Merge branch 'master' into master

2021-04-28 21:58:50 +08:00 · 2021-04-28 21:58:50 +08:00 · fb741f0d63
parent e6a70fcc51 215c9ce231
commit fb741f0d63
42 changed files with 1124 additions and 349 deletions
--- a/.travis.yml
+++ b/.travis.yml
@ -3,10 +3,6 @@ language: go
 matrix:
  fast_finish: true
  include:
-  - go: 1.11.x
-    env: GO111MODULE=on
-  - go: 1.12.x
-    env: GO111MODULE=on
  - go: 1.13.x
  - go: 1.13.x
    env:
@ -19,6 +15,10 @@ matrix:
  - go: 1.15.x
    env:
      - TESTTAGS=nomsgpack
+  - go: 1.16.x
+  - go: 1.16.x
+    env:
+      - TESTTAGS=nomsgpack
  - go: master

 git:
--- a/AUTHORS.md
+++ b/AUTHORS.md
@ -190,6 +190,8 @@ People and companies, who have contributed, in alphabetical order.
 **@rogierlommers (Rogier Lommers)**
 - Add updated static serve example

+**@rw-access (Ross Wolf)**
+- Added support to mix exact and param routes

 **@se77en (Damon Zhao)**
 - Improve color logging
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -1,5 +1,44 @@
 # Gin ChangeLog

+## Gin v1.7.1
+
+### BUGFIXES
+
+* fix: data race with trustedCIDRs from [#2674](https://github.com/gin-gonic/gin/issues/2674)([#2675](https://github.com/gin-gonic/gin/pull/2675))
+
+## Gin v1.7.0
+
+### BUGFIXES
+
+* fix compile error from [#2572](https://github.com/gin-gonic/gin/pull/2572) ([#2600](https://github.com/gin-gonic/gin/pull/2600))
+* fix: print headers without Authorization header on broken pipe ([#2528](https://github.com/gin-gonic/gin/pull/2528))
+* fix(tree): reassign fullpath when register new node ([#2366](https://github.com/gin-gonic/gin/pull/2366))
+
+### ENHANCEMENTS
+
+* Support params and exact routes without creating conflicts ([#2663](https://github.com/gin-gonic/gin/pull/2663))
+* chore: improve render string performance ([#2365](https://github.com/gin-gonic/gin/pull/2365))
+* Sync route tree to httprouter latest code ([#2368](https://github.com/gin-gonic/gin/pull/2368))
+* chore: rename getQueryCache/getFormCache to initQueryCache/initFormCa ([#2375](https://github.com/gin-gonic/gin/pull/2375))
+* chore(performance): improve countParams ([#2378](https://github.com/gin-gonic/gin/pull/2378))
+* Remove some functions that have the same effect as the bytes package ([#2387](https://github.com/gin-gonic/gin/pull/2387))
+* update:SetMode function ([#2321](https://github.com/gin-gonic/gin/pull/2321))
+* remove a unused type SecureJSONPrefix ([#2391](https://github.com/gin-gonic/gin/pull/2391))
+* Add a redirect sample for POST method ([#2389](https://github.com/gin-gonic/gin/pull/2389))
+* Add CustomRecovery builtin middleware ([#2322](https://github.com/gin-gonic/gin/pull/2322))
+* binding: avoid 2038 problem on 32-bit architectures ([#2450](https://github.com/gin-gonic/gin/pull/2450))
+* Prevent panic in Context.GetQuery() when there is no Request ([#2412](https://github.com/gin-gonic/gin/pull/2412))
+* Add GetUint and GetUint64 method on gin.context ([#2487](https://github.com/gin-gonic/gin/pull/2487))
+* update content-disposition header to MIME-style ([#2512](https://github.com/gin-gonic/gin/pull/2512))
+* reduce allocs and improve the render `WriteString` ([#2508](https://github.com/gin-gonic/gin/pull/2508))
+* implement ".Unwrap() error" on Error type ([#2525](https://github.com/gin-gonic/gin/pull/2525)) ([#2526](https://github.com/gin-gonic/gin/pull/2526))
+* Allow bind with a map[string]string ([#2484](https://github.com/gin-gonic/gin/pull/2484))
+* chore: update tree ([#2371](https://github.com/gin-gonic/gin/pull/2371))
+* Support binding for slice/array obj [Rewrite] ([#2302](https://github.com/gin-gonic/gin/pull/2302))
+* basic auth: fix timing oracle ([#2609](https://github.com/gin-gonic/gin/pull/2609))
+* Add mixed param and non-param paths (port of httprouter[#329](https://github.com/gin-gonic/gin/pull/329)) ([#2663](https://github.com/gin-gonic/gin/pull/2663))
+* feat(engine): add trustedproxies and remoteIP ([#2632](https://github.com/gin-gonic/gin/pull/2632))
+
 ## Gin v1.6.3

 ### ENHANCEMENTS
--- a/README.md
+++ b/README.md
@ -23,7 +23,7 @@ Gin is a web framework written in Go (Golang). It features a martini-like API wi
  - [Quick start](#quick-start)
  - [Benchmarks](#benchmarks)
  - [Gin v1. stable](#gin-v1-stable)
-  - [Build with jsoniter](#build-with-jsoniter)
+  - [Build with jsoniter/go-json](#build-with-json-replacement)
  - [API Examples](#api-examples)
    - [Using GET, POST, PUT, PATCH, DELETE and OPTIONS](#using-get-post-put-patch-delete-and-options)
    - [Parameters in path](#parameters-in-path)
@ -84,7 +84,7 @@ Gin is a web framework written in Go (Golang). It features a martini-like API wi

 To install Gin package, you need to install Go and set your Go workspace first.

-1. The first need [Go](https://golang.org/) installed (**version 1.11+ is required**), then you can use the below Go command to install Gin.
+1. The first need [Go](https://golang.org/) installed (**version 1.13+ is required**), then you can use the below Go command to install Gin.

 ```sh
 $ go get -u github.com/gin-gonic/gin
@ -182,13 +182,18 @@ Gin uses a custom version of [HttpRouter](https://github.com/julienschmidt/httpr
 - [x] Battle tested.
 - [x] API frozen, new releases will not break your code.

-## Build with [jsoniter](https://github.com/json-iterator/go)
+## Build with json replacement

-Gin uses `encoding/json` as default json package but you can change to [jsoniter](https://github.com/json-iterator/go) by build from other tags.
+Gin uses `encoding/json` as default json package but you can change it by build from other tags.

+[jsoniter](https://github.com/json-iterator/go)
 ```sh
 $ go build -tags=jsoniter .
 ```
+[go-json](https://github.com/goccy/go-json)
+```sh
+$ go build -tags=go_json .
+```

 ## API Examples

@ -243,6 +248,13 @@ func main() {
 		c.FullPath() == "/user/:name/*action" // true
 	})

+	// This handler will add a new router for /user/groups.
+	// Exact routes are resolved before param routes, regardless of the order they were defined.
+	// Routes starting with /user/groups are never interpreted as /user/:name/... routes
+	router.GET("/user/groups", func(c *gin.Context) {
+		c.String(http.StatusOK, "The available groups are [...]", name)
+	})
+
 	router.Run(":8080")
 }
 ```
@ -1797,8 +1809,8 @@ func main() {
 	// Initializing the server in a goroutine so that
 	// it won't block the graceful shutdown handling below
 	go func() {
-		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
-			log.Fatalf("listen: %s\n", err)
+		if err := srv.ListenAndServe(); err != nil && errors.Is(err, http.ErrServerClosed) {
+			log.Printf("listen: %s\n", err)
 		}
 	}()

@ -1816,6 +1828,7 @@ func main() {
 	// the request it is currently handling
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
+
 	if err := srv.Shutdown(ctx); err != nil {
 		log.Fatal("Server forced to shutdown:", err)
 	}
@ -2120,6 +2133,39 @@ func main() {
 }
 ```

+## Don't trust all proxies
+
+Gin lets you specify which headers to hold the real client IP (if any),
+as well as specifying which proxies (or direct clients) you trust to
+specify one of these headers.
+
+The `TrustedProxies` slice on your `gin.Engine` specifes network addresses or
+network CIDRs from where clients which their request headers related to client
+IP can be trusted. They can be IPv4 addresses, IPv4 CIDRs, IPv6 addresses or
+IPv6 CIDRs.
+
+```go
+import (
+	"fmt"
+
+	"github.com/gin-gonic/gin"
+)
+
+func main() {
+
+	router := gin.Default()
+	router.TrustedProxies = []string{"192.168.1.2"}
+
+	router.GET("/", func(c *gin.Context) {
+		// If the client is 192.168.1.2, use the X-Forwarded-For
+		// header to deduce the original client IP from the trust-
+		// worthy parts of that header.
+		// Otherwise, simply return the direct client IP
+		fmt.Printf("ClientIP: %s\n", c.ClientIP())
+	})
+	router.Run()
+}
+```

 ## Testing

@ -2178,3 +2224,4 @@ Awesome project lists using [Gin](https://github.com/gin-gonic/gin) web framewor
 * [picfit](https://github.com/thoas/picfit): An image resizing server written in Go.
 * [brigade](https://github.com/brigadecore/brigade): Event-based Scripting for Kubernetes.
 * [dkron](https://github.com/distribworks/dkron): Distributed, fault tolerant job scheduling system.
+
--- a/auth.go
+++ b/auth.go
@ -5,6 +5,7 @@
 package gin

 import (
+	"crypto/subtle"
 	"encoding/base64"
 	"net/http"
 	"strconv"
@ -30,7 +31,7 @@ func (a authPairs) searchCredential(authValue string) (string, bool) {
 		return "", false
 	}
 	for _, pair := range a {
-		if pair.value == authValue {
+		if subtle.ConstantTimeCompare([]byte(pair.value), []byte(authValue)) == 1 {
 			return pair.user, true
 		}
 	}
--- a/binding/binding.go
+++ b/binding/binding.go
@ -2,6 +2,7 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.

