// Copyright 2017 Bo-Yi Wu. All rights reserved.
-// Use of this source code is governed by a MIT style
-// license that can be found in the LICENSE file.
-
-//go:build go_json
-
-package json
-
-import json "github.com/goccy/go-json"
-
-var (
-	// Marshal is exported by gin/json package.
-	Marshal = json.Marshal
-	// Unmarshal is exported by gin/json package.
-	Unmarshal = json.Unmarshal
-	// MarshalIndent is exported by gin/json package.
-	MarshalIndent = json.MarshalIndent
-	// NewDecoder is exported by gin/json package.
-	NewDecoder = json.NewDecoder
-	// NewEncoder is exported by gin/json package.
-	NewEncoder = json.NewEncoder
-)
-
-// Package indicates what library is being used for JSON encoding.
-const Package = "github.com/goccy/go-json"
--- a/internal/json/json.go
+++ b/internal/json/json.go
@ -1,25 +0,0 @@
-// Copyright 2017 Bo-Yi Wu. All rights reserved.
-// Use of this source code is governed by a MIT style
-// license that can be found in the LICENSE file.
-
-//go:build !jsoniter && !go_json && !(sonic && (linux || windows || darwin))
-
-package json
-
-import "encoding/json"
-
-var (
-	// Marshal is exported by gin/json package.
-	Marshal = json.Marshal
-	// Unmarshal is exported by gin/json package.
-	Unmarshal = json.Unmarshal
-	// MarshalIndent is exported by gin/json package.
-	MarshalIndent = json.MarshalIndent
-	// NewDecoder is exported by gin/json package.
-	NewDecoder = json.NewDecoder
-	// NewEncoder is exported by gin/json package.
-	NewEncoder = json.NewEncoder
-)
-
-// Package indicates what library is being used for JSON encoding.
-const Package = "encoding/json"
--- a/internal/json/jsoniter.go
+++ b/internal/json/jsoniter.go
@ -1,26 +0,0 @@
-// Copyright 2017 Bo-Yi Wu. All rights reserved.
-// Use of this source code is governed by a MIT style
-// license that can be found in the LICENSE file.
-
-//go:build jsoniter
-
-package json
-
-import jsoniter "github.com/json-iterator/go"
-
-var (
-	json = jsoniter.ConfigCompatibleWithStandardLibrary
-	// Marshal is exported by gin/json package.
-	Marshal = json.Marshal
-	// Unmarshal is exported by gin/json package.
-	Unmarshal = json.Unmarshal
-	// MarshalIndent is exported by gin/json package.
-	MarshalIndent = json.MarshalIndent
-	// NewDecoder is exported by gin/json package.
-	NewDecoder = json.NewDecoder
-	// NewEncoder is exported by gin/json package.
-	NewEncoder = json.NewEncoder
-)
-
-// Package indicates what library is being used for JSON encoding.
-const Package = "github.com/json-iterator/go"
--- a/internal/json/sonic.go
+++ b/internal/json/sonic.go
@ -1,26 +0,0 @@
-// Copyright 2022 Gin Core Team. All rights reserved.
-// Use of this source code is governed by a MIT style
-// license that can be found in the LICENSE file.
-
-//go:build sonic && (linux || windows || darwin)
-
-package json
-
-import "github.com/bytedance/sonic"
-
-var (
-	json = sonic.ConfigStd
-	// Marshal is exported by gin/json package.
-	Marshal = json.Marshal
-	// Unmarshal is exported by gin/json package.
-	Unmarshal = json.Unmarshal
-	// MarshalIndent is exported by gin/json package.
-	MarshalIndent = json.MarshalIndent
-	// NewDecoder is exported by gin/json package.
-	NewDecoder = json.NewDecoder
-	// NewEncoder is exported by gin/json package.
-	NewEncoder = json.NewEncoder
-)
-
-// Package indicates what library is being used for JSON encoding.
-const Package = "github.com/bytedance/sonic"
--- a/logger.go
+++ b/logger.go
@ -44,7 +44,7 @@ type LoggerConfig struct {
 	// Optional. Default value is gin.DefaultWriter.
 	Output io.Writer

