Merge branch 'master' into master

2025-02-02 07:20:35 +01:00 · 2021-01-09 03:37:54 +02:00 · 2021-01-09 03:37:54 +02:00 · 387eac8672
commit 387eac8672
parent 8ab500bd6c cd1f82a08f
43 changed files with 747 additions and 478 deletions
--- a/.deepsource.toml
+++ b/.deepsource.toml
@ -14,4 +14,3 @@ enabled = true

  [analyzers.meta]
  import_paths = ["github.com/kataras/iris"]
-
--- a/.gitignore
+++ b/.gitignore
@ -3,6 +3,7 @@
 coverage.out
 package-lock.json
 go.sum
+access.log
 node_modules
 issue-*/
 internalcode-*/
--- a/HISTORY.md
+++ b/HISTORY.md
@ -28,6 +28,29 @@ The codebase for Dependency Injection, Internationalization and localization and

 ## Fixes and Improvements

+- New `versioning.Aliases` middleware and up to 80% faster version resolve. Example Code:
+
+```go
+app := iris.New()
+
+api := app.Party("/api")
+api.Use(Aliases(map[string]string{
+    versioning.Empty: "1", // when no version was provided by the client.
+    "beta": "4.0.0",
+    "stage": "5.0.0-alpha"
+}))
+
+v1 := NewGroup(api, ">=1.0.0 <2.0.0")
+v1.Get/Post...
+
+v4 := NewGroup(api, ">=4.0.0 <5.0.0")
+v4.Get/Post...
+
+stage := NewGroup(api, "5.0.0-alpha")
+stage.Get/Post...
+```
+
+- New [Basic Authentication](https://github.com/kataras/iris/tree/master/middleware/basicauth) middleware. Its `Default` function has not changed, however, the rest, e.g. `New` contains breaking changes as the new middleware features new functionalities.
 - Add `iris.DirOptions.SPA bool` field to allow [Single Page Applications](https://github.com/kataras/iris/tree/master/_examples/file-server/single-page-application/basic/main.go) under a file server.
 - A generic User interface, see the `Context.SetUser/User` methods in the New Context Methods section for more. In-short, the basicauth middleware's stored user can now be retrieved through `Context.User()` which provides more information than the native `ctx.Request().BasicAuth()` method one. Third-party authentication middleware creators can benefit of these two methods, plus the Logout below. 
 - A `Context.Logout` method is added, can be used to invalidate [basicauth](https://github.com/kataras/iris/blob/master/_examples/auth/basicauth/basic/main.go) or [jwt](https://github.com/kataras/iris/blob/master/_examples/auth/jwt/blocklist/main.go) client credentials.
@ -700,6 +723,7 @@ Response:

 ## Breaking Changes

+- The `versioning.NewMatcher` has been removed entirely in favor of `NewGroup`. Strict versions format on `versioning.NewGroup` is required. E.g. `"1"` is not valid anymore, you have to specify `"1.0.0"`. Example: `NewGroup(api, ">=1.0.0 <2.0.0")`. The [routing/versioning](_examples/routing/versioning) examples have been updated.
 - Now that `RegisterView` can be used to register different view engines per-Party, there is no need to support registering multiple engines under the same Party. The `app.RegisterView` now upserts the given Engine instead of append. You can now render templates **without file extension**, e.g. `index` instead of `index.ace`, both forms are valid now.
 - The `Context.ContentType` does not accept filenames to resolve the mime type anymore (caused issues with  vendor-specific(vnd) MIME types).
 - The `Configuration.RemoteAddrPrivateSubnets.IPRange.Start and End` are now type of `string` instead of `net.IP`. The `WithRemoteAddrPrivateSubnet` option remains as it is, already accepts `string`s.
--- a/6
+++ b/6
@ -44,9 +44,9 @@ Revision ID: 5fc50a00491616d5cd0cbce3abd8b699838e25ca
 easyjson            8ab5ff9cd8e4e43     https://github.com/mailru/easyjson
                     2e8b79f6c47d324
                     a31dd803cf
- go-version          2b13044f5cdd383     https://github.com/hashicorp/go-version  
-                     3370d41ce57d8bf                                              
-                     3cec5e62b8                                                                                                    
+ semver              4487282d78122a2     https://github.com/blang/semver 
+                     45e413d7515e7c5                                              
+                     16b70c33fd                                                                                                        
 golog               f7561df84e64ab9     https://github.com/kataras/golog         
                     212f021923ce4ff                                              
                     db5df5594d                                                           
--- a/README.md
+++ b/README.md
@ -1,10 +1,15 @@
 [![Black Lives Matter](https://iris-go.com/images/blacklivesmatter_banner.png)](https://support.eji.org/give/153413/#!/donation/checkout)

-<!-- # News -->
+<!-- # News 

 > This is the under-**development branch**. Stay tuned for the upcoming release [v12.2.0](HISTORY.md#Next). Looking for a stable release? Head over to the [v12.1.8 branch](https://github.com/kataras/iris/tree/v12.1.8) instead.
 > 
 > ![](https://iris-go.com/images/cli.png) Try the official [Iris Command Line Interface](https://github.com/kataras/iris-cli) today!
+-->
+
+# Happy New Year 🎉
+
+Thank you for being with us every step of the way in 2020. I hope the next years brings you only good luck and great joy.

 <!-- ![](https://iris-go.com/images/release.png) Iris version **12.1.8** has been [released](HISTORY.md#su-16-february-2020--v1218)! -->

@ -31,6 +36,13 @@ With your help, we can improve Open Source web development for everyone!
 > Donations from **China** are now accepted!

 <p>
+  <a href="https://github.com/motogo"><img src="https://avatars1.githubusercontent.com/u/1704958?v=4" alt ="Horst Ender" title="motogo" with="75" style="width:75px;max-width:75px;height:75px" height="75" /></a>
+  <a href="https://github.com/remopavithran"><img src="https://avatars1.githubusercontent.com/u/50388068?v=4" alt ="Pavithran" title="remopavithran" with="75" style="width:75px;max-width:75px;height:75px" height="75" /></a>
+  <a href="https://github.com/mulyawansentosa"><img src="https://avatars1.githubusercontent.com/u/29946673?v=4" alt ="MULYAWAN SENTOSA" title="mulyawansentosa" with="75" style="width:75px;max-width:75px;height:75px" height="75" /></a>
+  <a href="https://github.com/TianJIANG"><img src="https://avatars1.githubusercontent.com/u/158459?v=4" alt ="KIT UNITED" title="TianJIANG" with="75" style="width:75px;max-width:75px;height:75px" height="75" /></a>
+  <a href="https://github.com/rhernandez-itemsoft"><img src="https://avatars1.githubusercontent.com/u/4327356?v=4" alt ="Ricardo Hernandez Lopez" title="rhernandez-itemsoft" with="75" style="width:75px;max-width:75px;height:75px" height="75" /></a>
+  <a href="https://github.com/ChinChuanKuo"><img src="https://avatars1.githubusercontent.com/u/11756978?v=4" alt ="ChinChuanKuo" title="ChinChuanKuo" with="75" style="width:75px;max-width:75px;height:75px" height="75" /></a>
+  <a href="https://github.com/nikharsaxena"><img src="https://avatars1.githubusercontent.com/u/8684362?v=4" alt ="Nikhar Saxena" title="nikharsaxena" with="75" style="width:75px;max-width:75px;height:75px" height="75" /></a>
  <a href="https://github.com/fenriz07"><img src="https://avatars1.githubusercontent.com/u/9199380?v=4" alt ="Servio Zambrano" title="fenriz07" with="75" style="width:75px;max-width:75px;height:75px" height="75" /></a>
  <a href="https://github.com/NA"><img src="https://avatars1.githubusercontent.com/u/1600?v=4" alt ="Nate Anderson" title="NA" with="75" style="width:75px;max-width:75px;height:75px" height="75" /></a>
  <a href="https://github.com/claudemuller"><img src="https://avatars1.githubusercontent.com/u/8104894?v=4" alt ="Claude Muller" title="claudemuller" with="75" style="width:75px;max-width:75px;height:75px" height="75" /></a>
--- a/_examples/auth/basicauth/basic/main.go
+++ b/_examples/auth/basicauth/basic/main.go
@ -64,14 +64,11 @@ func main() {
 }

 func handler(ctx iris.Context) {
-	// username, password, _ := ctx.Request().BasicAuth()
-	// third parameter it will be always true because the middleware
-	// makes sure for that, otherwise this handler will not be executed.
-	// OR:
-	user := ctx.User()
-	// OR ctx.User().GetRaw() to get the underline value.
-	username, _ := user.GetUsername()
-	password, _ := user.GetPassword()
+	// user := ctx.User().(*myUserType)
+	// or ctx.User().GetRaw().(*myUserType)
+	// ctx.Writef("%s %s:%s", ctx.Path(), user.Username, user.Password)
+	// OR if you don't have registered custom User structs:
+	username, password, _ := ctx.Request().BasicAuth()
 	ctx.Writef("%s %s:%s", ctx.Path(), username, password)
 }

--- a/_examples/auth/jwt/basic/main.go
+++ b/_examples/auth/jwt/basic/main.go
@ -4,16 +4,10 @@ import (
 	"time"

 	"github.com/kataras/iris/v12"
-	"github.com/kataras/jwt"
+	"github.com/kataras/iris/v12/middleware/jwt"
 )

 /*
-Learn how to use any JWT 3rd-party package with Iris.
-In this example we use the kataras/jwt one.
-
-Install with:
-    go get -u github.com/kataras/jwt
-
 Documentation:
    https://github.com/kataras/jwt#table-of-contents
 */
@ -71,6 +65,7 @@ func protected(ctx iris.Context) {

 	// Just an example on how you can retrieve all the standard claims (set by jwt.MaxAge, "exp").
 	standardClaims := jwt.GetVerifiedToken(ctx).StandardClaims
+
 	expiresAtString := standardClaims.ExpiresAt().Format(ctx.Application().ConfigurationReadOnly().GetTimeFormat())
 	timeLeft := standardClaims.Timeleft()