+//go:build !nomsgpack
 // +build !nomsgpack

 package binding
@ -51,7 +52,8 @@ type BindingUri interface {
 // https://github.com/go-playground/validator/tree/v8.18.2.
 type StructValidator interface {
 	// ValidateStruct can receive any kind of type and it should never panic, even if the configuration is not right.
-	// If the received type is not a struct, any validation should be skipped and nil must be returned.
+	// If the received type is a slice|array, the validation should be performed travel on every element.
+	// If the received type is not a struct or slice|array, any validation should be skipped and nil must be returned.
 	// If the received type is a struct or pointer to a struct, the validation should be performed.
 	// If the struct is not valid or the validation itself fails, a descriptive error should be returned.
 	// Otherwise nil must be returned.
--- a/binding/binding_msgpack_test.go
+++ b/binding/binding_msgpack_test.go
@ -2,6 +2,7 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.

+//go:build !nomsgpack
 // +build !nomsgpack

 package binding
--- a/binding/binding_nomsgpack.go
+++ b/binding/binding_nomsgpack.go
@ -2,6 +2,7 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.

+//go:build nomsgpack
 // +build nomsgpack

 package binding
--- a/binding/binding_test.go
+++ b/binding/binding_test.go
@ -13,6 +13,7 @@ import (
 	"mime/multipart"
 	"net/http"
 	"os"
+	"reflect"
 	"strconv"
 	"strings"
 	"testing"
@ -34,7 +35,7 @@ type QueryTest struct {
 }

 type FooStruct struct {
-	Foo string `msgpack:"foo" json:"foo" form:"foo" xml:"foo" binding:"required"`
+	Foo string `msgpack:"foo" json:"foo" form:"foo" xml:"foo" binding:"required,max=32"`
 }

 type FooBarStruct struct {
@ -180,6 +181,20 @@ func TestBindingJSON(t *testing.T) {
 		`{"foo": "bar"}`, `{"bar": "foo"}`)
 }

+func TestBindingJSONSlice(t *testing.T) {
+	EnableDecoderDisallowUnknownFields = true
+	defer func() {
+		EnableDecoderDisallowUnknownFields = false
+	}()
+
+	testBodyBindingSlice(t, JSON, "json", "/", "/", `[]`, ``)
+	testBodyBindingSlice(t, JSON, "json", "/", "/", `[{"foo": "123"}]`, `[{}]`)
+	testBodyBindingSlice(t, JSON, "json", "/", "/", `[{"foo": "123"}]`, `[{"foo": ""}]`)
+	testBodyBindingSlice(t, JSON, "json", "/", "/", `[{"foo": "123"}]`, `[{"foo": 123}]`)
+	testBodyBindingSlice(t, JSON, "json", "/", "/", `[{"foo": "123"}]`, `[{"bar": 123}]`)
+	testBodyBindingSlice(t, JSON, "json", "/", "/", `[{"foo": "123"}]`, `[{"foo": "123456789012345678901234567890123"}]`)
+}
+
 func TestBindingJSONUseNumber(t *testing.T) {
 	testBodyBindingUseNumber(t,
 		JSON, "json",
@ -200,6 +215,12 @@ func TestBindingJSONDisallowUnknownFields(t *testing.T) {
 		`{"foo": "bar"}`, `{"foo": "bar", "what": "this"}`)
 }

+func TestBindingJSONStringMap(t *testing.T) {
+	testBodyBindingStringMap(t, JSON,
+		"/", "/",
+		`{"foo": "bar", "hello": "world"}`, `{"num": 2}`)
+}
+
 func TestBindingForm(t *testing.T) {
 	testFormBinding(t, "POST",
 		"/", "/",
@ -336,6 +357,37 @@ func TestBindingFormForType(t *testing.T) {
 		"", "", "StructPointer")
 }

+func TestBindingFormStringMap(t *testing.T) {
+	testBodyBindingStringMap(t, Form,
+		"/", "",
+		`foo=bar&hello=world`, "")
+	// Should pick the last value
+	testBodyBindingStringMap(t, Form,
+		"/", "",
+		`foo=something&foo=bar&hello=world`, "")
+}
+
+func TestBindingFormStringSliceMap(t *testing.T) {
+	obj := make(map[string][]string)
+	req := requestWithBody("POST", "/", "foo=something&foo=bar&hello=world")
+	req.Header.Add("Content-Type", MIMEPOSTForm)
+	err := Form.Bind(req, &obj)
+	assert.NoError(t, err)
+	assert.NotNil(t, obj)
+	assert.Len(t, obj, 2)
+	target := map[string][]string{
+		"foo":   {"something", "bar"},
+		"hello": {"world"},
+	}
+	assert.True(t, reflect.DeepEqual(obj, target))
+
+	objInvalid := make(map[string][]int)
+	req = requestWithBody("POST", "/", "foo=something&foo=bar&hello=world")
+	req.Header.Add("Content-Type", MIMEPOSTForm)
+	err = Form.Bind(req, &objInvalid)
+	assert.Error(t, err)
+}
+
 func TestBindingQuery(t *testing.T) {
 	testQueryBinding(t, "POST",
 		"/?foo=bar&bar=foo", "/",
@ -366,6 +418,28 @@ func TestBindingQueryBoolFail(t *testing.T) {
 		"bool_foo=unused", "")
 }

+func TestBindingQueryStringMap(t *testing.T) {
+	b := Query
+
+	obj := make(map[string]string)
+	req := requestWithBody("GET", "/?foo=bar&hello=world", "")
+	err := b.Bind(req, &obj)
+	assert.NoError(t, err)
+	assert.NotNil(t, obj)
+	assert.Len(t, obj, 2)
+	assert.Equal(t, "bar", obj["foo"])
+	assert.Equal(t, "world", obj["hello"])
+
+	obj = make(map[string]string)
+	req = requestWithBody("GET", "/?foo=bar&foo=2&hello=world", "") // should pick last
+	err = b.Bind(req, &obj)
+	assert.NoError(t, err)
+	assert.NotNil(t, obj)
+	assert.Len(t, obj, 2)
+	assert.Equal(t, "2", obj["foo"])
+	assert.Equal(t, "world", obj["hello"])
+}
+
 func TestBindingXML(t *testing.T) {
 	testBodyBinding(t,
 		XML, "xml",
@ -387,6 +461,13 @@ func TestBindingYAML(t *testing.T) {
 		`foo: bar`, `bar: foo`)
 }

+func TestBindingYAMLStringMap(t *testing.T) {
+	// YAML is a superset of JSON, so the test below is JSON (to avoid newlines)
+	testBodyBindingStringMap(t, YAML,
+		"/", "/",
+		`{"foo": "bar", "hello": "world"}`, `{"nested": {"foo": "bar"}}`)
+}
+
 func TestBindingYAMLFail(t *testing.T) {
 	testBodyBindingFail(t,
 		YAML, "yaml",
@ -1114,6 +1195,46 @@ func testBodyBinding(t *testing.T, b Binding, name, path, badPath, body, badBody
 	assert.Error(t, err)
 }

+func testBodyBindingSlice(t *testing.T, b Binding, name, path, badPath, body, badBody string) {
+	assert.Equal(t, name, b.Name())
+
+	var obj1 []FooStruct
+	req := requestWithBody("POST", path, body)
+	err := b.Bind(req, &obj1)
+	assert.NoError(t, err)
+
+	var obj2 []FooStruct
+	req = requestWithBody("POST", badPath, badBody)
+	err = JSON.Bind(req, &obj2)
+	assert.Error(t, err)
+}
+
+func testBodyBindingStringMap(t *testing.T, b Binding, path, badPath, body, badBody string) {
+	obj := make(map[string]string)
+	req := requestWithBody("POST", path, body)
+	if b.Name() == "form" {
+		req.Header.Add("Content-Type", MIMEPOSTForm)
+	}
+	err := b.Bind(req, &obj)
+	assert.NoError(t, err)
+	assert.NotNil(t, obj)
+	assert.Len(t, obj, 2)
+	assert.Equal(t, "bar", obj["foo"])
+	assert.Equal(t, "world", obj["hello"])
+
+	if badPath != "" && badBody != "" {
+		obj = make(map[string]string)
+		req = requestWithBody("POST", badPath, badBody)
+		err = b.Bind(req, &obj)
+		assert.Error(t, err)
+	}
+
+	objInt := make(map[string]int)
+	req = requestWithBody("POST", path, body)
+	err = b.Bind(req, &objInt)
+	assert.Error(t, err)
+}
+
 func testBodyBindingUseNumber(t *testing.T, b Binding, name, path, badPath, body, badBody string) {
 	assert.Equal(t, name, b.Name())

--- a/binding/default_validator.go
+++ b/binding/default_validator.go
@ -5,7 +5,9 @@
 package binding

 import (
+	"fmt"
 	"reflect"
+	"strings"
 	"sync"

 	"github.com/go-playground/validator/v10"
@ -16,22 +18,54 @@ type defaultValidator struct {
 	validate *validator.Validate
 }

+type sliceValidateError []error
+
+func (err sliceValidateError) Error() string {
+	var errMsgs []string
+	for i, e := range err {
+		if e == nil {
+			continue
+		}
+		errMsgs = append(errMsgs, fmt.Sprintf("[%d]: %s", i, e.Error()))
+	}
+	return strings.Join(errMsgs, "\n")
+}
+
 var _ StructValidator = &defaultValidator{}

 // ValidateStruct receives any kind of type, but only performed struct or pointer to struct type.