-	// SkipPaths is an url path array which logs are not written.
+	// SkipPaths is a URL path array which logs are not written.
 	// Optional.
 	SkipPaths []string

--- a/mode.go
+++ b/mode.go
@ -65,7 +65,7 @@ func SetMode(value string) {
 	}

 	switch value {
-	case DebugMode, "":
+	case DebugMode:
 		atomic.StoreInt32(&ginMode, debugCode)
 	case ReleaseMode:
 		atomic.StoreInt32(&ginMode, releaseCode)
--- a/recovery.go
+++ b/recovery.go
@ -17,6 +17,8 @@ import (
 	"runtime"
 	"strings"
 	"time"
+
+	"github.com/gin-gonic/gin/internal/bytesconv"
 )

 const dunno = "???"
@ -67,19 +69,15 @@ func CustomRecoveryWithWriter(out io.Writer, handle RecoveryFunc) HandlerFunc {
 					}
 				}
 				if logger != nil {
-					stack := stack(3)
-					httpRequest, _ := httputil.DumpRequest(c.Request, false)
-					headers := strings.Split(string(httpRequest), "\r\n")
-					maskAuthorization(headers)
-					headersToStr := strings.Join(headers, "\r\n")
+					const stackSkip = 3
 					if brokenPipe {
-						logger.Printf("%s\n%s%s", err, headersToStr, reset)
+						logger.Printf("%s\n%s%s", err, secureRequestDump(c.Request), reset)
 					} else if IsDebugging() {
 						logger.Printf("[Recovery] %s panic recovered:\n%s\n%s\n%s%s",
-							timeFormat(time.Now()), headersToStr, err, stack, reset)
+							timeFormat(time.Now()), secureRequestDump(c.Request), err, stack(stackSkip), reset)
 					} else {
 						logger.Printf("[Recovery] %s panic recovered:\n%s\n%s%s",
-							timeFormat(time.Now()), err, stack, reset)
+							timeFormat(time.Now()), err, stack(stackSkip), reset)
 					}
 				}
 				if brokenPipe {
@ -95,6 +93,21 @@ func CustomRecoveryWithWriter(out io.Writer, handle RecoveryFunc) HandlerFunc {
 	}
 }

+// secureRequestDump returns a sanitized HTTP request dump where the Authorization header,
+// if present, is replaced with a masked value ("Authorization: *") to avoid leaking sensitive credentials.
+//
+// Currently, only the Authorization header is sanitized. All other headers and request data remain unchanged.
+func secureRequestDump(r *http.Request) string {
+	httpRequest, _ := httputil.DumpRequest(r, false)
+	lines := strings.Split(bytesconv.BytesToString(httpRequest), "\r\n")
+	for i, line := range lines {
+		if strings.HasPrefix(line, "Authorization:") {
+			lines[i] = "Authorization: *"
+		}
+	}
+	return strings.Join(lines, "\r\n")
+}
+
 func defaultHandleRecovery(c *Context, _ any) {
 	c.AbortWithStatus(http.StatusInternalServerError)
 }
@ -126,16 +139,6 @@ func stack(skip int) []byte {
 	return buf.Bytes()
 }

-// maskAuthorization replaces any "Authorization: <token>" header with "Authorization: *", hiding sensitive credentials.
-func maskAuthorization(headers []string) {
-	for idx, header := range headers {
-		key, _, _ := strings.Cut(header, ":")
-		if strings.EqualFold(key, "Authorization") {
-			headers[idx] = key + ": *"
-		}
-	}
-}
-
 // source returns a space-trimmed slice of the n'th line.
 func source(lines [][]byte, n int) []byte {
 	n-- // in stack trace, lines are 1-indexed but our array is 0-indexed
--- a/recovery_test.go
+++ b/recovery_test.go
@ -88,24 +88,6 @@ func TestPanicWithAbort(t *testing.T) {
 	assert.Equal(t, http.StatusBadRequest, w.Code)
 }