--- a/_examples/mvc/error-handler-preflight/main.go
+++ b/_examples/mvc/error-handler-preflight/main.go
@ -29,7 +29,7 @@ type response struct {
 	Timestamp int64       `json:"timestamp,omitempty"`
 }

-func (r response) Preflight(ctx iris.Context) error {
+func (r *response) Preflight(ctx iris.Context) error {
 	if r.ID > 0 {
 		r.Timestamp = time.Now().Unix()
 	}
@ -64,15 +64,15 @@ type user struct {
 	ID uint64 `json:"id"`
 }

-func (c *controller) GetBy(userid uint64) response {
+func (c *controller) GetBy(userid uint64) *response {
 	if userid != 1 {
-		return response{
+		return &response{
 			Code:    iris.StatusNotFound,
 			Message: "User Not Found",
 		}
 	}

-	return response{
+	return &response{
 		ID:   userid,
 		Data: user{ID: userid},
 	}
--- a/_examples/mvc/versioned-controller/main.go
+++ b/_examples/mvc/versioned-controller/main.go
@ -28,10 +28,10 @@ func newApp() *iris.Application {
 	{
 		m := mvc.New(dataRouter)

-		m.Handle(new(v1Controller), mvc.Version("1"), mvc.Deprecated(opts)) // 1 or 1.0, 1.0.0 ...
-		m.Handle(new(v2Controller), mvc.Version("2.3"))                     // 2.3 or 2.3.0
-		m.Handle(new(v3Controller), mvc.Version(">=3, <4"))                 // 3, 3.x, 3.x.x ...
-		m.Handle(new(noVersionController))                                  // or if missing it will respond with 501 version not found.
+		m.Handle(new(v1Controller), mvc.Version("1.0.0"), mvc.Deprecated(opts))
+		m.Handle(new(v2Controller), mvc.Version("2.3.0"))
+		m.Handle(new(v3Controller), mvc.Version(">=3.0.0 <4.0.0"))
+		m.Handle(new(noVersionController)) // or if missing it will respond with 501 version not found.
 	}

 	return app
--- a/_examples/mvc/versioned-controller/main_test.go
+++ b/_examples/mvc/versioned-controller/main_test.go
@ -12,21 +12,21 @@ func TestVersionedController(t *testing.T) {
 	app := newApp()

 	e := httptest.New(t, app)
-	e.GET("/data").WithHeader(versioning.AcceptVersionHeaderKey, "1").Expect().
+	e.GET("/data").WithHeader(versioning.AcceptVersionHeaderKey, "1.0.0").Expect().
 		Status(iris.StatusOK).Body().Equal("data (v1.x)")
 	e.GET("/data").WithHeader(versioning.AcceptVersionHeaderKey, "2.3.0").Expect().
 		Status(iris.StatusOK).Body().Equal("data (v2.x)")
-	e.GET("/data").WithHeader(versioning.AcceptVersionHeaderKey, "3.1").Expect().
+	e.GET("/data").WithHeader(versioning.AcceptVersionHeaderKey, "3.1.0").Expect().
 		Status(iris.StatusOK).Body().Equal("data (v3.x)")

 	// Test invalid version or no version at all.
-	e.GET("/data").WithHeader(versioning.AcceptVersionHeaderKey, "4").Expect().
+	e.GET("/data").WithHeader(versioning.AcceptVersionHeaderKey, "4.0.0").Expect().
 		Status(iris.StatusOK).Body().Equal("data")
 	e.GET("/data").Expect().
 		Status(iris.StatusOK).Body().Equal("data")

 	// Test Deprecated (v1)
-	ex := e.GET("/data").WithHeader(versioning.AcceptVersionHeaderKey, "1.0").Expect()
+	ex := e.GET("/data").WithHeader(versioning.AcceptVersionHeaderKey, "1.0.0").Expect()
 	ex.Status(iris.StatusOK).Body().Equal("data (v1.x)")
 	ex.Header("X-API-Warn").Equal(opts.WarnMessage)
 	expectedDateStr := opts.DeprecationDate.Format(app.ConfigurationReadOnly().GetTimeFormat())
--- a/_examples/routing/basic/main.go
+++ b/_examples/routing/basic/main.go
@ -152,7 +152,7 @@ func newApp() *iris.Application {
 	}

 	// wildcard subdomains.
-	wildcardSubdomain := app.Party("*.")
+	wildcardSubdomain := app.WildcardSubdomain()
 	{
 		wildcardSubdomain.Get("/", func(ctx iris.Context) {
 			ctx.Writef("Subdomain can be anything, now you're here from: %s", ctx.Subdomain())
--- a/_examples/routing/main.go
+++ b/_examples/routing/main.go
@ -82,11 +82,11 @@ func registerGamesRoutes(app *iris.Application) {
 }

 func registerSubdomains(app *iris.Application) {
-	mysubdomain := app.Party("mysubdomain.")
+	mysubdomain := app.Subdomain("mysubdomain")
 	// http://mysubdomain.myhost.com
 	mysubdomain.Get("/", h)

-	willdcardSubdomain := app.Party("*.")
+	willdcardSubdomain := app.WildcardSubdomain()
 	willdcardSubdomain.Get("/", h)
 	willdcardSubdomain.Party("/party").Get("/", h)
 }
--- a/_examples/routing/overview/main.go
+++ b/_examples/routing/overview/main.go
@ -116,7 +116,7 @@ func main() {
 	adminRoutes.Get("/settings", info)

 	// Wildcard/dynamic subdomain
-	dynamicSubdomainRoutes := app.Party("*.")
+	dynamicSubdomainRoutes := app.WildcardSubdomain()

 	// GET: http://any_thing_here.localhost:8080
 	dynamicSubdomainRoutes.Get("/", info)
--- a/_examples/routing/subdomains/wildcard/main.go
+++ b/_examples/routing/subdomains/wildcard/main.go
@ -33,7 +33,7 @@ func main() {
 	}*/

 	// no order, you can register subdomains at the end also.
-	dynamicSubdomains := app.Party("*.")
+	dynamicSubdomains := app.WildcardSubdomain()
 	{
 		dynamicSubdomains.Get("/", dynamicSubdomainHandler)

--- a/_examples/routing/versioning/main.go
+++ b/_examples/routing/versioning/main.go
@ -8,71 +8,95 @@ import (
 func main() {
 	app := iris.New()

-	examplePerRoute(app)
-	examplePerParty(app)
+	app.OnErrorCode(iris.StatusNotFound, func(ctx iris.Context) {
+		ctx.WriteString(`Root not found handler.
+        This will be applied everywhere except the /api/* requests.`)
+	})
+
+	api := app.Party("/api")
+	// Optional, set version aliases (literal strings).
+	// We use `UseRouter` instead of `Use`
+	// to handle HTTP errors per version, but it's up to you.
+	api.UseRouter(versioning.Aliases(versioning.AliasMap{
+		// If no version provided by the client, default it to the "1.0.0".
+		versioning.Empty: "1.0.0",
+		// If a "latest" version is provided by the client,
+		// set the version to be compared to "3.0.0".
+		"latest": "3.0.0",
+	}))
+
+	/*
+	   A version is extracted through the versioning.GetVersion function,
+	   request headers:
+	   - Accept-Version: 1.0.0
+	   - Accept: application/json; version=1.0.0
+	   You can customize it by setting a version based on the request context:
+	   api.Use(func(ctx *context.Context) {
+	       if version := ctx.URLParam("version"); version != "" {
+	           versioning.SetVersion(ctx, version)
+	       }
+
+	       ctx.Next()
+	   })
+	   OR: api.Use(versioning.FromQuery("version", ""))
+	*/
+
+	// |----------------|
+	// | The fun begins |
+	// |----------------|
+
+	// Create a new Group, which is a compatible Party,
+	// based on version constraints.
+	v1 := versioning.NewGroup(api, ">=1.0.0 <2.0.0")
+	// To mark an API version as deprecated use the Deprecated method.
+	// v1.Deprecated(versioning.DefaultDeprecationOptions)
+
+	// Optionally, set custom view engine and path
+	// for templates based on the version.
+	v1.RegisterView(iris.HTML("./v1", ".html"))
+
+	// Optionally, set custom error handler(s) based on the version.
+	// Keep in mind that if you do this, you will
+	// have to register error handlers
+	// for the rest of the parties as well.
+	v1.OnErrorCode(iris.StatusNotFound, testError("v1"))
+
+	// Register resources based on the version.
+	v1.Get("/", testHandler("v1"))
+	v1.Get("/render", testView)
+
+	// Do the same for version 2 and version 3,
+	// for the sake of the example.
+	v2 := versioning.NewGroup(api, ">=2.0.0 <3.0.0")
+	v2.RegisterView(iris.HTML("./v2", ".html"))
+	v2.OnErrorCode(iris.StatusNotFound, testError("v2"))
+	v2.Get("/", testHandler("v2"))
+	v2.Get("/render", testView)
+
+	v3 := versioning.NewGroup(api, ">=3.0.0 <4.0.0")
+	v3.RegisterView(iris.HTML("./v3", ".html"))
+	v3.OnErrorCode(iris.StatusNotFound, testError("v3"))
+	v3.Get("/", testHandler("v3"))
+	v3.Get("/render", testView)

-	// Read the README.md before any action.
 	app.Listen(":8080")
 }

-// How to test:
-// Open Postman
-// GET: localhost:8080/api/cats
-// Headers[1] = Accept-Version: "1" and repeat with
-// Headers[1] = Accept-Version: "2.5"
-// or even "Accept": "application/json; version=2.5"
-func examplePerRoute(app *iris.Application) {
-	app.Get("/api/cats", versioning.NewMatcher(versioning.Map{
-		"1":                 catsVersionExactly1Handler,
-		">= 2, < 3":         catsV2Handler,
-		versioning.NotFound: versioning.NotFoundHandler,
-	}))
+func testHandler(v string) iris.Handler {
+	return func(ctx iris.Context) {
+		ctx.JSON(iris.Map{
+			"version": v,
+			"message": "Hello, world!",
+		})
+	}
 }