 func (v *defaultValidator) ValidateStruct(obj interface{}) error {
+	if obj == nil {
+		return nil
+	}
+
 	value := reflect.ValueOf(obj)
-	valueType := value.Kind()
-	if valueType == reflect.Ptr {
-		valueType = value.Elem().Kind()
-	}
-	if valueType == reflect.Struct {
-		v.lazyinit()
-		if err := v.validate.Struct(obj); err != nil {
-			return err
+	switch value.Kind() {
+	case reflect.Ptr:
+		return v.ValidateStruct(value.Elem().Interface())
+	case reflect.Struct:
+		return v.validateStruct(obj)
+	case reflect.Slice, reflect.Array:
+		count := value.Len()
+		validateRet := make(sliceValidateError, 0)
+		for i := 0; i < count; i++ {
+			if err := v.ValidateStruct(value.Index(i).Interface()); err != nil {
+				validateRet = append(validateRet, err)
+			}
 		}
+		if len(validateRet) == 0 {
+			return nil
+		}
+		return validateRet
+	default:
+		return nil
 	}
-	return nil
+}
+
+// validateStruct receives struct type
+func (v *defaultValidator) validateStruct(obj interface{}) error {
+	v.lazyinit()
+	return v.validate.Struct(obj)
 }

 // Engine returns the underlying validator engine which powers the default
--- a/binding/default_validator_test.go
+++ b/binding/default_validator_test.go
@ -0,0 +1,68 @@
+// Copyright 2020 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 binding
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestSliceValidateError(t *testing.T) {
+	tests := []struct {
+		name string
+		err  sliceValidateError
+		want string
+	}{
+		{"has nil elements", sliceValidateError{errors.New("test error"), nil}, "[0]: test error"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := tt.err.Error(); got != tt.want {
+				t.Errorf("sliceValidateError.Error() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestDefaultValidator(t *testing.T) {
+	type exampleStruct struct {
+		A string `binding:"max=8"`
+		B int    `binding:"gt=0"`
+	}
+	tests := []struct {
+		name    string
+		v       *defaultValidator
+		obj     interface{}
+		wantErr bool
+	}{
+		{"validate nil obj", &defaultValidator{}, nil, false},
+		{"validate int obj", &defaultValidator{}, 3, false},
+		{"validate struct failed-1", &defaultValidator{}, exampleStruct{A: "123456789", B: 1}, true},
+		{"validate struct failed-2", &defaultValidator{}, exampleStruct{A: "12345678", B: 0}, true},
+		{"validate struct passed", &defaultValidator{}, exampleStruct{A: "12345678", B: 1}, false},
+		{"validate *struct failed-1", &defaultValidator{}, &exampleStruct{A: "123456789", B: 1}, true},
+		{"validate *struct failed-2", &defaultValidator{}, &exampleStruct{A: "12345678", B: 0}, true},
+		{"validate *struct passed", &defaultValidator{}, &exampleStruct{A: "12345678", B: 1}, false},
+		{"validate []struct failed-1", &defaultValidator{}, []exampleStruct{{A: "123456789", B: 1}}, true},
+		{"validate []struct failed-2", &defaultValidator{}, []exampleStruct{{A: "12345678", B: 0}}, true},
+		{"validate []struct passed", &defaultValidator{}, []exampleStruct{{A: "12345678", B: 1}}, false},
+		{"validate []*struct failed-1", &defaultValidator{}, []*exampleStruct{{A: "123456789", B: 1}}, true},
+		{"validate []*struct failed-2", &defaultValidator{}, []*exampleStruct{{A: "12345678", B: 0}}, true},
+		{"validate []*struct passed", &defaultValidator{}, []*exampleStruct{{A: "12345678", B: 1}}, false},
+		{"validate *[]struct failed-1", &defaultValidator{}, &[]exampleStruct{{A: "123456789", B: 1}}, true},
+		{"validate *[]struct failed-2", &defaultValidator{}, &[]exampleStruct{{A: "12345678", B: 0}}, true},
+		{"validate *[]struct passed", &defaultValidator{}, &[]exampleStruct{{A: "12345678", B: 1}}, false},
+		{"validate *[]*struct failed-1", &defaultValidator{}, &[]*exampleStruct{{A: "123456789", B: 1}}, true},
+		{"validate *[]*struct failed-2", &defaultValidator{}, &[]*exampleStruct{{A: "12345678", B: 0}}, true},
+		{"validate *[]*struct passed", &defaultValidator{}, &[]*exampleStruct{{A: "12345678", B: 1}}, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := tt.v.ValidateStruct(tt.obj); (err != nil) != tt.wantErr {
+				t.Errorf("defaultValidator.Validate() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}
--- a/binding/form_mapping.go
+++ b/binding/form_mapping.go
@ -29,6 +29,21 @@ func mapForm(ptr interface{}, form map[string][]string) error {
 var emptyField = reflect.StructField{}

 func mapFormByTag(ptr interface{}, form map[string][]string, tag string) error {
+	// Check if ptr is a map
+	ptrVal := reflect.ValueOf(ptr)
+	var pointed interface{}
+	if ptrVal.Kind() == reflect.Ptr {
+		ptrVal = ptrVal.Elem()
+		pointed = ptrVal.Interface()
+	}
+	if ptrVal.Kind() == reflect.Map &&
+		ptrVal.Type().Key().Kind() == reflect.String {
+		if pointed != nil {
+			ptr = pointed
+		}
+		return setFormMap(ptr, form)
+	}
+
 	return mappingByPtr(ptr, formSource(form), tag)
 }

@ -349,3 +364,29 @@ func head(str, sep string) (head string, tail string) {
 	}
 	return str[:idx], str[idx+len(sep):]
 }
+
+func setFormMap(ptr interface{}, form map[string][]string) error {
+	el := reflect.TypeOf(ptr).Elem()
+
+	if el.Kind() == reflect.Slice {
+		ptrMap, ok := ptr.(map[string][]string)
+		if !ok {
+			return errors.New("cannot convert to map slices of strings")
+		}
+		for k, v := range form {
+			ptrMap[k] = v
+		}
+
+		return nil
+	}
+
+	ptrMap, ok := ptr.(map[string]string)
+	if !ok {
+		return errors.New("cannot convert to map of strings")
+	}
+	for k, v := range form {
+		ptrMap[k] = v[len(v)-1] // pick last
+	}
+
+	return nil
+}
--- a/binding/json.go
+++ b/binding/json.go
@ -6,7 +6,7 @@ package binding

 import (
 	"bytes"
-	"fmt"
+	"errors"
 	"io"
 	"net/http"

@ -32,7 +32,7 @@ func (jsonBinding) Name() string {

 func (jsonBinding) Bind(req *http.Request, obj interface{}) error {
 	if req == nil || req.Body == nil {
-		return fmt.Errorf("invalid request")
+		return errors.New("invalid request")
 	}
 	return decodeJSON(req.Body, obj)
 }
--- a/binding/json_test.go
+++ b/binding/json_test.go
@ -19,3 +19,12 @@ func TestJSONBindingBindBody(t *testing.T) {
 	require.NoError(t, err)
 	assert.Equal(t, "FOO", s.Foo)
 }
+
+func TestJSONBindingBindBodyMap(t *testing.T) {
+	s := make(map[string]string)
+	err := jsonBinding{}.BindBody([]byte(`{"foo": "FOO","hello":"world"}`), &s)
+	require.NoError(t, err)
+	assert.Len(t, s, 2)
+	assert.Equal(t, "FOO", s["foo"])
+	assert.Equal(t, "world", s["hello"])
+}
--- a/binding/msgpack.go
+++ b/binding/msgpack.go
@ -2,6 +2,7 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.

+//go:build !nomsgpack
 // +build !nomsgpack

 package binding
--- a/binding/msgpack_test.go
+++ b/binding/msgpack_test.go
@ -2,6 +2,7 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.

+//go:build !nomsgpack
 // +build !nomsgpack

 package binding
--- a/context.go
+++ b/context.go
@ -725,32 +725,80 @@ func (c *Context) ShouldBindBodyWith(obj interface{}, bb binding.BindingBody) (e
 	return bb.BindBody(body, obj)
 }

-// ClientIP implements a best effort algorithm to return the real client IP, it parses
-// X-Real-IP and X-Forwarded-For in order to work properly with reverse-proxies such us: nginx or haproxy.
-// Use X-Forwarded-For before X-Real-Ip as nginx uses X-Real-Ip with the proxy's IP.
+// ClientIP implements a best effort algorithm to return the real client IP.
+// It called c.RemoteIP() under the hood, to check if the remote IP is a trusted proxy or not.
+// If it's it will then try to parse the headers defined in Engine.RemoteIPHeaders (defaulting to [X-Forwarded-For, X-Real-Ip]).
+// If the headers are nots syntactically valid OR the remote IP does not correspong to a trusted proxy,
+// the remote IP (coming form Request.RemoteAddr) is returned.
 func (c *Context) ClientIP() string {
-	if c.engine.ForwardedByClientIP {
-		clientIP := c.requestHeader("X-Forwarded-For")
-		clientIP = strings.TrimSpace(strings.Split(clientIP, ",")[0])
-		if clientIP == "" {
-			clientIP = strings.TrimSpace(c.requestHeader("X-Real-Ip"))
-		}
-		if clientIP != "" {
-			return clientIP
-		}
-	}
-
 	if c.engine.AppEngine {
 		if addr := c.requestHeader("X-Appengine-Remote-Addr"); addr != "" {
 			return addr
 		}
 	}

-	if ip, _, err := net.SplitHostPort(strings.TrimSpace(c.Request.RemoteAddr)); err == nil {
-		return ip
+	remoteIP, trusted := c.RemoteIP()
+	if remoteIP == nil {
+		return ""
 	}

-	return ""
+	if trusted && c.engine.ForwardedByClientIP && c.engine.RemoteIPHeaders != nil {
+		for _, headerName := range c.engine.RemoteIPHeaders {
+			ip, valid := validateHeader(c.requestHeader(headerName))
+			if valid {
+				return ip
+			}
+		}
+	}
+	return remoteIP.String()
+}
+
+// RemoteIP parses the IP from Request.RemoteAddr, normalizes and returns the IP (without the port).
+// It also checks if the remoteIP is a trusted proxy or not.