-func TestMaskAuthorization(t *testing.T) {
-	secret := "Bearer aaaabbbbccccddddeeeeffff"
-	headers := []string{
-		"Host: www.example.com",
-		"Authorization: " + secret,
-		"User-Agent: curl/7.51.0",
-		"Accept: */*",
-		"Content-Type: application/json",
-		"Content-Length: 1",
-	}
-	maskAuthorization(headers)
-
-	for _, h := range headers {
-		assert.NotContains(t, h, secret)
-	}
-	assert.Contains(t, headers, "Authorization: *")
-}
-
 func TestSource(t *testing.T) {
 	bs := source(nil, 0)
 	assert.Equal(t, dunnoBytes, bs)
@ -263,3 +245,65 @@ func TestRecoveryWithWriterWithCustomRecovery(t *testing.T) {

 	SetMode(TestMode)
 }
+
+func TestSecureRequestDump(t *testing.T) {
+	tests := []struct {
+		name           string
+		req            *http.Request
+		wantContains   string
+		wantNotContain string
+	}{
+		{
+			name: "Authorization header standard case",
+			req: func() *http.Request {
+				r, _ := http.NewRequest(http.MethodGet, "http://example.com", nil)
+				r.Header.Set("Authorization", "Bearer secret-token")
+				return r
+			}(),
+			wantContains:   "Authorization: *",
+			wantNotContain: "Bearer secret-token",
+		},
+		{
+			name: "authorization header lowercase",
+			req: func() *http.Request {
+				r, _ := http.NewRequest(http.MethodGet, "http://example.com", nil)
+				r.Header.Set("authorization", "some-secret")
+				return r
+			}(),
+			wantContains:   "Authorization: *",
+			wantNotContain: "some-secret",
+		},
+		{
+			name: "Authorization header mixed case",
+			req: func() *http.Request {
+				r, _ := http.NewRequest(http.MethodGet, "http://example.com", nil)
+				r.Header.Set("AuThOrIzAtIoN", "token123")
+				return r
+			}(),
+			wantContains:   "Authorization: *",
+			wantNotContain: "token123",
+		},
+		{
+			name: "No Authorization header",
+			req: func() *http.Request {
+				r, _ := http.NewRequest(http.MethodGet, "http://example.com", nil)
+				r.Header.Set("Content-Type", "application/json")
+				return r
+			}(),
+			wantContains:   "",
+			wantNotContain: "Authorization: *",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := secureRequestDump(tt.req)
+			if tt.wantContains != "" && !strings.Contains(result, tt.wantContains) {
+				t.Errorf("maskHeaders() = %q, want contains %q", result, tt.wantContains)
+			}
+			if tt.wantNotContain != "" && strings.Contains(result, tt.wantNotContain) {
+				t.Errorf("maskHeaders() = %q, want NOT contain %q", result, tt.wantNotContain)
+			}
+		})
+	}
+}
--- a/render/json.go
+++ b/render/json.go
@ -11,8 +11,8 @@ import (
 	"net/http"
 	"unicode"

+	"github.com/gin-gonic/gin/codec/json"
 	"github.com/gin-gonic/gin/internal/bytesconv"
-	"github.com/gin-gonic/gin/internal/json"
 )