-// How to test:
-// Open Postman
-// GET: localhost:8080/api/users
-// Headers[1] = Accept-Version: "1.9.9" and repeat with
-// Headers[1] = Accept-Version: "2.5"
-//
-// POST: localhost:8080/api/users/new
-// Headers[1] = Accept-Version: "1.8.3"
-//
-// POST: localhost:8080/api/users
-// Headers[1] = Accept-Version: "2"
-func examplePerParty(app *iris.Application) {
-	usersAPI := app.Party("/api/users")
-	// You can customize the way a version is extracting
-	// via middleware, for example:
-	// version url parameter, and, if it's missing we default it to "1".
-	usersAPI.Use(func(ctx iris.Context) {
-		versioning.SetVersion(ctx, ctx.URLParamDefault("version", "1"))
-		ctx.Next()
-	})
-
-	// version 1.
-	usersAPIV1 := versioning.NewGroup(usersAPI, ">= 1, < 2")
-	usersAPIV1.Get("/", func(ctx iris.Context) {
-		ctx.Writef("v1 resource: /api/users handler")
-	})
-	usersAPIV1.Post("/new", func(ctx iris.Context) {
-		ctx.Writef("v1 resource: /api/users/new post handler")
-	})
-
-	// version 2.
-	usersAPIV2 := versioning.NewGroup(usersAPI, ">= 2, < 3")
-	usersAPIV2.Get("/", func(ctx iris.Context) {
-		ctx.Writef("v2 resource: /api/users handler")
-	})
-	usersAPIV2.Post("/", func(ctx iris.Context) {
-		ctx.Writef("v2 resource: /api/users post handler")
-	})
+func testError(v string) iris.Handler {
+	return func(ctx iris.Context) {
+		ctx.Writef("not found: %s", v)
+	}
 }

-func catsVersionExactly1Handler(ctx iris.Context) {
-	ctx.Writef("v1 exactly resource: /api/cats handler")
-}
-
-func catsV2Handler(ctx iris.Context) {
-	ctx.Writef("v2 resource: /api/cats handler")
+func testView(ctx iris.Context) {
+	ctx.View("index.html")
 }
--- a/_examples/routing/versioning/v1/index.html
+++ b/_examples/routing/versioning/v1/index.html
@ -0,0 +1 @@
+<h1>This is the directory for version 1 templates</h1>
--- a/_examples/routing/versioning/v2/index.html
+++ b/_examples/routing/versioning/v2/index.html
@ -0,0 +1 @@
+<h1>This is the directory for version 2 templates</h1>
--- a/_examples/routing/versioning/v3/index.html
+++ b/_examples/routing/versioning/v3/index.html
@ -0,0 +1 @@
+<h1>This is the directory for version 3 templates</h1>
--- a/_examples/sessions/overview/example/example.go
+++ b/_examples/sessions/overview/example/example.go
@ -114,7 +114,7 @@ func NewApp(sess *sessions.Sessions) *iris.Application {
 	app.Get("/delete", func(ctx iris.Context) {
 		session := sessions.Get(ctx)
 		// delete a specific key
-		session.Delete("name")
+		session.Delete("username")
 	})

 	app.Get("/clear", func(ctx iris.Context) {
--- a/_examples/sessions/securecookie/main_test.go
+++ b/_examples/sessions/securecookie/main_test.go
@ -16,12 +16,12 @@ func TestSessionsEncodeDecode(t *testing.T) {
 	es.Cookies().NotEmpty()
 	es.Body().Equal("All ok session set to: iris [isNew=true]")

-	e.GET("/get").Expect().Status(iris.StatusOK).Body().Equal("The name on the /set was: iris")
+	e.GET("/get").Expect().Status(iris.StatusOK).Body().Equal("The username on the /set was: iris")
 	// delete and re-get
 	e.GET("/delete").Expect().Status(iris.StatusOK)
-	e.GET("/get").Expect().Status(iris.StatusOK).Body().Equal("The name on the /set was: ")
+	e.GET("/get").Expect().Status(iris.StatusOK).Body().Equal("The username on the /set was: ")
 	// set, clear and re-get
 	e.GET("/set").Expect().Body().Equal("All ok session set to: iris [isNew=false]")
 	e.GET("/clear").Expect().Status(iris.StatusOK)
-	e.GET("/get").Expect().Status(iris.StatusOK).Body().Equal("The name on the /set was: ")
+	e.GET("/get").Expect().Status(iris.StatusOK).Body().Equal("The username on the /set was: ")
 }
--- a/_examples/testing/httptest/main.go
+++ b/_examples/testing/httptest/main.go
@ -37,6 +37,11 @@ func h(ctx iris.Context) {
 	// third parameter it will be always true because the middleware
 	// makes sure for that, otherwise this handler will not be executed.
 	// OR:
+	//
+	// user := ctx.User().(*myUserType)
+	// ctx.Writef("%s %s:%s", ctx.Path(), user.Username, user.Password)
+	// OR if you don't have registered custom User structs:
+	//
 	// ctx.User().GetUsername()
 	// ctx.User().GetPassword()
 	ctx.Writef("%s %s:%s", ctx.Path(), username, password)
--- a/_examples/view/template_html_4/main.go
+++ b/_examples/view/template_html_4/main.go
@ -27,7 +27,7 @@ func main() {
 	// wildcard subdomain, will catch username1.... username2.... username3... username4.... username5...
 	// that our below links are providing via page.html's first argument which is the subdomain.

-	subdomain := app.Party("*.")
+	subdomain := app.WildcardSubdomain()

 	mypathRoute := subdomain.Get("/mypath", emptyHandler)
 	mypathRoute.Name = "my-page1"
--- a/configuration.go
+++ b/configuration.go
@ -764,9 +764,14 @@ type Configuration struct {
 	// Defaults to "iris.locale.language.input".
 	LanguageInputContextKey string `ini:"language_input_context_key" json:"languageInputContextKey,omitempty" yaml:"LanguageInputContextKey" toml:"LanguageInputContextKey"`
 	// VersionContextKey is the context key which an API Version can be modified
-	// via a middleware through `SetVersion` method, e.g. `versioning.SetVersion(ctx, "1.0, 1.1")`.
+	// via a middleware through `SetVersion` method, e.g. `versioning.SetVersion(ctx, ">=1.0.0 <2.0.0")`.
 	// Defaults to "iris.api.version".
 	VersionContextKey string `ini:"version_context_key" json:"versionContextKey" yaml:"VersionContextKey" toml:"VersionContextKey"`
+	// VersionAliasesContextKey is the context key which the versioning feature
+	// can look up for alternative values of a version and fallback to that.
+	// Head over to the versioning package for more.
+	// Defaults to "iris.api.version.aliases"
+	VersionAliasesContextKey string `ini:"version_aliases_context_key" json:"versionAliasesContextKey" yaml:"VersionAliasesContextKey" toml:"VersionAliasesContextKey"`
 	// ViewEngineContextKey is the context's values key
 	// responsible to store and retrieve(view.Engine) the current view engine.
 	// A middleware or a Party can modify its associated value to change
@ -974,6 +979,11 @@ func (c Configuration) GetVersionContextKey() string {
 	return c.VersionContextKey
 }

+// GetVersionAliasesContextKey returns the VersionAliasesContextKey field.
+func (c Configuration) GetVersionAliasesContextKey() string {
+	return c.VersionAliasesContextKey
+}
+
 // GetViewEngineContextKey returns the ViewEngineContextKey field.
 func (c Configuration) GetViewEngineContextKey() string {
 	return c.ViewEngineContextKey
@ -1132,6 +1142,10 @@ func WithConfiguration(c Configuration) Configurator {
 			main.VersionContextKey = v
 		}

+		if v := c.VersionAliasesContextKey; v != "" {
+			main.VersionAliasesContextKey = v
+		}
+
 		if v := c.ViewEngineContextKey; v != "" {
 			main.ViewEngineContextKey = v
 		}
@ -1205,16 +1219,17 @@ func DefaultConfiguration() Configuration {
 		// The request body the size limit
 		// can be set by the middleware `LimitRequestBodySize`
 		// or `context#SetMaxRequestBodySize`.
-		PostMaxMemory:           32 << 20, // 32MB
-		LocaleContextKey:        "iris.locale",
-		LanguageContextKey:      "iris.locale.language",
-		LanguageInputContextKey: "iris.locale.language.input",
-		VersionContextKey:       "iris.api.version",
-		ViewEngineContextKey:    "iris.view.engine",
-		ViewLayoutContextKey:    "iris.view.layout",
-		ViewDataContextKey:      "iris.view.data",
-		RemoteAddrHeaders:       nil,
-		RemoteAddrHeadersForce:  false,
+		PostMaxMemory:            32 << 20, // 32MB
+		LocaleContextKey:         "iris.locale",
+		LanguageContextKey:       "iris.locale.language",
+		LanguageInputContextKey:  "iris.locale.language.input",
+		VersionContextKey:        "iris.api.version",
+		VersionAliasesContextKey: "iris.api.version.aliases",
+		ViewEngineContextKey:     "iris.view.engine",
+		ViewLayoutContextKey:     "iris.view.layout",
+		ViewDataContextKey:       "iris.view.data",
+		RemoteAddrHeaders:        nil,
+		RemoteAddrHeadersForce:   false,
 		RemoteAddrPrivateSubnets: []netutil.IPRange{
 			{
 				Start: "10.0.0.0",
--- a/context/configuration.go
+++ b/context/configuration.go
@ -53,6 +53,8 @@ type ConfigurationReadOnly interface {
 	GetLanguageInputContextKey() string
 	// GetVersionContextKey returns the VersionContextKey field.
 	GetVersionContextKey() string
+	// GetVersionAliasesContextKey returns the VersionAliasesContextKey field.
+	GetVersionAliasesContextKey() string

 	// GetViewEngineContextKey returns the ViewEngineContextKey field.
 	GetViewEngineContextKey() string
--- a/context/context.go
+++ b/context/context.go
@ -1974,6 +1974,13 @@ func (ctx *Context) UploadFormFiles(destDirectory string, before ...func(*Contex
 			for _, files := range fhs {
 			innerLoop:
 				for _, file := range files {
+					// Fix an issue that net/http has,
+					// an attacker can push a filename
+					// which could lead to override existing system files
+					// by ../../$file.
+					// Reported by Frank through security reports.
+					file.Filename = strings.TrimLeft(file.Filename, "../")
+					file.Filename = strings.TrimLeft(file.Filename, "..\\")

 					for _, b := range before {
 						if !b(ctx, file) {
--- a/context/context_user.go
+++ b/context/context_user.go
@ -81,15 +81,15 @@ to the end-developer's custom implementations.