+// In order to perform this validation, it will see if the IP is contained within at least one of the CIDR blocks
+// defined in Engine.TrustedProxies
+func (c *Context) RemoteIP() (net.IP, bool) {
+	ip, _, err := net.SplitHostPort(strings.TrimSpace(c.Request.RemoteAddr))
+	if err != nil {
+		return nil, false
+	}
+	remoteIP := net.ParseIP(ip)
+	if remoteIP == nil {
+		return nil, false
+	}
+
+	if c.engine.trustedCIDRs != nil {
+		for _, cidr := range c.engine.trustedCIDRs {
+			if cidr.Contains(remoteIP) {
+				return remoteIP, true
+			}
+		}
+	}
+
+	return remoteIP, false
+}
+
+func validateHeader(header string) (clientIP string, valid bool) {
+	if header == "" {
+		return "", false
+	}
+	items := strings.Split(header, ",")
+	for i, ipStr := range items {
+		ipStr = strings.TrimSpace(ipStr)
+		ip := net.ParseIP(ipStr)
+		if ip == nil {
+			return "", false
+		}
+
+		// We need to return the first IP in the list, but,
+		// we should not early return since we need to validate that
+		// the rest of the header is syntactically valid
+		if i == 0 {
+			clientIP = ipStr
+			valid = true
+		}
+	}
+	return
 }

 // ContentType returns the Content-Type header of the request.
@ -891,7 +939,7 @@ func (c *Context) SecureJSON(code int, obj interface{}) {
 }

 // JSONP serializes the given struct as JSON into the response body.
-// It add padding to response body to request data from a server residing in a different domain than the client.
+// It adds padding to response body to request data from a server residing in a different domain than the client.
 // It also sets the Content-Type as "application/javascript".
 func (c *Context) JSONP(code int, obj interface{}) {
 	callback := c.DefaultQuery("callback", "")
@ -968,7 +1016,7 @@ func (c *Context) DataFromReader(code int, contentLength int64, contentType stri
 	})
 }

-// File writes the specified file into the body stream in a efficient way.
+// File writes the specified file into the body stream in an efficient way.
 func (c *Context) File(filepath string) {
 	http.ServeFile(c.Writer, c.Request, filepath)
 }
--- a/context_appengine.go
+++ b/context_appengine.go
@ -1,9 +1,10 @@
-// +build appengine
-
 // Copyright 2017 Manu Martinez-Almeida.  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 appengine
+// +build appengine
+
 package gin

 func init() {
--- a/context_test.go
+++ b/context_test.go
@ -1018,7 +1018,9 @@ func TestContextRenderFile(t *testing.T) {

 	assert.Equal(t, http.StatusOK, w.Code)
 	assert.Contains(t, w.Body.String(), "func New() *Engine {")
-	assert.Equal(t, "text/plain; charset=utf-8", w.Header().Get("Content-Type"))
+	// Content-Type='text/plain; charset=utf-8' when go version <= 1.16,
+	// else, Content-Type='text/x-go; charset=utf-8'
+	assert.NotEqual(t, "", w.Header().Get("Content-Type"))
 }

 func TestContextRenderFileFromFS(t *testing.T) {
@ -1030,7 +1032,9 @@ func TestContextRenderFileFromFS(t *testing.T) {

 	assert.Equal(t, http.StatusOK, w.Code)
 	assert.Contains(t, w.Body.String(), "func New() *Engine {")
-	assert.Equal(t, "text/plain; charset=utf-8", w.Header().Get("Content-Type"))
+	// Content-Type='text/plain; charset=utf-8' when go version <= 1.16,
+	// else, Content-Type='text/x-go; charset=utf-8'
+	assert.NotEqual(t, "", w.Header().Get("Content-Type"))
 	assert.Equal(t, "/some/path", c.Request.URL.Path)
 }

@ -1044,7 +1048,7 @@ func TestContextRenderAttachment(t *testing.T) {

 	assert.Equal(t, 200, w.Code)
 	assert.Contains(t, w.Body.String(), "func New() *Engine {")
-	assert.Equal(t, fmt.Sprintf("attachment; filename=\"%s\"", newFilename), w.HeaderMap.Get("Content-Disposition"))
+	assert.Equal(t, fmt.Sprintf("attachment; filename=\"%s\"", newFilename), w.Header().Get("Content-Disposition"))
 }

 // TestContextRenderYAML tests that the response is serialized as YAML
@ -1388,15 +1392,18 @@ func TestContextAbortWithError(t *testing.T) {
 	assert.True(t, c.IsAborted())
 }

+func resetTrustedCIDRs(c *Context) {
+	c.engine.trustedCIDRs, _ = c.engine.prepareTrustedCIDRs()
+}
+
 func TestContextClientIP(t *testing.T) {
 	c, _ := CreateTestContext(httptest.NewRecorder())
 	c.Request, _ = http.NewRequest("POST", "/", nil)
+	resetTrustedCIDRs(c)
+	resetContextForClientIPTests(c)

-	c.Request.Header.Set("X-Real-IP", " 10.10.10.10  ")
-	c.Request.Header.Set("X-Forwarded-For", "  20.20.20.20, 30.30.30.30")
-	c.Request.Header.Set("X-Appengine-Remote-Addr", "50.50.50.50")
-	c.Request.RemoteAddr = "  40.40.40.40:42123 "
-
+	// Legacy tests (validating that the defaults don't break the
+	// (insecure!) old behaviour)
 	assert.Equal(t, "20.20.20.20", c.ClientIP())

 	c.Request.Header.Del("X-Forwarded-For")
@ -1416,6 +1423,84 @@ func TestContextClientIP(t *testing.T) {
 	// no port
 	c.Request.RemoteAddr = "50.50.50.50"
 	assert.Empty(t, c.ClientIP())
+
+	// Tests exercising the TrustedProxies functionality
+	resetContextForClientIPTests(c)
+
+	// No trusted proxies
+	c.engine.TrustedProxies = []string{}
+	resetTrustedCIDRs(c)
+	c.engine.RemoteIPHeaders = []string{"X-Forwarded-For"}
+	assert.Equal(t, "40.40.40.40", c.ClientIP())
+
+	// Last proxy is trusted, but the RemoteAddr is not
+	c.engine.TrustedProxies = []string{"30.30.30.30"}
+	resetTrustedCIDRs(c)
+	assert.Equal(t, "40.40.40.40", c.ClientIP())
+
+	// Only trust RemoteAddr
+	c.engine.TrustedProxies = []string{"40.40.40.40"}
+	resetTrustedCIDRs(c)
+	assert.Equal(t, "20.20.20.20", c.ClientIP())
+
+	// All steps are trusted
+	c.engine.TrustedProxies = []string{"40.40.40.40", "30.30.30.30", "20.20.20.20"}
+	resetTrustedCIDRs(c)
+	assert.Equal(t, "20.20.20.20", c.ClientIP())
+
+	// Use CIDR
+	c.engine.TrustedProxies = []string{"40.40.25.25/16", "30.30.30.30"}
+	resetTrustedCIDRs(c)
+	assert.Equal(t, "20.20.20.20", c.ClientIP())
+
+	// Use hostname that resolves to all the proxies
+	c.engine.TrustedProxies = []string{"foo"}
+	resetTrustedCIDRs(c)
+	assert.Equal(t, "40.40.40.40", c.ClientIP())
+
+	// Use hostname that returns an error
+	c.engine.TrustedProxies = []string{"bar"}
+	resetTrustedCIDRs(c)
+	assert.Equal(t, "40.40.40.40", c.ClientIP())
+
+	// X-Forwarded-For has a non-IP element
+	c.engine.TrustedProxies = []string{"40.40.40.40"}
+	resetTrustedCIDRs(c)
+	c.Request.Header.Set("X-Forwarded-For", " blah ")
+	assert.Equal(t, "40.40.40.40", c.ClientIP())
+
+	// Result from LookupHost has non-IP element. This should never
+	// happen, but we should test it to make sure we handle it
+	// gracefully.
+	c.engine.TrustedProxies = []string{"baz"}
+	resetTrustedCIDRs(c)
+	c.Request.Header.Set("X-Forwarded-For", " 30.30.30.30 ")
+	assert.Equal(t, "40.40.40.40", c.ClientIP())
+
+	c.engine.TrustedProxies = []string{"40.40.40.40"}
+	resetTrustedCIDRs(c)
+	c.Request.Header.Del("X-Forwarded-For")
+	c.engine.RemoteIPHeaders = []string{"X-Forwarded-For", "X-Real-IP"}
+	assert.Equal(t, "10.10.10.10", c.ClientIP())
+
+	c.engine.RemoteIPHeaders = []string{}
+	c.engine.AppEngine = true
+	assert.Equal(t, "50.50.50.50", c.ClientIP())
+
+	c.Request.Header.Del("X-Appengine-Remote-Addr")
+	assert.Equal(t, "40.40.40.40", c.ClientIP())
+
+	// no port
+	c.Request.RemoteAddr = "50.50.50.50"
+	assert.Empty(t, c.ClientIP())
+}
+
+func resetContextForClientIPTests(c *Context) {
+	c.Request.Header.Set("X-Real-IP", " 10.10.10.10  ")
+	c.Request.Header.Set("X-Forwarded-For", "  20.20.20.20, 30.30.30.30")
+	c.Request.Header.Set("X-Appengine-Remote-Addr", "50.50.50.50")
+	c.Request.RemoteAddr = "  40.40.40.40:42123 "
+	c.engine.AppEngine = false
 }

 func TestContextContentType(t *testing.T) {
@ -1960,3 +2045,12 @@ func TestContextWithKeysMutex(t *testing.T) {
 	assert.Nil(t, value)
 	assert.False(t, err)
 }
+
+func TestRemoteIPFail(t *testing.T) {
+	c, _ := CreateTestContext(httptest.NewRecorder())
+	c.Request, _ = http.NewRequest("POST", "/", nil)
+	c.Request.RemoteAddr = "[:::]:80"
+	ip, trust := c.RemoteIP()
+	assert.Nil(t, ip)
+	assert.False(t, trust)
+}
--- a/debug.go
+++ b/debug.go
@ -12,7 +12,7 @@ import (
 	"strings"
 )

-const ginSupportMinGoVer = 10
+const ginSupportMinGoVer = 13

 // IsDebugging returns true if the framework is running in debug mode.