 // JSON contains the given interface object.
@ -66,7 +66,7 @@ func (r JSON) WriteContentType(w http.ResponseWriter) {
 // WriteJSON marshals the given interface object and writes it with custom ContentType.
 func WriteJSON(w http.ResponseWriter, obj any) error {
 	writeContentType(w, jsonContentType)
-	jsonBytes, err := json.Marshal(obj)
+	jsonBytes, err := json.API.Marshal(obj)
 	if err != nil {
 		return err
 	}
@ -77,7 +77,7 @@ func WriteJSON(w http.ResponseWriter, obj any) error {
 // Render (IndentedJSON) marshals the given interface object and writes it with custom ContentType.
 func (r IndentedJSON) Render(w http.ResponseWriter) error {
 	r.WriteContentType(w)
-	jsonBytes, err := json.MarshalIndent(r.Data, "", "    ")
+	jsonBytes, err := json.API.MarshalIndent(r.Data, "", "    ")
 	if err != nil {
 		return err
 	}
@ -93,7 +93,7 @@ func (r IndentedJSON) WriteContentType(w http.ResponseWriter) {
 // Render (SecureJSON) marshals the given interface object and writes it with custom ContentType.
 func (r SecureJSON) Render(w http.ResponseWriter) error {
 	r.WriteContentType(w)
-	jsonBytes, err := json.Marshal(r.Data)
+	jsonBytes, err := json.API.Marshal(r.Data)
 	if err != nil {
 		return err
 	}
@ -116,7 +116,7 @@ func (r SecureJSON) WriteContentType(w http.ResponseWriter) {
 // Render (JsonpJSON) marshals the given interface object and writes it and its callback with custom ContentType.
 func (r JsonpJSON) Render(w http.ResponseWriter) (err error) {
 	r.WriteContentType(w)
-	ret, err := json.Marshal(r.Data)
+	ret, err := json.API.Marshal(r.Data)
 	if err != nil {
 		return err
 	}
@ -154,7 +154,7 @@ func (r JsonpJSON) WriteContentType(w http.ResponseWriter) {
 // Render (AsciiJSON) marshals the given interface object and writes it with custom ContentType.
 func (r AsciiJSON) Render(w http.ResponseWriter) error {
 	r.WriteContentType(w)
-	ret, err := json.Marshal(r.Data)
+	ret, err := json.API.Marshal(r.Data)
 	if err != nil {
 		return err
 	}
@ -183,7 +183,7 @@ func (r AsciiJSON) WriteContentType(w http.ResponseWriter) {
 // Render (PureJSON) writes custom ContentType and encodes the given interface object.
 func (r PureJSON) Render(w http.ResponseWriter) error {
 	r.WriteContentType(w)
-	encoder := json.NewEncoder(w)
+	encoder := json.API.NewEncoder(w)
 	encoder.SetEscapeHTML(false)
 	return encoder.Encode(r.Data)
 }
--- a/render/reader.go
+++ b/render/reader.go
@ -27,7 +27,7 @@ func (r Reader) Render(w http.ResponseWriter) (err error) {
 		}
 		r.Headers["Content-Length"] = strconv.FormatInt(r.ContentLength, 10)
 	}
-	r.writeHeaders(w, r.Headers)
+	r.writeHeaders(w)
 	_, err = io.Copy(w, r.Reader)
 	return
 }
@ -37,10 +37,10 @@ func (r Reader) WriteContentType(w http.ResponseWriter) {
 	writeContentType(w, []string{r.ContentType})
 }

-// writeHeaders writes custom Header.
-func (r Reader) writeHeaders(w http.ResponseWriter, headers map[string]string) {
+// writeHeaders writes headers from r.Headers into response.
+func (r Reader) writeHeaders(w http.ResponseWriter) {
 	header := w.Header()
-	for k, v := range headers {
+	for k, v := range r.Headers {
 		if header.Get(k) == "" {
 			header.Set(k, v)
 		}
--- a/render/render_test.go
+++ b/render/render_test.go
@ -15,7 +15,7 @@ import (
 	"strings"
 	"testing"

-	"github.com/gin-gonic/gin/internal/json"
+	"github.com/gin-gonic/gin/codec/json"
 	testdata "github.com/gin-gonic/gin/testdata/protoexample"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@ -173,7 +173,7 @@ func TestRenderJsonpJSONError(t *testing.T) {
 	err = jsonpJSON.Render(ew)
 	assert.Equal(t, `write "`+`(`+`" error`, err.Error())

-	data, _ := json.Marshal(jsonpJSON.Data) // error was returned while writing data
+	data, _ := json.API.Marshal(jsonpJSON.Data) // error was returned while writing data
 	ew.bufString = string(data)
 	err = jsonpJSON.Render(ew)
 	assert.Equal(t, `write "`+string(data)+`" error`, err.Error())
@ -285,7 +285,14 @@ b:

 	err := (YAML{data}).Render(w)
 	require.NoError(t, err)
-	assert.Equal(t, "|4-\n    a : Easy!\n    b:\n    \tc: 2\n    \td: [3, 4]\n    \t\n", w.Body.String())
+
+	// With github.com/goccy/go-yaml, the output format is different from gopkg.in/yaml.v3
+	// We're checking that the output contains the expected data, not the exact formatting
+	output := w.Body.String()
+	assert.Contains(t, output, "a : Easy!")
+	assert.Contains(t, output, "b:")
+	assert.Contains(t, output, "c: 2")
+	assert.Contains(t, output, "d: [3, 4]")
 	assert.Equal(t, "application/yaml; charset=utf-8", w.Header().Get("Content-Type"))
 }