 // SimpleUser is a simple implementation of the User interface.
 type SimpleUser struct {
-	Authorization string          `json:"authorization,omitempty"`
-	AuthorizedAt  time.Time       `json:"authorized_at,omitempty"`
-	ID            string          `json:"id,omitempty"`
-	Username      string          `json:"username,omitempty"`
-	Password      string          `json:"password,omitempty"`
-	Email         string          `json:"email,omitempty"`
-	Roles         []string        `json:"roles,omitempty"`
-	Token         json.RawMessage `json:"token,omitempty"`
-	Fields        Map             `json:"fields,omitempty"`
+	Authorization string          `json:"authorization,omitempty" db:"authorization"`
+	AuthorizedAt  time.Time       `json:"authorized_at,omitempty" db:"authorized_at"`
+	ID            string          `json:"id,omitempty" db:"id"`
+	Username      string          `json:"username,omitempty" db:"username"`
+	Password      string          `json:"password,omitempty" db:"password"`
+	Email         string          `json:"email,omitempty" db:"email"`
+	Roles         []string        `json:"roles,omitempty" db:"roles"`
+	Token         json.RawMessage `json:"token,omitempty" db:"token"`
+	Fields        Map             `json:"fields,omitempty" db:"fields"`
 }

 var _ User = (*SimpleUser)(nil)
--- a/context/handler.go
+++ b/context/handler.go
@ -239,6 +239,10 @@ var ignoreMainHandlerNames = [...]string{
 	"iris.reCAPTCHA",
 	"iris.profiling",
 	"iris.recover",
+	"iris.accesslog",
+	"iris.grpc",
+	"iris.requestid",
+	"iris.rewrite",
 }

 // ingoreMainHandlerName reports whether a main handler of "name" should
--- a/context/route.go
+++ b/context/route.go
@ -62,6 +62,10 @@ type RouteReadOnly interface {
 	// MainHandlerIndex returns the first registered handler's index for the route.
 	MainHandlerIndex() int

+	// Property returns a specific property based on its "key"
+	// of this route's Party owner.
+	Property(key string) (interface{}, bool)
+
 	// Sitemap properties: https://www.sitemaps.org/protocol.html

 	// GetLastMod returns the date of last modification of the file served by this route.
--- a/core/router/api_builder.go
+++ b/core/router/api_builder.go
@ -164,7 +164,7 @@ func overlapRoute(r *Route, next *Route) {
 				// Version was not found:
 				//	 we need to be able to send the status on the last not found version
 				//   but reset the status code if a next available matched version was found.
-				//	 see: versioning.Handler.
+				//	 see the versioning package.
 				if !errors.Is(ctx.GetErr(), context.ErrNotFound) {
 					ctx.StatusCode(prevStatusCode)
 				}
@ -196,6 +196,11 @@ type APIBuilder struct {

 	// the api builder global macros registry
 	macros *macro.Macros
+	// the per-party (and its children) values map
+	// that may help on building the API
+	// when source code is splitted between projects.
+	// Initialized on Properties method.
+	properties context.Map
 	// the api builder global routes repository
 	routes *repository
 	// disables the debug logging of routes under a per-party and its children.
@ -624,7 +629,7 @@ func (api *APIBuilder) createRoutes(errorCode int, methods []string, relativePat
 	routes := make([]*Route, len(methods))

 	for i, m := range methods { // single, empty method for error handlers.
-		route, err := NewRoute(errorCode, m, subdomain, path, routeHandlers, *api.macros)
+		route, err := NewRoute(api, errorCode, m, subdomain, path, routeHandlers, *api.macros)
 		if err != nil { // template path parser errors:
 			api.logger.Errorf("[%s:%d] %v -> %s:%s:%s", filename, line, err, m, subdomain, path)
 			continue
@ -668,19 +673,21 @@ func removeDuplicates(elements []string) (result []string) {

 // Party returns a new child Party which inherites its
 // parent's options and middlewares.
-// If "relativePath" matches the parent's one then it returns the current Party.
 // A Party groups routes which may have the same prefix or subdomain and share same middlewares.
 //
 // To create a group of routes for subdomains
 // use the `Subdomain` or `WildcardSubdomain` methods
-// or pass a "relativePath" as "admin." or "*." respectfully.
+// or pass a "relativePath" of "admin." or "*." respectfully.
 func (api *APIBuilder) Party(relativePath string, handlers ...context.Handler) Party {
 	// if app.Party("/"), root party or app.Party("/user") == app.Party("/user")
 	// then just add the middlewares and return itself.
-	if relativePath == "" || api.relativePath == relativePath {
-		api.Use(handlers...)
-		return api
-	}
+	// if relativePath == "" || api.relativePath == relativePath {
+	// 	api.Use(handlers...)
+	// 	return api
+	// }
+	// ^ No, this is wrong, let the developer do its job, if she/he wants a copy let have it,
+	// it's a pure check as well, a path can be the same even if it's the same as its parent, i.e.
+	// app.Party("/user").Party("/user") should result in a /user/user, not a /user.

 	parentPath := api.relativePath
 	dot := string(SubdomainPrefix[0])
@ -712,10 +719,17 @@ func (api *APIBuilder) Party(relativePath string, handlers ...context.Handler) P
 	allowMethods := make([]string, len(api.allowMethods))
 	copy(allowMethods, api.allowMethods)

+	// make a copy of the parent properties.
+	var properties context.Map
+	for k, v := range api.properties {
+		properties[k] = v
+	}
+
 	childAPI := &APIBuilder{
 		// global/api builder
 		logger:              api.logger,
 		macros:              api.macros,
+		properties:          properties,
 		routes:              api.routes,
 		routesNoLog:         api.routesNoLog,
 		beginGlobalHandlers: api.beginGlobalHandlers,
@ -808,6 +822,16 @@ func (api *APIBuilder) Macros() *macro.Macros {
 	return api.macros
 }

+// Properties returns the original Party's properties map,
+// it can be modified before server startup but not afterwards.
+func (api *APIBuilder) Properties() context.Map {
+	if api.properties == nil {
+		api.properties = make(context.Map)
+	}
+
+	return api.properties
+}
+
 // GetRoutes returns the routes information,
 // some of them can be changed at runtime some others not.
 //
@ -1096,6 +1120,8 @@ func (api *APIBuilder) DoneGlobal(handlers ...context.Handler) {

 // RemoveHandler deletes a handler from begin and done handlers
 // based on its name or the handler pc function.
+// Note that UseGlobal and DoneGlobal handlers cannot be removed
+// through this method as they were registered to the routes already.
 //
 // As an exception, if one of the arguments is a pointer to an int,
 // then this is used to set the total amount of removed handlers.
--- a/core/router/party.go
+++ b/core/router/party.go
@ -39,6 +39,10 @@ type Party interface {
 	// Learn more at:  https://github.com/kataras/iris/tree/master/_examples/routing/dynamic-path
 	Macros() *macro.Macros

+	// Properties returns the original Party's properties map,
+	// it can be modified before server startup but not afterwards.
+	Properties() context.Map
+
 	// SetRoutesNoLog disables (true) the verbose logging for the next registered
 	// routes under this Party and its children.
 	//
--- a/core/router/route.go
+++ b/core/router/route.go
@ -19,6 +19,8 @@ import (
 // If any of the following fields are changed then the
 // caller should Refresh the router.
 type Route struct {
+	// The Party which this Route was created and registered on.
+	Party       Party
 	Title       string         `json:"title"`       // custom name to replace the method on debug logging.
 	Name        string         `json:"name"`        // "userRoute"
 	Description string         `json:"description"` // "lists a user"
@ -86,7 +88,7 @@ type Route struct {
 // handlers and the macro container which all routes should share.
 // It parses the path based on the "macros",
 // handlers are being changed to validate the macros at serve time, if needed.
-func NewRoute(statusErrorCode int, method, subdomain, unparsedPath string,
+func NewRoute(p Party, statusErrorCode int, method, subdomain, unparsedPath string,
 	handlers context.Handlers, macros macro.Macros) (*Route, error) {
 	tmpl, err := macro.Parse(unparsedPath, macros)
 	if err != nil {
@ -110,6 +112,7 @@ func NewRoute(statusErrorCode int, method, subdomain, unparsedPath string,
 	formattedPath := formatPath(path)

 	route := &Route{
+		Party:         p,
 		StatusCode:    statusErrorCode,
 		Name:          defaultName,
 		Method:        method,
@ -583,6 +586,8 @@ type routeReadOnlyWrapper struct {
 	*Route
 }

+var _ context.RouteReadOnly = routeReadOnlyWrapper{}
+
 func (rd routeReadOnlyWrapper) StatusErrorCode() int {
 	return rd.Route.StatusCode
 }
@ -619,6 +624,17 @@ func (rd routeReadOnlyWrapper) MainHandlerIndex() int {
 	return rd.Route.MainHandlerIndex
 }