 // Use SetMode(gin.ReleaseMode) to disable debug mode.
@ -67,7 +67,7 @@ func getMinVer(v string) (uint64, error) {

 func debugPrintWARNINGDefault() {
 	if v, e := getMinVer(runtime.Version()); e == nil && v <= ginSupportMinGoVer {
-		debugPrint(`[WARNING] Now Gin requires Go 1.11 or later and Go 1.12 will be required soon.
+		debugPrint(`[WARNING] Now Gin requires Go 1.13+.

 `)
 	}
--- a/debug_test.go
+++ b/debug_test.go
@ -104,7 +104,7 @@ func TestDebugPrintWARNINGDefault(t *testing.T) {
 	})
 	m, e := getMinVer(runtime.Version())
 	if e == nil && m <= ginSupportMinGoVer {
-		assert.Equal(t, "[GIN-debug] [WARNING] Now Gin requires Go 1.11 or later and Go 1.12 will be required soon.\n\n[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
+		assert.Equal(t, "[GIN-debug] [WARNING] Now Gin requires Go 1.13+.\n\n[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
 	} else {
 		assert.Equal(t, "[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
 	}
--- a/errors_1.13_test.go
+++ b/errors_1.13_test.go
@ -1,33 +0,0 @@
-// +build go1.13
-
-package gin
-
-import (
-	"errors"
-	"fmt"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-type TestErr string
-
-func (e TestErr) Error() string { return string(e) }
-
-// TestErrorUnwrap tests the behavior of gin.Error with "errors.Is()" and "errors.As()".
-// "errors.Is()" and "errors.As()" have been added to the standard library in go 1.13,
-// hence the "// +build go1.13" directive at the beginning of this file.
-func TestErrorUnwrap(t *testing.T) {
-	innerErr := TestErr("somme error")
-
-	// 2 layers of wrapping : use 'fmt.Errorf("%w")' to wrap a gin.Error{}, which itself wraps innerErr
-	err := fmt.Errorf("wrapped: %w", &Error{
-		Err:  innerErr,
-		Type: ErrorTypeAny,
-	})
-
-	// check that 'errors.Is()' and 'errors.As()' behave as expected :
-	assert.True(t, errors.Is(err, innerErr))
-	var testErr TestErr
-	assert.True(t, errors.As(err, &testErr))
-}
--- a/errors_test.go
+++ b/errors_test.go
@ -6,6 +6,7 @@ package gin

 import (
 	"errors"
+	"fmt"
 	"testing"

 	"github.com/gin-gonic/gin/internal/json"
@ -104,3 +105,24 @@ Error #03: third
 	assert.Nil(t, errs.JSON())
 	assert.Empty(t, errs.String())
 }
+
+type TestErr string
+
+func (e TestErr) Error() string { return string(e) }
+
+// TestErrorUnwrap tests the behavior of gin.Error with "errors.Is()" and "errors.As()".
+// "errors.Is()" and "errors.As()" have been added to the standard library in go 1.13.
+func TestErrorUnwrap(t *testing.T) {
+	innerErr := TestErr("somme error")
+
+	// 2 layers of wrapping : use 'fmt.Errorf("%w")' to wrap a gin.Error{}, which itself wraps innerErr
+	err := fmt.Errorf("wrapped: %w", &Error{
+		Err:  innerErr,
+		Type: ErrorTypeAny,
+	})
+
+	// check that 'errors.Is()' and 'errors.As()' behave as expected :
+	assert.True(t, errors.Is(err, innerErr))
+	var testErr TestErr
+	assert.True(t, errors.As(err, &testErr))
+}
--- a/gin.go
+++ b/gin.go
@ -84,9 +84,26 @@ type Engine struct {
 	// If no other Method is allowed, the request is delegated to the NotFound
 	// handler.
 	HandleMethodNotAllowed bool
-	ForwardedByClientIP    bool

-	// #726 #755 If enabled, it will thrust some headers starting with
+	// If enabled, client IP will be parsed from the request's headers that
+	// match those stored at `(*gin.Engine).RemoteIPHeaders`. If no IP was
+	// fetched, it falls back to the IP obtained from
+	// `(*gin.Context).Request.RemoteAddr`.
+	ForwardedByClientIP bool
+
+	// List of headers used to obtain the client IP when
+	// `(*gin.Engine).ForwardedByClientIP` is `true` and
+	// `(*gin.Context).Request.RemoteAddr` is matched by at least one of the
+	// network origins of `(*gin.Engine).TrustedProxies`.
+	RemoteIPHeaders []string
+
+	// List of network origins (IPv4 addresses, IPv4 CIDRs, IPv6 addresses or
+	// IPv6 CIDRs) from which to trust request's headers that contain
+	// alternative client IP when `(*gin.Engine).ForwardedByClientIP` is
+	// `true`.
+	TrustedProxies []string
+
+	// #726 #755 If enabled, it will trust some headers starting with
 	// 'X-AppEngine...' for better integration with that PaaS.
 	AppEngine bool

@ -117,6 +134,7 @@ type Engine struct {
 	pool             sync.Pool
 	trees            methodTrees
 	maxParams        uint16
+	trustedCIDRs     []*net.IPNet
 }

 var _ IRouter = &Engine{}
@ -142,6 +160,8 @@ func New() *Engine {
 		RedirectFixedPath:      false,
 		HandleMethodNotAllowed: false,
 		ForwardedByClientIP:    true,
+		RemoteIPHeaders:        []string{"X-Forwarded-For", "X-Real-IP"},
+		TrustedProxies:         []string{"0.0.0.0/0"},
 		AppEngine:              defaultAppEngine,
 		UseRawPath:             false,
 		RemoveExtraSlash:       false,
@ -327,12 +347,60 @@ func iterate(path, method string, routes RoutesInfo, root *node) RoutesInfo {
 func (engine *Engine) Run(addr ...string) (err error) {
 	defer func() { debugPrintError(err) }()

+	trustedCIDRs, err := engine.prepareTrustedCIDRs()
+	if err != nil {
+		return err
+	}
+	engine.trustedCIDRs = trustedCIDRs
 	address := resolveAddress(addr)
 	debugPrint("Listening and serving HTTP on %s\n", address)
 	err = http.ListenAndServe(address, engine)
 	return
 }

+func (engine *Engine) prepareTrustedCIDRs() ([]*net.IPNet, error) {
+	if engine.TrustedProxies == nil {
+		return nil, nil
+	}
+
+	cidr := make([]*net.IPNet, 0, len(engine.TrustedProxies))
+	for _, trustedProxy := range engine.TrustedProxies {
+		if !strings.Contains(trustedProxy, "/") {
+			ip := parseIP(trustedProxy)
+			if ip == nil {
+				return cidr, &net.ParseError{Type: "IP address", Text: trustedProxy}
+			}
+
+			switch len(ip) {
+			case net.IPv4len:
+				trustedProxy += "/32"
+			case net.IPv6len:
+				trustedProxy += "/128"
+			}
+		}
+		_, cidrNet, err := net.ParseCIDR(trustedProxy)
+		if err != nil {
+			return cidr, err
+		}
+		cidr = append(cidr, cidrNet)
+	}
+	return cidr, nil
+}
+
+// parseIP parse a string representation of an IP and returns a net.IP with the
+// minimum byte representation or nil if input is invalid.
+func parseIP(ip string) net.IP {
+	parsedIP := net.ParseIP(ip)
+
+	if ipv4 := parsedIP.To4(); ipv4 != nil {
+		// return ip in a 4-byte representation
+		return ipv4
+	}
+
+	// return ip in a 16-byte representation or nil
+	return parsedIP
+}
+
 // RunTLS attaches the router to a http.Server and starts listening and serving HTTPS (secure) 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.