--- a/render/toml.go
+++ b/render/toml.go
@ -15,7 +15,7 @@ type TOML struct {
 	Data any
 }

-var TOMLContentType = []string{"application/toml; charset=utf-8"}
+var tomlContentType = []string{"application/toml; charset=utf-8"}

 // Render (TOML) marshals the given interface object and writes data with custom ContentType.
 func (r TOML) Render(w http.ResponseWriter) error {
@ -32,5 +32,5 @@ func (r TOML) Render(w http.ResponseWriter) error {

 // WriteContentType (TOML) writes TOML ContentType for response.
 func (r TOML) WriteContentType(w http.ResponseWriter) {
-	writeContentType(w, TOMLContentType)
+	writeContentType(w, tomlContentType)
 }
--- a/render/yaml.go
+++ b/render/yaml.go
@ -7,7 +7,7 @@ package render
 import (
 	"net/http"

-	"gopkg.in/yaml.v3"
+	"github.com/goccy/go-yaml"
 )

 // YAML contains the given interface object.
--- a/response_writer.go
+++ b/response_writer.go
@ -6,6 +6,7 @@ package gin

 import (
 	"bufio"
+	"errors"
 	"io"
 	"net"
 	"net/http"
@ -16,6 +17,8 @@ const (
 	defaultStatus = http.StatusOK
 )

+var errHijackAlreadyWritten = errors.New("gin: response already written")
+
 // ResponseWriter ...
 type ResponseWriter interface {
 	http.ResponseWriter
@ -106,6 +109,9 @@ func (w *responseWriter) Written() bool {

 // Hijack implements the http.Hijacker interface.
 func (w *responseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	if w.Written() {
+		return nil, nil, errHijackAlreadyWritten
+	}
 	if w.size < 0 {
 		w.size = 0
 	}
--- a/response_writer_test.go
+++ b/response_writer_test.go
@ -5,6 +5,8 @@
 package gin

 import (
+	"bufio"
+	"net"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@ -124,6 +126,74 @@ func TestResponseWriterHijack(t *testing.T) {
 	w.Flush()
 }

+type mockHijacker struct {
+	*httptest.ResponseRecorder
+	hijacked bool
+}
+
+// Hijack implements the http.Hijacker interface. It just records that it was called.
+func (m *mockHijacker) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	m.hijacked = true
+	return nil, nil, nil
+}
+
+func TestResponseWriterHijackAfterWrite(t *testing.T) {
+	tests := []struct {
+		name                      string
+		action                    func(w ResponseWriter) error // Action to perform before hijacking
+		expectWrittenBeforeHijack bool
+		expectHijackSuccess       bool
+		expectWrittenAfterHijack  bool
+		expectError               error
+	}{
+		{
+			name:                      "hijack before write should succeed",
+			action:                    func(w ResponseWriter) error { return nil },
+			expectWrittenBeforeHijack: false,
+			expectHijackSuccess:       true,
+			expectWrittenAfterHijack:  true, // Hijack itself marks the writer as written
+			expectError:               nil,
+		},
+		{
+			name: "hijack after write should fail",
+			action: func(w ResponseWriter) error {
+				_, err := w.Write([]byte("test"))
+				return err
+			},
+			expectWrittenBeforeHijack: true,
+			expectHijackSuccess:       false,
+			expectWrittenAfterHijack:  true,
+			expectError:               errHijackAlreadyWritten,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			hijacker := &mockHijacker{ResponseRecorder: httptest.NewRecorder()}
+			writer := &responseWriter{}
+			writer.reset(hijacker)
+			w := ResponseWriter(writer)
+
+			// Check initial state
+			assert.False(t, w.Written(), "should not be written initially")
+
+			// Perform pre-hijack action
+			require.NoError(t, tc.action(w), "unexpected error during pre-hijack action")
+
+			// Check state before hijacking
+			assert.Equal(t, tc.expectWrittenBeforeHijack, w.Written(), "unexpected w.Written() state before hijack")
+
+			// Attempt to hijack
+			_, _, hijackErr := w.Hijack()
+
+			// Check results
+			require.ErrorIs(t, hijackErr, tc.expectError, "unexpected error from Hijack()")
+			assert.Equal(t, tc.expectHijackSuccess, hijacker.hijacked, "unexpected hijacker.hijacked state")
+			assert.Equal(t, tc.expectWrittenAfterHijack, w.Written(), "unexpected w.Written() state after hijack")
+		})
+	}
+}
+
 func TestResponseWriterFlush(t *testing.T) {
 	testServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		writer := &responseWriter{}
--- a/routergroup_test.go
+++ b/routergroup_test.go
@ -11,6 +11,8 @@ import (
 	"github.com/stretchr/testify/assert"
 )