+func (rd routeReadOnlyWrapper) Property(key string) (interface{}, bool) {
+	properties := rd.Route.Party.Properties()
+	if properties != nil {
+		if property, ok := properties[key]; ok {
+			return property, true
+		}
+	}
+
+	return nil, false
+}
+
 func (rd routeReadOnlyWrapper) GetLastMod() time.Time {
 	return rd.Route.LastMod
 }
--- a/go.mod
+++ b/go.mod
@ -8,20 +8,20 @@ require (
 	github.com/Shopify/goreferrer v0.0.0-20181106222321-ec9c9a553398
 	github.com/andybalholm/brotli v1.0.1
 	github.com/aymerick/raymond v2.0.3-0.20180322193309-b565731e1464+incompatible
+	github.com/blang/semver/v4 v4.0.0
 	github.com/dgraph-io/badger/v2 v2.2007.2
 	github.com/eknkc/amber v0.0.0-20171010120322-cdade1c07385
 	github.com/fatih/structs v1.1.0
 	github.com/flosch/pongo2/v4 v4.0.1
 	github.com/go-redis/redis/v8 v8.4.0
 	github.com/google/uuid v1.1.2
-	github.com/hashicorp/go-version v1.2.1
 	github.com/iris-contrib/httpexpect/v2 v2.0.5
 	github.com/iris-contrib/jade v1.1.4
 	github.com/iris-contrib/schema v0.0.6
 	github.com/json-iterator/go v1.1.10
 	github.com/kataras/blocks v0.0.4
 	github.com/kataras/golog v0.1.6
-	github.com/kataras/jwt v0.0.8
+	github.com/kataras/jwt v0.0.9
 	github.com/kataras/neffos v0.0.18
 	github.com/kataras/pio v0.0.10
 	github.com/kataras/sitemap v0.0.5
--- a/hero/reflect.go
+++ b/hero/reflect.go
@ -18,7 +18,7 @@ func valueOf(v interface{}) reflect.Value {

 // indirectType returns the value of a pointer-type "typ".
 // If "typ" is a pointer, array, chan, map or slice it returns its Elem,
-// otherwise returns the typ as it's.
+// otherwise returns the "typ" as it is.
 func indirectType(typ reflect.Type) reflect.Type {
 	switch typ.Kind() {
 	case reflect.Ptr, reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
--- a/middleware/accesslog/accesslog.go
+++ b/middleware/accesslog/accesslog.go
@ -323,6 +323,18 @@ func New(w io.Writer) *AccessLog {
 //
 // It panics on error.
 func File(path string) *AccessLog {
+	f := mustOpenFile(path)
+	return New(bufio.NewReadWriter(bufio.NewReader(f), bufio.NewWriter(f)))
+}
+
+// FileUnbuffered same as File but it does not buffer the data,
+// it flushes the loggers contents as soon as possible.
+func FileUnbuffered(path string) *AccessLog {
+	f := mustOpenFile(path)
+	return New(f)
+}
+
+func mustOpenFile(path string) *os.File {
 	// Note: we add os.RDWR in order to be able to read from it,
 	// some formatters (e.g. CSV) needs that.
 	f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
@ -330,7 +342,7 @@ func File(path string) *AccessLog {
 		panic(err)
 	}

-	return New(bufio.NewReadWriter(bufio.NewReader(f), bufio.NewWriter(f)))
+	return f
 }

 // Broker creates or returns the broker.
--- a/mvc/versioning.go
+++ b/mvc/versioning.go
@ -8,14 +8,14 @@ import (

 // Version returns a valid `Option` that can be passed to the `Application.Handle` method.
 // It requires a specific "version" constraint for a Controller,
-// e.g. ">1, <=2" or just "1".
+// e.g. ">1.0.0 <=2.0.0".
 //
 //
 // Usage:
 // 	m := mvc.New(dataRouter)
-// 	m.Handle(new(v1Controller), mvc.Version("1"), mvc.Deprecated(mvc.DeprecationOptions{}))
-// 	m.Handle(new(v2Controller), mvc.Version("2.3"))
-// 	m.Handle(new(v3Controller), mvc.Version(">=3, <4"))
+// 	m.Handle(new(v1Controller), mvc.Version("1.0.0"), mvc.Deprecated(mvc.DeprecationOptions{}))
+// 	m.Handle(new(v2Controller), mvc.Version("2.3.0"))
+// 	m.Handle(new(v3Controller), mvc.Version(">=3.0.0 <4.0.0"))
 // 	m.Handle(new(noVersionController))
 //
 // See the `versioning` package's documentation for more information on
--- a/sessions/sessiondb/boltdb/database.go
+++ b/sessions/sessiondb/boltdb/database.go
@ -339,14 +339,14 @@ func (db *Database) Visit(sid string, cb func(key string, value interface{})) er
 }

 // Len returns the length of the session's entries (keys).
-func (db *Database) Len(sid string) (n int64) {
+func (db *Database) Len(sid string) (n int) {
 	err := db.Service.View(func(tx *bolt.Tx) error {
 		b := db.getBucketForSession(tx, sid)
 		if b == nil {
 			return nil
 		}

-		n = int64(b.Stats().KeyN)
+		n = int(int64(b.Stats().KeyN))
 		return nil
 	})

--- a/versioning/deprecation.go
+++ b/versioning/deprecation.go
@ -6,10 +6,17 @@ import (
 	"github.com/kataras/iris/v12/context"
 )

+// The response header keys when a resource is deprecated by the server.
+const (
+	APIWarnHeader            = "X-Api-Warn"
+	APIDeprecationDateHeader = "X-Api-Deprecation-Date"
+	APIDeprecationInfoHeader = "X-Api-Deprecation-Info"
+)
+
 // DeprecationOptions describes the deprecation headers key-values.
-// - "X-API-Warn": options.WarnMessage
-// - "X-API-Deprecation-Date": context.FormatTime(ctx, options.DeprecationDate))
-// - "X-API-Deprecation-Info": options.DeprecationInfo
+// - "X-Api-Warn": options.WarnMessage
+// - "X-Api-Deprecation-Date": context.FormatTime(ctx, options.DeprecationDate))
+// - "X-Api-Deprecation-Info": options.DeprecationInfo
 type DeprecationOptions struct {
 	WarnMessage     string
 	DeprecationDate time.Time
@ -37,14 +44,14 @@ func WriteDeprecated(ctx *context.Context, options DeprecationOptions) {
 		options.WarnMessage = DefaultDeprecationOptions.WarnMessage
 	}

-	ctx.Header("X-API-Warn", options.WarnMessage)
+	ctx.Header(APIWarnHeader, options.WarnMessage)

 	if !options.DeprecationDate.IsZero() {
-		ctx.Header("X-API-Deprecation-Date", context.FormatTime(ctx, options.DeprecationDate))
+		ctx.Header(APIDeprecationDateHeader, context.FormatTime(ctx, options.DeprecationDate))
 	}

 	if options.DeprecationInfo != "" {
-		ctx.Header("X-API-Deprecation-Info", options.DeprecationInfo)
+		ctx.Header(APIDeprecationInfoHeader, options.DeprecationInfo)
 	}
 }

--- a/versioning/group.go
+++ b/versioning/group.go
@ -1,39 +1,107 @@
 package versioning

 import (
+	"strings"
+
 	"github.com/kataras/iris/v12/context"
 	"github.com/kataras/iris/v12/core/router"
+
+	"github.com/blang/semver/v4"
 )

-// Group is a group of version-based routes.
-// One version per one or more routes.
-type Group struct {
-	router.Party
+// API is a type alias of router.Party.
+// This is required in order for a Group instance
+// to implement the Party interface without field conflict.
+type API = router.Party

-	// Information not currently in-use.
-	version     string
+// Group represents a group of resources that should
+// be handled based on a version requested by the client.
+// See `NewGroup` for more.
+type Group struct {
+	API
+
+	validate    semver.Range
 	deprecation DeprecationOptions
 }

-// NewGroup returns a ptr to Group based on the given "version".
-// It sets the API Version for the "r" Party.
+// NewGroup returns a version Group based on the given "version" constraint.
+// Group completes the Party interface.
+// The returned Group wraps a cloned Party of the given "r" Party therefore,
+// any changes to its parent won't affect this one (e.g. register global middlewares afterwards).
 //
-// See `Handle` for more.
+// A version is extracted through the versioning.GetVersion function:
+//  Accept-Version: 1.0.0
+//  Accept: application/json; version=1.0.0
+// You can customize it by setting a version based on the request context:
+//  api.Use(func(ctx *context.Context) {
+// 	 if version := ctx.URLParam("version"); version != "" {
+// 	  SetVersion(ctx, version)
+// 	 }
 //
-// Example: _examples/routing/versioning
+//   ctx.Next()
+//  })
+// OR:
+//  api.Use(versioning.FromQuery("version", ""))
+//
+// Examples at: _examples/routing/versioning
 // Usage:
-//  api := versioning.NewGroup(Parent_Party, ">= 1, < 2")
-//  api.Get/Post/Put/Delete...
-func NewGroup(r router.Party, version string) *Group {
+//  app := iris.New()
+//  api := app.Party("/api")
+//  v1 := versioning.NewGroup(api, ">=1.0.0 <2.0.0")
+//  v1.Get/Post/Put/Delete...
+//
+// Valid ranges are:
+//   - "<1.0.0"
+//   - "<=1.0.0"
+//   - ">1.0.0"
+//   - ">=1.0.0"
+//   - "1.0.0", "=1.0.0", "==1.0.0"
+//   - "!1.0.0", "!=1.0.0"
+//
+// A Range can consist of multiple ranges separated by space:
+// Ranges can be linked by logical AND:
+//   - ">1.0.0 <2.0.0" would match between both ranges, so "1.1.1" and "1.8.7"
+// but not "1.0.0" or "2.0.0"
+//   - ">1.0.0 <3.0.0 !2.0.3-beta.2" would match every version between 1.0.0 and 3.0.0
+// except 2.0.3-beta.2
+//
+// Ranges can also be linked by logical OR:
+//   - "<2.0.0 || >=3.0.0" would match "1.x.x" and "3.x.x" but not "2.x.x"
+//
+// AND has a higher precedence than OR. It's not possible to use brackets.
+//
+// Ranges can be combined by both AND and OR
+//
+//  - `>1.0.0 <2.0.0 || >3.0.0 !4.2.1` would match `1.2.3`, `1.9.9`, `3.1.1`,
+// but not `4.2.1`, `2.1.1`
+func NewGroup(r API, version string) *Group {
+	version = strings.ReplaceAll(version, ",", " ")
+	version = strings.TrimSpace(version)
+
+	verRange, err := semver.ParseRange(version)
+	if err != nil {
+		r.Logger().Errorf("versioning: %s: %s", r.GetRelPath(), strings.ToLower(err.Error()))
+		return &Group{API: r}
+	}
+
+	// Clone this one.
+	r = r.Party("/")
+
 	// Note that this feature alters the RouteRegisterRule to RouteOverlap
 	// the RouteOverlap rule does not contain any performance downside
 	// but it's good to know that if you registered other mode, this wanna change it.
 	r.SetRegisterRule(router.RouteOverlap)
-	r.UseOnce(Handler(version)) // this is required in order to not populate this middleware to the next group.
+
+	handler := makeHandler(verRange)
+	// This is required in order to not populate this middleware to the next group.
+	r.UseOnce(handler)
+	// This is required for versioned custom error handlers,
+	// of course if the parent registered one then this will do nothing.
+	r.UseError(handler)