--- a/gin_integration_test.go
+++ b/gin_integration_test.go
@ -14,6 +14,7 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"os"
+	"path/filepath"
 	"sync"
 	"testing"
 	"time"
@ -54,6 +55,13 @@ func TestRunEmpty(t *testing.T) {
 	testRequest(t, "http://localhost:8080/example")
 }

+func TestTrustedCIDRsForRun(t *testing.T) {
+	os.Setenv("PORT", "")
+	router := New()
+	router.TrustedProxies = []string{"hello/world"}
+	assert.Error(t, router.Run(":8080"))
+}
+
 func TestRunTLS(t *testing.T) {
 	router := New()
 	go func() {
@ -146,7 +154,7 @@ func TestRunWithPort(t *testing.T) {
 func TestUnixSocket(t *testing.T) {
 	router := New()

-	unixTestSocket := "/tmp/unix_unit_test"
+	unixTestSocket := filepath.Join(os.TempDir(), "unix_unit_test")

 	defer os.Remove(unixTestSocket)

--- a/gin_test.go
+++ b/gin_test.go
@ -9,6 +9,7 @@ import (
 	"fmt"
 	"html/template"
 	"io/ioutil"
+	"net"
 	"net/http"
 	"net/http/httptest"
 	"reflect"
@ -654,6 +655,139 @@ func TestEngineHandleContextManyReEntries(t *testing.T) {
 	assert.Equal(t, int64(expectValue), middlewareCounter)
 }

+func TestPrepareTrustedCIRDsWith(t *testing.T) {
+	r := New()
+
+	// valid ipv4 cidr
+	{
+		expectedTrustedCIDRs := []*net.IPNet{parseCIDR("0.0.0.0/0")}
+		r.TrustedProxies = []string{"0.0.0.0/0"}
+
+		trustedCIDRs, err := r.prepareTrustedCIDRs()
+
+		assert.NoError(t, err)
+		assert.Equal(t, expectedTrustedCIDRs, trustedCIDRs)
+	}
+
+	// invalid ipv4 cidr
+	{
+		r.TrustedProxies = []string{"192.168.1.33/33"}
+
+		_, err := r.prepareTrustedCIDRs()
+
+		assert.Error(t, err)
+	}
+
+	// valid ipv4 address
+	{
+		expectedTrustedCIDRs := []*net.IPNet{parseCIDR("192.168.1.33/32")}
+		r.TrustedProxies = []string{"192.168.1.33"}
+
+		trustedCIDRs, err := r.prepareTrustedCIDRs()
+
+		assert.NoError(t, err)
+		assert.Equal(t, expectedTrustedCIDRs, trustedCIDRs)
+	}
+
+	// invalid ipv4 address
+	{
+		r.TrustedProxies = []string{"192.168.1.256"}
+
+		_, err := r.prepareTrustedCIDRs()
+
+		assert.Error(t, err)
+	}
+
+	// valid ipv6 address
+	{
+		expectedTrustedCIDRs := []*net.IPNet{parseCIDR("2002:0000:0000:1234:abcd:ffff:c0a8:0101/128")}
+		r.TrustedProxies = []string{"2002:0000:0000:1234:abcd:ffff:c0a8:0101"}
+
+		trustedCIDRs, err := r.prepareTrustedCIDRs()
+
+		assert.NoError(t, err)
+		assert.Equal(t, expectedTrustedCIDRs, trustedCIDRs)
+	}
+
+	// invalid ipv6 address
+	{
+		r.TrustedProxies = []string{"gggg:0000:0000:1234:abcd:ffff:c0a8:0101"}
+
+		_, err := r.prepareTrustedCIDRs()
+
+		assert.Error(t, err)
+	}
+
+	// valid ipv6 cidr
+	{
+		expectedTrustedCIDRs := []*net.IPNet{parseCIDR("::/0")}
+		r.TrustedProxies = []string{"::/0"}
+
+		trustedCIDRs, err := r.prepareTrustedCIDRs()
+
+		assert.NoError(t, err)
+		assert.Equal(t, expectedTrustedCIDRs, trustedCIDRs)
+	}
+
+	// invalid ipv6 cidr
+	{
+		r.TrustedProxies = []string{"gggg:0000:0000:1234:abcd:ffff:c0a8:0101/129"}
+
+		_, err := r.prepareTrustedCIDRs()
+
+		assert.Error(t, err)
+	}
+
+	// valid combination
+	{
+		expectedTrustedCIDRs := []*net.IPNet{
+			parseCIDR("::/0"),
+			parseCIDR("192.168.0.0/16"),
+			parseCIDR("172.16.0.1/32"),
+		}
+		r.TrustedProxies = []string{
+			"::/0",
+			"192.168.0.0/16",
+			"172.16.0.1",
+		}
+
+		trustedCIDRs, err := r.prepareTrustedCIDRs()
+
+		assert.NoError(t, err)
+		assert.Equal(t, expectedTrustedCIDRs, trustedCIDRs)
+	}
+
+	// invalid combination
+	{
+		r.TrustedProxies = []string{
+			"::/0",
+			"192.168.0.0/16",
+			"172.16.0.256",
+		}
+		_, err := r.prepareTrustedCIDRs()
+
+		assert.Error(t, err)
+	}
+
+	// nil value
+	{
+		r.TrustedProxies = nil
+		trustedCIDRs, err := r.prepareTrustedCIDRs()
+
+		assert.Nil(t, trustedCIDRs)
+		assert.Nil(t, err)
+	}
+
+}
+
+func parseCIDR(cidr string) *net.IPNet {
+	_, parsedCIDR, err := net.ParseCIDR(cidr)
+	if err != nil {
+		fmt.Println(err)
+	}
+	return parsedCIDR
+}
+
 func assertRoutePresent(t *testing.T, gotRoutes RoutesInfo, wantRoute RouteInfo) {
 	for _, gotRoute := range gotRoutes {
 		if gotRoute.Path == wantRoute.Path && gotRoute.Method == wantRoute.Method {
--- a/go.sum
+++ b/go.sum
@ -11,6 +11,8 @@ github.com/go-playground/universal-translator v0.17.0 h1:icxd5fm+REJzpZx7ZfpaD87
 github.com/go-playground/universal-translator v0.17.0/go.mod h1:UkSxE5sNxxRwHyU+Scu5vgOQjsIJAF8j9muTVoKLVtA=
 github.com/go-playground/validator/v10 v10.4.1 h1:pH2c5ADXtd66mxoE0Zm9SUhxE20r7aM3F26W0hOn+GE=
 github.com/go-playground/validator/v10 v10.4.1/go.mod h1:nlOn6nFhuKACm19sB/8EGNn9GlaMV7XkbRSipzJ0Ii4=
+github.com/goccy/go-json v0.4.11 h1:92nyX606ZN/cUFwctfxwDWm8YWSA38Zlv9s7taFeLyo=
+github.com/goccy/go-json v0.4.11/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
 github.com/golang/protobuf v1.3.3 h1:gyjaxf+svBWX08ZjK86iN9geUJF0H6gp2IRKX6Nf6/I=
 github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
--- a/internal/bytesconv/bytesconv.go
+++ b/internal/bytesconv/bytesconv.go
@ -5,16 +5,17 @@
 package bytesconv

 import (
-	"reflect"
 	"unsafe"
 )

 // StringToBytes converts string to byte slice without a memory allocation.
-func StringToBytes(s string) (b []byte) {
-	sh := *(*reflect.StringHeader)(unsafe.Pointer(&s))
-	bh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
-	bh.Data, bh.Len, bh.Cap = sh.Data, sh.Len, sh.Len
-	return b
+func StringToBytes(s string) []byte {
+	return *(*[]byte)(unsafe.Pointer(
+		&struct {
+			string
+			Cap int
+		}{s, len(s)},
+	))
 }

 // BytesToString converts byte slice to string without a memory allocation.
--- a/internal/json/go_json.go
+++ b/internal/json/go_json.go
@ -0,0 +1,23 @@
+// 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
+// +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
+)
--- a/internal/json/json.go
+++ b/internal/json/json.go
@ -2,7 +2,8 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.

-// +build !jsoniter
+//go:build !jsoniter && !go_json
+// +build !jsoniter,!go_json

 package json

--- a/internal/json/jsoniter.go
+++ b/internal/json/jsoniter.go
@ -2,6 +2,7 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.

+//go:build jsoniter
 // +build jsoniter

 package json
--- a/logger_test.go
+++ b/logger_test.go
@ -185,6 +185,8 @@ func TestLoggerWithConfigFormatting(t *testing.T) {
 	buffer := new(bytes.Buffer)

 	router := New()
+	router.engine.trustedCIDRs, _ = router.engine.prepareTrustedCIDRs()
+
 	router.Use(LoggerWithConfig(LoggerConfig{
 		Output: buffer,
 		Formatter: func(param LogFormatterParams) string {
--- a/mode.go
+++ b/mode.go
@ -63,7 +63,7 @@ func SetMode(value string) {
 	case TestMode:
 		ginMode = testCode
 	default:
-		panic("gin mode unknown: " + value)
+		panic("gin mode unknown: " + value + " (available mode: debug release test)")
 	}

 	modeName = value
--- a/render/msgpack.go
+++ b/render/msgpack.go
@ -2,6 +2,7 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.

+//go:build !nomsgpack
 // +build !nomsgpack

 package render
--- a/render/render_msgpack_test.go
+++ b/render/render_msgpack_test.go
@ -2,6 +2,7 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.

+//go:build !nomsgpack
 // +build !nomsgpack

 package render
--- a/routergroup.go
+++ b/routergroup.go
@ -11,6 +11,11 @@ import (
 	"strings"
 )

+var (
+	// reg match english letters for http method name
+	regEnLetter = regexp.MustCompile("^[A-Z]+$")
+)
+
 // IRouter defines all router handle interface includes single and group router.
 type IRouter interface {
 	IRoutes
@ -87,7 +92,7 @@ func (group *RouterGroup) handle(httpMethod, relativePath string, handlers Handl
 // frequently used, non-standardized or custom methods (e.g. for internal
 // communication with a proxy).