+var MaxHandlers = 32
+
 func init() {
 	SetMode(TestMode)
 }
@ -193,3 +195,25 @@ func testRoutesInterface(t *testing.T, r IRoutes) {
 	assert.Equal(t, r, r.Static("/static", "."))
 	assert.Equal(t, r, r.StaticFS("/static2", Dir(".", false)))
 }
+
+func TestRouterGroupCombineHandlersTooManyHandlers(t *testing.T) {
+	group := &RouterGroup{
+		Handlers: make(HandlersChain, MaxHandlers), // Assume group already has MaxHandlers middleware
+	}
+	tooManyHandlers := make(HandlersChain, MaxHandlers) // Add MaxHandlers more, total 2 * MaxHandlers
+
+	// This should trigger panic
+	assert.Panics(t, func() {
+		group.combineHandlers(tooManyHandlers)
+	}, "should panic due to too many handlers")
+}
+
+func TestRouterGroupCombineHandlersEmptySliceNotNil(t *testing.T) {
+	group := &RouterGroup{
+		Handlers: HandlersChain{},
+	}
+
+	result := group.combineHandlers(HandlersChain{})
+	assert.NotNil(t, result, "result should not be nil even with empty handlers")
+	assert.Empty(t, result, "empty handlers should return empty chain")
+}
--- a/test_helpers.go
+++ b/test_helpers.go
@ -6,7 +6,10 @@ package gin

 import "net/http"

-// CreateTestContext returns a fresh engine and context for testing purposes
+// CreateTestContext returns a fresh Engine and a Context associated with it.
+// This is useful for tests that need to set up a new Gin engine instance
+// along with a context, for example, to test middleware that doesn't depend on
+// specific routes. The ResponseWriter `w` is used to initialize the context's writer.
 func CreateTestContext(w http.ResponseWriter) (c *Context, r *Engine) {
 	r = New()
 	c = r.allocateContext(0)
@ -15,7 +18,11 @@ func CreateTestContext(w http.ResponseWriter) (c *Context, r *Engine) {
 	return
 }

-// CreateTestContextOnly returns a fresh context base on the engine for testing purposes
+// CreateTestContextOnly returns a fresh Context associated with the provided Engine `r`.
+// This is useful for tests that operate on an existing, possibly pre-configured,
+// Gin engine instance and need a new context for it.
+// The ResponseWriter `w` is used to initialize the context's writer.
+// The context is allocated with the `maxParams` setting from the provided engine.
 func CreateTestContextOnly(w http.ResponseWriter, r *Engine) (c *Context) {
 	c = r.allocateContext(r.maxParams)
 	c.reset()
--- a/testdata/test_file.txt
+++ b/testdata/test_file.txt
@ -0,0 +1,2 @@
+This is a test file for Context.File() method testing.
+It contains some sample content to verify file serving functionality.
--- a/tree.go
+++ b/tree.go
@ -383,7 +383,7 @@ func (n *node) insertChild(path string, fullPath string, handlers HandlersChain)
 		}

 		n.addChild(child)
-		n.indices = string('/')
+		n.indices = "/"
 		n = child
 		n.priority++