 	return &Group{
-		Party:   r,
-		version: version,
+		API:      r,
+		validate: verRange,
 	}
 }

@ -43,9 +111,27 @@ func (g *Group) Deprecated(options DeprecationOptions) *Group {
 	// store it for future use, e.g. collect all deprecated APIs and notify the developer.
 	g.deprecation = options

-	g.Party.UseOnce(func(ctx *context.Context) {
+	g.API.UseOnce(func(ctx *context.Context) {
 		WriteDeprecated(ctx, options)
 		ctx.Next()
 	})
 	return g
 }
+
+func makeHandler(validate semver.Range) context.Handler {
+	return func(ctx *context.Context) {
+		if !matchVersionRange(ctx, validate) {
+			// The overlapped handler has an exception
+			// of a type of context.NotFound (which versioning.ErrNotFound wraps)
+			// to clear the status code
+			// and the error to ignore this
+			// when available match version exists (see `NewGroup`).
+			if h := NotFoundHandler; h != nil {
+				h(ctx)
+				return
+			}
+		}
+
+		ctx.Next()
+	}
+}
--- a/versioning/group_test.go
+++ b/versioning/group_test.go
@ -0,0 +1,56 @@
+package versioning_test
+
+import (
+	"testing"
+
+	"github.com/kataras/iris/v12"
+	"github.com/kataras/iris/v12/httptest"
+	"github.com/kataras/iris/v12/versioning"
+)
+
+const (
+	v10Response = "v1.0 handler"
+	v2Response  = "v2.x handler"
+)
+
+func sendHandler(contents string) iris.Handler {
+	return func(ctx iris.Context) {
+		ctx.WriteString(contents)
+	}
+}
+
+func TestNewGroup(t *testing.T) {
+	app := iris.New()
+
+	userAPI := app.Party("/api/user")
+	// [... static serving, middlewares and etc goes here].
+
+	userAPIV10 := versioning.NewGroup(userAPI, "1.0.0").Deprecated(versioning.DefaultDeprecationOptions)
+
+	userAPIV10.Get("/", sendHandler(v10Response))
+	userAPIV2 := versioning.NewGroup(userAPI, ">= 2.0.0 < 3.0.0")
+
+	userAPIV2.Get("/", sendHandler(v2Response))
+	userAPIV2.Post("/", sendHandler(v2Response))
+	userAPIV2.Put("/other", sendHandler(v2Response))
+
+	e := httptest.New(t, app)
+
+	ex := e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "1.0.0").Expect()
+	ex.Status(iris.StatusOK).Body().Equal(v10Response)
+	ex.Header("X-API-Warn").Equal(versioning.DefaultDeprecationOptions.WarnMessage)
+
+	e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "2.0.0").Expect().
+		Status(iris.StatusOK).Body().Equal(v2Response)
+	e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "2.1.0").Expect().
+		Status(iris.StatusOK).Body().Equal(v2Response)
+	e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "2.9.9").Expect().
+		Status(iris.StatusOK).Body().Equal(v2Response)
+	e.POST("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "2.0.0").Expect().
+		Status(iris.StatusOK).Body().Equal(v2Response)
+	e.PUT("/api/user/other").WithHeader(versioning.AcceptVersionHeaderKey, "2.9.0").Expect().
+		Status(iris.StatusOK).Body().Equal(v2Response)
+
+	e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "3.0").Expect().
+		Status(iris.StatusNotImplemented).Body().Equal("version not found")
+}
--- a/versioning/version.go
+++ b/versioning/version.go
@ -5,31 +5,31 @@ import (
 	"strings"

 	"github.com/kataras/iris/v12/context"
+
+	"github.com/blang/semver/v4"
 )

 const (
+	// APIVersionResponseHeader the response header which its value contains
+	// the normalized semver matched version.
+	APIVersionResponseHeader = "X-Api-Version"
 	// AcceptVersionHeaderKey is the header key of "Accept-Version".
 	AcceptVersionHeaderKey = "Accept-Version"
 	// AcceptHeaderKey is the header key of "Accept".
 	AcceptHeaderKey = "Accept"
 	// AcceptHeaderVersionValue is the Accept's header value search term the requested version.
 	AcceptHeaderVersionValue = "version"
-
-	// Key is the context key of the version, can be used to manually modify the "requested" version.
-	// Example of how you can change the default behavior to extract a requested version (which is by headers)
-	// from a "version" url parameter instead:
-	// func(ctx iris.Context) { // &version=1
-	// 	ctx.Values().Set(versioning.Key, ctx.URLParamDefault("version", "1"))
-	// 	ctx.Next()
-	// }
-	//
-	// DEPRECATED: Use:
-	// version := ctx.URLParamDefault("version", "1")
-	// versioning.SetVersion(ctx, version) instead.
-	Key = "iris.api.version"
 	// NotFound is the key that can be used inside a `Map` or inside `ctx.SetVersion(versioning.NotFound)`
-	// to tell that a version wasn't found, therefore the not found handler should handle the request instead.
+	// to tell that a version wasn't found, therefore the `NotFoundHandler` should handle the request instead.
 	NotFound = "iris.api.version.notfound"
+	// Empty is just an empty string. Can be used as a key for a version alias
+	// when the requested version of a resource was not even specified by the client.
+	// The difference between NotFound and Empty is important when version aliases are registered:
+	// - A NotFound cannot be registered as version alias, it
+	//   means that the client sent a version with its request
+	//   but that version was not implemented by the server.
+	// - An Empty indicates that the client didn't send any version at all.
+	Empty = ""
 )

 // ErrNotFound reports whether a requested version
@ -54,11 +54,89 @@ var NotFoundHandler = func(ctx *context.Context) {
 	ctx.StopWithPlainError(501, ErrNotFound)
 }

+// FromQuery is a simple helper which tries to
+// set the version constraint from a given URL Query Parameter.
+// The X-Api-Version is still valid.
+func FromQuery(urlQueryParameterName string, defaultVersion string) context.Handler {
+	return func(ctx *context.Context) {
+		version := ctx.URLParam(urlQueryParameterName)
+		if version == "" {
+			version = defaultVersion
+		}
+
+		if version != "" {
+			SetVersion(ctx, version)
+		}
+
+		ctx.Next()
+	}
+}
+
+// If reports whether the "got" matches the "expected" one.
+// the "expected" can be a constraint like ">=1.0.0 <2.0.0".
+// This function is just a helper, better use the Group instead.
+func If(got string, expected string) bool {
+	v, err := semver.Make(got)
+	if err != nil {
+		return false
+	}
+
+	validate, err := semver.ParseRange(expected)
+	if err != nil {
+		return false
+	}
+
+	return validate(v)
+}
+
+// Match reports whether the request matches the expected version.
+// This function is just a helper, better use the Group instead.
+func Match(ctx *context.Context, expectedVersion string) bool {
+	validate, err := semver.ParseRange(expectedVersion)
+	if err != nil {
+		return false
+	}
+
+	return matchVersionRange(ctx, validate)
+}
+
+func matchVersionRange(ctx *context.Context, validate semver.Range) bool {
+	gotVersion := GetVersion(ctx)
+
+	alias, aliasFound := GetVersionAlias(ctx, gotVersion)
+	if aliasFound {
+		SetVersion(ctx, alias) // set the version so next routes have it already.
+		gotVersion = alias
+	}
+
+	if gotVersion == "" {
+		return false
+	}
+
+	v, err := semver.Make(gotVersion)
+	if err != nil {
+		return false
+	}
+
+	if !validate(v) {
+		return false
+	}
+
+	versionString := v.String()
+
+	if !aliasFound { // don't lose any time to set if already set.
+		SetVersion(ctx, versionString)
+	}
+
+	ctx.Header(APIVersionResponseHeader, versionString)
+	return true
+}
+
 // GetVersion returns the current request version.
 //
 // By default the `GetVersion` will try to read from:
-// - "Accept" header, i.e Accept: "application/json; version=1.0"
-// - "Accept-Version" header, i.e Accept-Version: "1.0"
+// - "Accept" header, i.e Accept: "application/json; version=1.0.0"
+// - "Accept-Version" header, i.e Accept-Version: "1.0.0"
 //
 // However, the end developer can also set a custom version for a handler via a middleware by using the context's store key
 // for versions (see `Key` for further details on that).
@ -107,7 +185,129 @@ func GetVersion(ctx *context.Context) string {