 func (group *RouterGroup) Handle(httpMethod, relativePath string, handlers ...HandlerFunc) IRoutes {
-	if matches, err := regexp.MatchString("^[A-Z]+$", httpMethod); !matches || err != nil {
+	if matched := regEnLetter.MatchString(httpMethod); !matched {
 		panic("http method " + httpMethod + " is not valid")
 	}
 	return group.handle(httpMethod, relativePath, handlers)
--- a/routes_test.go
+++ b/routes_test.go
@ -238,7 +238,6 @@ func TestRouteParamsByName(t *testing.T) {

 		assert.True(t, ok)
 		assert.Equal(t, name, c.Param("name"))
-		assert.Equal(t, name, c.Param("name"))
 		assert.Equal(t, lastName, c.Param("last_name"))

 		assert.Empty(t, c.Param("wtf"))
@ -272,7 +271,6 @@ func TestRouteParamsByNameWithExtraSlash(t *testing.T) {

 		assert.True(t, ok)
 		assert.Equal(t, name, c.Param("name"))
-		assert.Equal(t, name, c.Param("name"))
 		assert.Equal(t, lastName, c.Param("last_name"))

 		assert.Empty(t, c.Param("wtf"))
@ -362,7 +360,9 @@ func TestRouterMiddlewareAndStatic(t *testing.T) {

 	assert.Equal(t, http.StatusOK, w.Code)
 	assert.Contains(t, w.Body.String(), "package gin")
-	assert.Equal(t, "text/plain; charset=utf-8", w.Header().Get("Content-Type"))
+	// Content-Type='text/plain; charset=utf-8' when go version <= 1.16,
+	// else, Content-Type='text/x-go; charset=utf-8'
+	assert.NotEqual(t, "", w.Header().Get("Content-Type"))
 	assert.NotEqual(t, w.Header().Get("Last-Modified"), "Mon, 02 Jan 2006 15:04:05 MST")
 	assert.Equal(t, "Mon, 02 Jan 2006 15:04:05 MST", w.Header().Get("Expires"))
 	assert.Equal(t, "Gin Framework", w.Header().Get("x-GIN"))
--- a/tree.go
+++ b/tree.go
@ -80,6 +80,16 @@ func longestCommonPrefix(a, b string) int {
 	return i
 }

+// addChild will add a child node, keeping wildcards at the end
+func (n *node) addChild(child *node) {
+	if n.wildChild && len(n.children) > 0 {
+		wildcardChild := n.children[len(n.children)-1]
+		n.children = append(n.children[:len(n.children)-1], child, wildcardChild)
+	} else {
+		n.children = append(n.children, child)
+	}
+}
+
 func countParams(path string) uint16 {
 	var n uint16
 	s := bytesconv.StringToBytes(path)
@ -103,7 +113,7 @@ type node struct {
 	wildChild bool
 	nType     nodeType
 	priority  uint32
-	children  []*node
+	children  []*node // child nodes, at most 1 :param style node at the end of the array
 	handlers  HandlersChain
 	fullPath  string
 }
@ -119,7 +129,6 @@ func (n *node) incrementChildPrio(pos int) int {
 	for ; newPos > 0 && cs[newPos-1].priority < prio; newPos-- {
 		// Swap node positions
 		cs[newPos-1], cs[newPos] = cs[newPos], cs[newPos-1]
-
 	}

 	// Build new index char string
@ -178,36 +187,9 @@ walk:
 		// Make new node a child of this node
 		if i < len(path) {
 			path = path[i:]
-
-			if n.wildChild {
-				parentFullPathIndex += len(n.path)
-				n = n.children[0]
-				n.priority++
-
-				// Check if the wildcard matches
-				if len(path) >= len(n.path) && n.path == path[:len(n.path)] &&
-					// Adding a child to a catchAll is not possible
-					n.nType != catchAll &&
-					// Check for longer wildcard, e.g. :name and :names
-					(len(n.path) >= len(path) || path[len(n.path)] == '/') {
-					continue walk
-				}
-
-				pathSeg := path
-				if n.nType != catchAll {
-					pathSeg = strings.SplitN(path, "/", 2)[0]
-				}
-				prefix := fullPath[:strings.Index(fullPath, pathSeg)] + n.path
-				panic("'" + pathSeg +
-					"' in new path '" + fullPath +
-					"' conflicts with existing wildcard '" + n.path +
-					"' in existing prefix '" + prefix +
-					"'")
-			}
-
 			c := path[0]

-			// slash after param
+			// '/' after param
 			if n.nType == param && c == '/' && len(n.children) == 1 {
 				parentFullPathIndex += len(n.path)
 				n = n.children[0]
@ -226,21 +208,47 @@ walk:
 			}

 			// Otherwise insert it
-			if c != ':' && c != '*' {
+			if c != ':' && c != '*' && n.nType != catchAll {
 				// []byte for proper unicode char conversion, see #65
 				n.indices += bytesconv.BytesToString([]byte{c})
 				child := &node{
 					fullPath: fullPath,
 				}
-				n.children = append(n.children, child)
+				n.addChild(child)
 				n.incrementChildPrio(len(n.indices) - 1)
 				n = child
+			} else if n.wildChild {
+				// inserting a wildcard node, need to check if it conflicts with the existing wildcard
+				n = n.children[len(n.children)-1]
+				n.priority++
+
+				// Check if the wildcard matches
+				if len(path) >= len(n.path) && n.path == path[:len(n.path)] &&
+					// Adding a child to a catchAll is not possible
+					n.nType != catchAll &&
+					// Check for longer wildcard, e.g. :name and :names
+					(len(n.path) >= len(path) || path[len(n.path)] == '/') {
+					continue walk
+				}
+
+				// Wildcard conflict
+				pathSeg := path
+				if n.nType != catchAll {
+					pathSeg = strings.SplitN(pathSeg, "/", 2)[0]
+				}
+				prefix := fullPath[:strings.Index(fullPath, pathSeg)] + n.path
+				panic("'" + pathSeg +
+					"' in new path '" + fullPath +
+					"' conflicts with existing wildcard '" + n.path +
+					"' in existing prefix '" + prefix +
+					"'")
 			}
+
 			n.insertChild(path, fullPath, handlers)
 			return
 		}

-		// Otherwise and handle to current node
+		// Otherwise add handle to current node
 		if n.handlers != nil {
 			panic("handlers are already registered for path '" + fullPath + "'")
 		}
@ -294,13 +302,6 @@ func (n *node) insertChild(path string, fullPath string, handlers HandlersChain)
 			panic("wildcards must be named with a non-empty name in path '" + fullPath + "'")
 		}

-		// Check if this node has existing children which would be
-		// unreachable if we insert the wildcard here
-		if len(n.children) > 0 {
-			panic("wildcard segment '" + wildcard +
-				"' conflicts with existing children in path '" + fullPath + "'")
-		}
-
 		if wildcard[0] == ':' { // param
 			if i > 0 {
 				// Insert prefix before the current wildcard
@ -308,13 +309,13 @@ func (n *node) insertChild(path string, fullPath string, handlers HandlersChain)
 				path = path[i:]
 			}

-			n.wildChild = true
 			child := &node{
 				nType:    param,
 				path:     wildcard,
 				fullPath: fullPath,
 			}
-			n.children = []*node{child}
+			n.addChild(child)
+			n.wildChild = true
 			n = child
 			n.priority++

@ -327,7 +328,7 @@ func (n *node) insertChild(path string, fullPath string, handlers HandlersChain)
 					priority: 1,
 					fullPath: fullPath,
 				}
-				n.children = []*node{child}
+				n.addChild(child)
 				n = child
 				continue
 			}
@ -361,7 +362,7 @@ func (n *node) insertChild(path string, fullPath string, handlers HandlersChain)
 			fullPath:  fullPath,
 		}

-		n.children = []*node{child}
+		n.addChild(child)
 		n.indices = string('/')
 		n = child
 		n.priority++
@ -405,18 +406,18 @@ walk: // Outer loop for walking the tree
 		if len(path) > len(prefix) {
 			if path[:len(prefix)] == prefix {
 				path = path[len(prefix):]
-				// If this node does not have a wildcard (param or catchAll)
-				// child, we can just look up the next child node and continue
-				// to walk down the tree
-				if !n.wildChild {
-					idxc := path[0]
-					for i, c := range []byte(n.indices) {
-						if c == idxc {
-							n = n.children[i]
-							continue walk
-						}
-					}

+				// Try all the non-wildcard children first by matching the indices
+				idxc := path[0]
+				for i, c := range []byte(n.indices) {
+					if c == idxc {
+						n = n.children[i]
+						continue walk
+					}
+				}
+
+				// If there is no wildcard pattern, recommend a redirection
+				if !n.wildChild {
 					// Nothing found.
 					// We can recommend to redirect to the same URL without a
 					// trailing slash if a leaf exists for that path.
@ -424,8 +425,9 @@ walk: // Outer loop for walking the tree
 					return
 				}

-				// Handle wildcard child
-				n = n.children[0]
+				// Handle wildcard child, which is always at the end of the array
+				n = n.children[len(n.children)-1]
+
 				switch n.nType {
 				case param:
 					// Find param end (either '/' or path end)
@ -559,8 +561,8 @@ func (n *node) findCaseInsensitivePath(path string, fixTrailingSlash bool) ([]by
 	// Use a static sized buffer on the stack in the common case.
 	// If the path is too long, allocate a buffer on the heap instead.
 	buf := make([]byte, 0, stackBufSize)
-	if l := len(path) + 1; l > stackBufSize {
-		buf = make([]byte, 0, l)
+	if length := len(path) + 1; length > stackBufSize {
+		buf = make([]byte, 0, length)
 	}

 	ciPath := n.findCaseInsensitivePathRec(
@ -600,142 +602,7 @@ walk: // Outer loop for walking the tree
 		path = path[npLen:]
 		ciPath = append(ciPath, n.path...)

-		if len(path) > 0 {
-			// If this node does not have a wildcard (param or catchAll) child,
-			// we can just look up the next child node and continue to walk down
-			// the tree
-			if !n.wildChild {
-				// Skip rune bytes already processed
-				rb = shiftNRuneBytes(rb, npLen)
-
-				if rb[0] != 0 {
-					// Old rune not finished
-					idxc := rb[0]
-					for i, c := range []byte(n.indices) {
-						if c == idxc {
-							// continue with child node
-							n = n.children[i]
-							npLen = len(n.path)
-							continue walk
-						}
-					}
-				} else {
-					// Process a new rune
-					var rv rune
-
-					// Find rune start.
-					// Runes are up to 4 byte long,
-					// -4 would definitely be another rune.
-					var off int
-					for max := min(npLen, 3); off < max; off++ {
-						if i := npLen - off; utf8.RuneStart(oldPath[i]) {
-							// read rune from cached path
-							rv, _ = utf8.DecodeRuneInString(oldPath[i:])
-							break
-						}
-					}
-
-					// Calculate lowercase bytes of current rune
-					lo := unicode.ToLower(rv)
-					utf8.EncodeRune(rb[:], lo)
-
-					// Skip already processed bytes
-					rb = shiftNRuneBytes(rb, off)
-
-					idxc := rb[0]
-					for i, c := range []byte(n.indices) {
-						// Lowercase matches
-						if c == idxc {
-							// must use a recursive approach since both the
-							// uppercase byte and the lowercase byte might exist
-							// as an index
-							if out := n.children[i].findCaseInsensitivePathRec(
-								path, ciPath, rb, fixTrailingSlash,
-							); out != nil {
-								return out
-							}
-							break
-						}
-					}
-
-					// If we found no match, the same for the uppercase rune,
-					// if it differs
-					if up := unicode.ToUpper(rv); up != lo {
-						utf8.EncodeRune(rb[:], up)
-						rb = shiftNRuneBytes(rb, off)
-
-						idxc := rb[0]
-						for i, c := range []byte(n.indices) {
-							// Uppercase matches
-							if c == idxc {
-								// Continue with child node
-								n = n.children[i]
-								npLen = len(n.path)
-								continue walk
-							}
-						}
-					}
-				}
-
-				// Nothing found. We can recommend to redirect to the same URL
-				// without a trailing slash if a leaf exists for that path
-				if fixTrailingSlash && path == "/" && n.handlers != nil {
-					return ciPath
-				}
-				return nil
-			}
-
-			n = n.children[0]
-			switch n.nType {
-			case param:
-				// Find param end (either '/' or path end)
-				end := 0
-				for end < len(path) && path[end] != '/' {
-					end++
-				}
-
-				// Add param value to case insensitive path
-				ciPath = append(ciPath, path[:end]...)