 // SetVersion force-sets the API Version.
 // It can be used inside a middleware.
+// Example of how you can change the default behavior to extract a requested version (which is by headers)
+// from a "version" url parameter instead:
+//  func(ctx iris.Context) { // &version=1
+//   version := ctx.URLParamDefault("version", "1.0.0")
+//   versioning.SetVersion(ctx, version)
+// 	 ctx.Next()
+//  }
 // See `GetVersion` too.
 func SetVersion(ctx *context.Context, constraint string) {
 	ctx.Values().Set(ctx.Application().ConfigurationReadOnly().GetVersionContextKey(), constraint)
 }
+
+// AliasMap is just a type alias of the standard map[string]string.
+// Head over to the `Aliases` function below for more.
+type AliasMap = map[string]string
+
+// Aliases is a middleware which registers version constraint aliases
+// for the children Parties(routers). It's respected by versioning Groups.
+//
+// Example Code:
+//  app := iris.New()
+//
+//  api := app.Party("/api")
+//  api.Use(Aliases(map[string]string{
+//   versioning.Empty: "1.0.0", // when no version was provided by the client.
+//   "beta": "4.0.0",
+//   "stage": "5.0.0-alpha"
+//  }))
+//
+//  v1 := NewGroup(api, ">=1.0.0 < 2.0.0")
+//  v1.Get/Post...
+//
+//  v4 := NewGroup(api, ">=4.0.0 < 5.0.0")
+//  v4.Get/Post...
+//
+//  stage := NewGroup(api, "5.0.0-alpha")
+//  stage.Get/Post...
+func Aliases(aliases AliasMap) context.Handler {
+	cp := make(AliasMap, len(aliases)) // copy the map here so we are safe of later modifications by end-dev.
+	for k, v := range aliases {
+		cp[k] = v
+	}
+
+	return func(ctx *context.Context) {
+		SetVersionAliases(ctx, cp, true)
+		ctx.Next()
+	}
+}
+
+// Handler returns a handler which is only fired
+// when the "version" is matched with the requested one.
+// It is not meant to be used by end-developers
+// (exported for version controller feature).
+// Use `NewGroup` instead.
+func Handler(version string) context.Handler {
+	validate, err := semver.ParseRange(version)
+	if err != nil {
+		return func(ctx *context.Context) {
+			ctx.StopWithError(500, err)
+		}
+	}
+
+	return makeHandler(validate)
+}
+
+// GetVersionAlias returns the version alias of the given "gotVersion"
+// or empty. It Reports whether the alias was found.
+// See `SetVersionAliases`, `Aliases` and `Match` for more.
+func GetVersionAlias(ctx *context.Context, gotVersion string) (string, bool) {
+	key := ctx.Application().ConfigurationReadOnly().GetVersionAliasesContextKey()
+	if key == "" {
+		return "", false
+	}
+
+	v := ctx.Values().Get(key)
+	if v == nil {
+		return "", false
+	}
+
+	aliases, ok := v.(AliasMap)
+	if !ok {
+		return "", false
+	}
+
+	version, ok := aliases[gotVersion]
+	if !ok {
+		return "", false
+	}
+
+	return strings.TrimSpace(version), true
+}
+
+// SetVersionAliases sets a map of version aliases when a requested
+// version of a resource was not implemented by the server.
+// Can be used inside a middleware to the parent Party
+// and always before the child versioning groups (see `Aliases` function).
+//
+// The map's key (string) should be the "got version" (by the client)
+// and the value should be the "version constraint to match" instead.
+// The map's value(string) should be a registered version
+// otherwise it will hit the NotFoundHandler (501, "version not found" by default).
+//
+// The given "aliases" is a type of standard map[string]string and
+// should NOT be modified afterwards.
+//
+// The last "override" input argument indicates whether any
+// existing aliases, registered by previous handlers in the chain,
+// should be overridden or copied to the previous map one.
+func SetVersionAliases(ctx *context.Context, aliases AliasMap, override bool) {
+	key := ctx.Application().ConfigurationReadOnly().GetVersionAliasesContextKey()
+	if key == "" {
+		return
+	}
+
+	v := ctx.Values().Get(key)
+	if v == nil || override {
+		ctx.Values().Set(key, aliases)
+		return
+	}
+
+	if existing, ok := v.(AliasMap); ok {
+		for k, v := range aliases {
+			existing[k] = v
+		}
+	}
+}
--- a/versioning/version_test.go
+++ b/versioning/version_test.go
@ -8,6 +8,15 @@ import (
 	"github.com/kataras/iris/v12/versioning"
 )

+func TestIf(t *testing.T) {
+	if expected, got := true, versioning.If("1.0.0", ">=1.0.0"); expected != got {
+		t.Fatalf("expected %s to be %s", "1.0.0", ">= 1.0.0")
+	}
+	if expected, got := true, versioning.If("1.2.3", "> 1.2.0"); expected != got {
+		t.Fatalf("expected %s to be %s", "1.2.3", "> 1.2.0")
+	}
+}
+
 func TestGetVersion(t *testing.T) {
 	app := iris.New()

@ -23,16 +32,16 @@ func TestGetVersion(t *testing.T) {

 	e := httptest.New(t, app)

-	e.GET("/").WithHeader(versioning.AcceptVersionHeaderKey, "1.0").Expect().
-		Status(iris.StatusOK).Body().Equal("1.0")
-	e.GET("/").WithHeader(versioning.AcceptHeaderKey, "application/vnd.api+json; version=2.1").Expect().
-		Status(iris.StatusOK).Body().Equal("2.1")
-	e.GET("/").WithHeader(versioning.AcceptHeaderKey, "application/vnd.api+json; version=2.1 ;other=dsa").Expect().
-		Status(iris.StatusOK).Body().Equal("2.1")
-	e.GET("/").WithHeader(versioning.AcceptHeaderKey, "version=2.1").Expect().
-		Status(iris.StatusOK).Body().Equal("2.1")
-	e.GET("/").WithHeader(versioning.AcceptHeaderKey, "version=1").Expect().
-		Status(iris.StatusOK).Body().Equal("1")
+	e.GET("/").WithHeader(versioning.AcceptVersionHeaderKey, "1.0.0").Expect().
+		Status(iris.StatusOK).Body().Equal("1.0.0")
+	e.GET("/").WithHeader(versioning.AcceptHeaderKey, "application/vnd.api+json; version=2.1.0").Expect().
+		Status(iris.StatusOK).Body().Equal("2.1.0")
+	e.GET("/").WithHeader(versioning.AcceptHeaderKey, "application/vnd.api+json; version=2.1.0 ;other=dsa").Expect().
+		Status(iris.StatusOK).Body().Equal("2.1.0")
+	e.GET("/").WithHeader(versioning.AcceptHeaderKey, "version=2.1.0").Expect().
+		Status(iris.StatusOK).Body().Equal("2.1.0")
+	e.GET("/").WithHeader(versioning.AcceptHeaderKey, "version=1.0.0").Expect().
+		Status(iris.StatusOK).Body().Equal("1.0.0")

 	// unknown versions.
 	e.GET("/").WithHeader(versioning.AcceptVersionHeaderKey, "").Expect().
@ -46,3 +55,53 @@ func TestGetVersion(t *testing.T) {