-
-				// We need to go deeper!
-				if end < len(path) {
-					if len(n.children) > 0 {
-						// Continue with child node
-						n = n.children[0]
-						npLen = len(n.path)
-						path = path[end:]
-						continue
-					}
-
-					// ... but we can't
-					if fixTrailingSlash && len(path) == end+1 {
-						return ciPath
-					}
-					return nil
-				}
-
-				if n.handlers != nil {
-					return ciPath
-				}
-
-				if fixTrailingSlash && len(n.children) == 1 {
-					// No handle found. Check if a handle for this path + a
-					// trailing slash exists
-					n = n.children[0]
-					if n.path == "/" && n.handlers != nil {
-						return append(ciPath, '/')
-					}
-				}
-
-				return nil
-
-			case catchAll:
-				return append(ciPath, path...)
-
-			default:
-				panic("invalid node type")
-			}
-		} else {
+		if len(path) == 0 {
 			// We should have reached the node containing the handle.
 			// Check if this node has a handle registered.
 			if n.handlers != nil {
@ -758,6 +625,141 @@ walk: // Outer loop for walking the tree
 			}
 			return nil
 		}
+
+		// If this node does not have a wildcard (param or catchAll) child,
+		// we can just look up the next child node and continue to walk down
+		// the tree
+		if !n.wildChild {
+			// Skip rune bytes already processed
+			rb = shiftNRuneBytes(rb, npLen)
+
+			if rb[0] != 0 {
+				// Old rune not finished
+				idxc := rb[0]
+				for i, c := range []byte(n.indices) {
+					if c == idxc {
+						// continue with child node
+						n = n.children[i]
+						npLen = len(n.path)
+						continue walk
+					}
+				}
+			} else {
+				// Process a new rune
+				var rv rune
+
+				// Find rune start.
+				// Runes are up to 4 byte long,
+				// -4 would definitely be another rune.
+				var off int
+				for max := min(npLen, 3); off < max; off++ {
+					if i := npLen - off; utf8.RuneStart(oldPath[i]) {
+						// read rune from cached path
+						rv, _ = utf8.DecodeRuneInString(oldPath[i:])
+						break
+					}
+				}
+
+				// Calculate lowercase bytes of current rune
+				lo := unicode.ToLower(rv)
+				utf8.EncodeRune(rb[:], lo)
+
+				// Skip already processed bytes
+				rb = shiftNRuneBytes(rb, off)
+
+				idxc := rb[0]
+				for i, c := range []byte(n.indices) {
+					// Lowercase matches
+					if c == idxc {
+						// must use a recursive approach since both the
+						// uppercase byte and the lowercase byte might exist
+						// as an index
+						if out := n.children[i].findCaseInsensitivePathRec(
+							path, ciPath, rb, fixTrailingSlash,
+						); out != nil {
+							return out
+						}
+						break
+					}
+				}
+
+				// If we found no match, the same for the uppercase rune,
+				// if it differs
+				if up := unicode.ToUpper(rv); up != lo {
+					utf8.EncodeRune(rb[:], up)
+					rb = shiftNRuneBytes(rb, off)
+
+					idxc := rb[0]
+					for i, c := range []byte(n.indices) {
+						// Uppercase matches
+						if c == idxc {
+							// Continue with child node
+							n = n.children[i]
+							npLen = len(n.path)
+							continue walk
+						}
+					}
+				}
+			}
+
+			// Nothing found. We can recommend to redirect to the same URL
+			// without a trailing slash if a leaf exists for that path
+			if fixTrailingSlash && path == "/" && n.handlers != nil {
+				return ciPath
+			}
+			return nil
+		}
+
+		n = n.children[0]
+		switch n.nType {
+		case param:
+			// Find param end (either '/' or path end)
+			end := 0
+			for end < len(path) && path[end] != '/' {
+				end++
+			}
+
+			// Add param value to case insensitive path
+			ciPath = append(ciPath, path[:end]...)
+
+			// We need to go deeper!
+			if end < len(path) {
+				if len(n.children) > 0 {
+					// Continue with child node
+					n = n.children[0]
+					npLen = len(n.path)
+					path = path[end:]
+					continue
+				}
+
+				// ... but we can't
+				if fixTrailingSlash && len(path) == end+1 {
+					return ciPath
+				}
+				return nil
+			}
+
+			if n.handlers != nil {
+				return ciPath
+			}
+
+			if fixTrailingSlash && len(n.children) == 1 {
+				// No handle found. Check if a handle for this path + a
+				// trailing slash exists
+				n = n.children[0]
+				if n.path == "/" && n.handlers != nil {
+					return append(ciPath, '/')
+				}
+			}
+
+			return nil
+
+		case catchAll:
+			return append(ciPath, path...)
+
+		default:
+			panic("invalid node type")
+		}
 	}

 	// Nothing found.
--- a/tree_test.go
+++ b/tree_test.go
@ -137,6 +137,8 @@ func TestTreeWildcard(t *testing.T) {
 		"/",
 		"/cmd/:tool/:sub",
 		"/cmd/:tool/",
+		"/cmd/whoami",
+		"/cmd/whoami/root/",
 		"/src/*filepath",
 		"/search/",
 		"/search/:query",
@ -155,8 +157,12 @@ func TestTreeWildcard(t *testing.T) {

 	checkRequests(t, tree, testRequests{
 		{"/", false, "/", nil},
-		{"/cmd/test/", false, "/cmd/:tool/", Params{Param{Key: "tool", Value: "test"}}},
-		{"/cmd/test", true, "", Params{Param{Key: "tool", Value: "test"}}},
+		{"/cmd/test", true, "/cmd/:tool/", Params{Param{"tool", "test"}}},
+		{"/cmd/test/", false, "/cmd/:tool/", Params{Param{"tool", "test"}}},
+		{"/cmd/whoami", false, "/cmd/whoami", nil},
+		{"/cmd/whoami/", true, "/cmd/whoami", nil},
+		{"/cmd/whoami/root/", false, "/cmd/whoami/root/", nil},
+		{"/cmd/whoami/root", true, "/cmd/whoami/root/", nil},
 		{"/cmd/test/3", false, "/cmd/:tool/:sub", Params{Param{Key: "tool", Value: "test"}, Param{Key: "sub", Value: "3"}}},
 		{"/src/", false, "/src/*filepath", Params{Param{Key: "filepath", Value: "/"}}},
 		{"/src/some/file.png", false, "/src/*filepath", Params{Param{Key: "filepath", Value: "/some/file.png"}}},
@ -245,20 +251,38 @@ func testRoutes(t *testing.T, routes []testRoute) {
 func TestTreeWildcardConflict(t *testing.T) {
 	routes := []testRoute{
 		{"/cmd/:tool/:sub", false},
-		{"/cmd/vet", true},
+		{"/cmd/vet", false},
+		{"/foo/bar", false},
+		{"/foo/:name", false},
+		{"/foo/:names", true},
+		{"/cmd/*path", true},
+		{"/cmd/:badvar", true},
+		{"/cmd/:tool/names", false},
+		{"/cmd/:tool/:badsub/details", true},
 		{"/src/*filepath", false},
+		{"/src/:file", true},
+		{"/src/static.json", true},
 		{"/src/*filepathx", true},
 		{"/src/", true},
+		{"/src/foo/bar", true},
 		{"/src1/", false},
 		{"/src1/*filepath", true},
 		{"/src2*filepath", true},
+		{"/src2/*filepath", false},
 		{"/search/:query", false},
-		{"/search/invalid", true},
+		{"/search/valid", false},
 		{"/user_:name", false},
-		{"/user_x", true},
+		{"/user_x", false},
 		{"/user_:name", false},
 		{"/id:id", false},
-		{"/id/:id", true},
+		{"/id/:id", false},
+	}
+	testRoutes(t, routes)
+}
+
+func TestCatchAllAfterSlash(t *testing.T) {
+	routes := []testRoute{
+		{"/non-leading-*catchall", true},
 	}
 	testRoutes(t, routes)
 }
@ -266,14 +290,17 @@ func TestTreeWildcardConflict(t *testing.T) {
 func TestTreeChildConflict(t *testing.T) {
 	routes := []testRoute{
 		{"/cmd/vet", false},
-		{"/cmd/:tool/:sub", true},
+		{"/cmd/:tool", false},
+		{"/cmd/:tool/:sub", false},
+		{"/cmd/:tool/misc", false},
+		{"/cmd/:tool/:othersub", true},
 		{"/src/AUTHORS", false},
 		{"/src/*filepath", true},
 		{"/user_x", false},
-		{"/user_:name", true},
+		{"/user_:name", false},
 		{"/id/:id", false},
-		{"/id:id", true},
-		{"/:id", true},
+		{"/id:id", false},
+		{"/:id", false},
 		{"/*filepath", true},
 	}
 	testRoutes(t, routes)
@ -688,8 +715,7 @@ func TestTreeWildcardConflictEx(t *testing.T) {
 		{"/who/are/foo", "/foo", `/who/are/\*you`, `/\*you`},
 		{"/who/are/foo/", "/foo/", `/who/are/\*you`, `/\*you`},
 		{"/who/are/foo/bar", "/foo/bar", `/who/are/\*you`, `/\*you`},
-		{"/conxxx", "xxx", `/con:tact`, `:tact`},
-		{"/conooo/xxx", "ooo", `/con:tact`, `:tact`},
+		{"/con:nection", ":nection", `/con:tact`, `:tact`},
 	}

 	for _, conflict := range conflicts {
--- a/version.go
+++ b/version.go
@ -5,4 +5,4 @@
 package gin

 // Version is the current gin framework's version.
-const Version = "v1.6.3"
+const Version = "v1.7.1"