 	e.GET("/manual").Expect().Status(iris.StatusOK).Body().Equal("11.0.5")
 }
+
+func TestVersionAliases(t *testing.T) {
+	app := iris.New()
+
+	api := app.Party("/api")
+	api.Use(versioning.Aliases(map[string]string{
+		versioning.Empty: "1.0.0",
+		"stage":          "2.0.0",
+	}))
+
+	writeVesion := func(ctx iris.Context) {
+		ctx.WriteString(versioning.GetVersion(ctx))
+	}
+
+	// A group without registration order.
+	v3 := versioning.NewGroup(api, ">= 3.0.0 < 4.0.0")
+	v3.Get("/", writeVesion)
+
+	v1 := versioning.NewGroup(api, ">= 1.0.0 < 2.0.0")
+	v1.Get("/", writeVesion)
+
+	v2 := versioning.NewGroup(api, ">= 2.0.0 < 3.0.0")
+	v2.Get("/", writeVesion)
+
+	api.Get("/manual", func(ctx iris.Context) {
+		versioning.SetVersion(ctx, "12.0.0")
+		ctx.Next()
+	}, writeVesion)
+
+	e := httptest.New(t, app)
+
+	// Make sure the SetVersion still works.
+	e.GET("/api/manual").Expect().Status(iris.StatusOK).Body().Equal("12.0.0")
+
+	// Test Empty default.
+	e.GET("/api").WithHeader(versioning.AcceptVersionHeaderKey, "").Expect().
+		Status(iris.StatusOK).Body().Equal("1.0.0")
+	// Test NotFound error, aliases are not responsible for that.
+	e.GET("/api").WithHeader(versioning.AcceptVersionHeaderKey, "4.0.0").Expect().
+		Status(iris.StatusNotImplemented).Body().Equal("version not found")
+	// Test "stage" alias.
+	e.GET("/api").WithHeader(versioning.AcceptVersionHeaderKey, "stage").Expect().
+		Status(iris.StatusOK).Body().Equal("2.0.0")
+	// Test version 2.
+	e.GET("/api").WithHeader(versioning.AcceptVersionHeaderKey, "2.0.0").Expect().
+		Status(iris.StatusOK).Body().Equal("2.0.0")
+	// Test version 3 (registered first).
+	e.GET("/api").WithHeader(versioning.AcceptVersionHeaderKey, "3.1.0").Expect().
+		Status(iris.StatusOK).Body().Equal("3.1.0")
+}
--- a/versioning/versioning.go
+++ b/versioning/versioning.go
@ -1,154 +0,0 @@
-package versioning
-
-import (
-	"github.com/kataras/iris/v12/context"
-
-	"github.com/hashicorp/go-version"
-)
-
-// If reports whether the "version" is matching to the "is".
-// the "is" can be a constraint like ">= 1, < 3".
-func If(v string, is string) bool {
-	_, ok := check(v, is)
-	return ok
-}
-
-func check(v string, is string) (string, bool) {
-	ver, err := version.NewVersion(v)
-	if err != nil {
-		return "", false
-	}
-
-	constraints, err := version.NewConstraint(is)
-	if err != nil {
-		return "", false
-	}
-
-	// return the extracted version from request, even if not matched.
-	return ver.String(), constraints.Check(ver)
-}
-
-// Match acts exactly the same as `If` does but instead it accepts
-// a Context, so it can be called by a handler to determinate the requested version.
-//
-// If matched then it sets the "X-API-Version" response header and
-// stores the matched version into Context (see `GetVersion` too).
-func Match(ctx *context.Context, expectedVersion string) bool {
-	versionString, matched := check(GetVersion(ctx), expectedVersion)
-	if !matched {
-		return false
-	}
-
-	SetVersion(ctx, versionString)
-	ctx.Header("X-API-Version", versionString)
-	return true
-}
-
-// Handler returns a handler which stop the execution
-// when the given "version" does not match with the requested one.
-func Handler(version string) context.Handler {
-	return func(ctx *context.Context) {
-		if !Match(ctx, version) {
-			// The overlapped handler has an exception
-			// of a type of context.NotFound (which versioning.ErrNotFound wraps)
-			// to clear the status code
-			// and the error to ignore this
-			// when available match version exists (see `NewGroup`).
-			NotFoundHandler(ctx)
-			return
-		}
-
-		ctx.Next()
-	}
-}
-
-// Map is a map of versions targets to a handlers,
-// a handler per version or constraint, the key can be something like ">1, <=2" or just "1".
-type Map map[string]context.Handler
-
-// NewMatcher creates a single handler which decides what handler
-// should be executed based on the requested version.
-//
-// Use the `NewGroup` if you want to add many routes under a specific version.
-//
-// See `Map` and `NewGroup` too.
-func NewMatcher(versions Map) context.Handler {
-	constraintsHandlers, notFoundHandler := buildConstraints(versions)
-
-	return func(ctx *context.Context) {
-		versionString := GetVersion(ctx)
-		if versionString == "" || versionString == NotFound {
-			notFoundHandler(ctx)
-			return
-		}
-
-		ver, err := version.NewVersion(versionString)
-		if err != nil {
-			notFoundHandler(ctx)
-			return
-		}
-
-		for _, ch := range constraintsHandlers {
-			if ch.constraints.Check(ver) {
-				ctx.Header("X-API-Version", ver.String())
-				ch.handler(ctx)
-				return
-			}
-		}
-
-		// pass the not matched version so the not found handler can have knowedge about it.
-		// SetVersion(ctx, versionString)
-		// or let a manual cal of GetVersion(ctx) do that instead.
-		notFoundHandler(ctx)
-	}
-}
-
-type constraintsHandler struct {
-	constraints version.Constraints
-	handler     context.Handler
-}
-
-func buildConstraints(versionsHandler Map) (constraintsHandlers []*constraintsHandler, notfoundHandler context.Handler) {
-	for v, h := range versionsHandler {
-		if v == NotFound {
-			notfoundHandler = h
-			continue
-		}
-
-		constraints, err := version.NewConstraint(v)
-		if err != nil {
-			panic(err)
-		}
-
-		constraintsHandlers = append(constraintsHandlers, &constraintsHandler{
-			constraints: constraints,
-			handler:     h,
-		})
-	}
-
-	if notfoundHandler == nil {
-		notfoundHandler = NotFoundHandler
-	}
-
-	// no sort, the end-dev should declare
-	// all version constraint, i.e < 4.0 may be catch 1.0 if not something like
-	// >= 3.0, < 4.0.
-	// I can make it ordered but I do NOT like the final API of it:
-	/*
-		app.Get("/api/user", NewMatcher( // accepts an array, ordered, see last elem.
-			V("1.0", vHandler("v1 here")),
-			V("2.0", vHandler("v2 here")),
-			V("< 4.0", vHandler("v3.x here")),
-		))
-		instead we have:
-
-		app.Get("/api/user", NewMatcher(Map{ // accepts a map, unordered, see last elem.
-			"1.0":           Deprecated(vHandler("v1 here")),
-			"2.0":           vHandler("v2 here"),
-			">= 3.0, < 4.0": vHandler("v3.x here"),
-			VersionUnknown: customHandlerForNotMatchingVersion,
-		}))
-	*/
-
-	return
-}
--- a/versioning/versioning_test.go
+++ b/versioning/versioning_test.go
@ -1,135 +0,0 @@
-package versioning_test
-
-import (
-	"testing"
-
-	"github.com/kataras/iris/v12"
-	"github.com/kataras/iris/v12/httptest"
-	"github.com/kataras/iris/v12/versioning"
-)
-
-func notFoundHandler(ctx iris.Context) {
-	ctx.NotFound()
-}
-
-const (
-	v10Response = "v1.0 handler"
-	v2Response  = "v2.x handler"
-)
-
-func sendHandler(contents string) iris.Handler {
-	return func(ctx iris.Context) {
-		ctx.WriteString(contents)
-	}
-}
-
-func TestIf(t *testing.T) {
-	if expected, got := true, versioning.If("1.0", ">=1"); expected != got {
-		t.Fatalf("expected %s to be %s", "1.0", ">= 1")
-	}
-	if expected, got := true, versioning.If("1.2.3", "> 1.2"); expected != got {
-		t.Fatalf("expected %s to be %s", "1.2.3", "> 1.2")
-	}
-}
-
-func TestNewMatcher(t *testing.T) {
-	app := iris.New()
-
-	userAPI := app.Party("/api/user")
-	userAPI.Get("/", versioning.NewMatcher(versioning.Map{
-		"1.0":               sendHandler(v10Response),
-		">= 2, < 3":         sendHandler(v2Response),
-		versioning.NotFound: notFoundHandler,
-	}))
-
-	// middleware as usual.
-	myMiddleware := func(ctx iris.Context) {
-		ctx.Header("X-Custom", "something")
-		ctx.Next()
-	}
-	myVersions := versioning.Map{
-		"1.0": sendHandler(v10Response),
-	}
-
-	userAPI.Get("/with_middleware", myMiddleware, versioning.NewMatcher(myVersions))
-
-	e := httptest.New(t, app)
-
-	e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "1").Expect().
-		Status(iris.StatusOK).Body().Equal(v10Response)
-	e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "2.0").Expect().
-		Status(iris.StatusOK).Body().Equal(v2Response)
-	e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "2.1").Expect().
-		Status(iris.StatusOK).Body().Equal(v2Response)
-	e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "2.9.9").Expect().
-		Status(iris.StatusOK).Body().Equal(v2Response)
-
-	// middleware as usual.
-	ex := e.GET("/api/user/with_middleware").WithHeader(versioning.AcceptVersionHeaderKey, "1.0").Expect()
-	ex.Status(iris.StatusOK).Body().Equal(v10Response)
-	ex.Header("X-Custom").Equal("something")
-
-	e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "3.0").Expect().
-		Status(iris.StatusNotFound).Body().Equal("Not Found")
-}
-
-func TestNewGroup(t *testing.T) {
-	app := iris.New()
-
-	userAPI := app.Party("/api/user")
-	// [... static serving, middlewares and etc goes here].
-
-	userAPIV10 := versioning.NewGroup(userAPI, "1.0").Deprecated(versioning.DefaultDeprecationOptions)
-	// V10middlewareResponse := "m1"
-	// userAPIV10.Use(func(ctx iris.Context) {
-	// 	println("exec userAPIV10.Use - midl1")
-	// 	sendHandler(V10middlewareResponse)(ctx)
-	// 	ctx.Next()
-	// })
-	// userAPIV10.Use(func(ctx iris.Context) {
-	// 	println("exec userAPIV10.Use - midl2")
-	// 	sendHandler(V10middlewareResponse + "midl2")(ctx)
-	// 	ctx.Next()
-	// })
-	// userAPIV10.Use(func(ctx iris.Context) {
-	// 	println("exec userAPIV10.Use - midl3")
-	// 	ctx.Next()
-	// })
-
-	userAPIV10.Get("/", sendHandler(v10Response))
-	userAPIV2 := versioning.NewGroup(userAPI, ">= 2, < 3")
-	// V2middlewareResponse := "m2"
-	// userAPIV2.Use(func(ctx iris.Context) {
-	// 	println("exec userAPIV2.Use - midl1")
-	// 	sendHandler(V2middlewareResponse)(ctx)
-	// 	ctx.Next()
-	// })
-	// userAPIV2.Use(func(ctx iris.Context) {
-	// 	println("exec userAPIV2.Use - midl2")
-	// 	ctx.Next()
-	// })
-
-	userAPIV2.Get("/", sendHandler(v2Response))
-	userAPIV2.Post("/", sendHandler(v2Response))
-	userAPIV2.Put("/other", sendHandler(v2Response))
-
-	e := httptest.New(t, app)
-
-	ex := e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "1").Expect()
-	ex.Status(iris.StatusOK).Body().Equal(v10Response)
-	ex.Header("X-API-Warn").Equal(versioning.DefaultDeprecationOptions.WarnMessage)
-
-	e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "2.0").Expect().
-		Status(iris.StatusOK).Body().Equal(v2Response)
-	e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "2.1").Expect().
-		Status(iris.StatusOK).Body().Equal(v2Response)
-	e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "2.9.9").Expect().
-		Status(iris.StatusOK).Body().Equal(v2Response)
-	e.POST("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "2").Expect().
-		Status(iris.StatusOK).Body().Equal(v2Response)
-	e.PUT("/api/user/other").WithHeader(versioning.AcceptVersionHeaderKey, "2.9").Expect().
-		Status(iris.StatusOK).Body().Equal(v2Response)
-
-	e.GET("/api/user").WithHeader(versioning.AcceptVersionHeaderKey, "3.0").Expect().
-		Status(iris.StatusNotImplemented).Body().Equal("version not found")
-}
				`@ -0,0 +1 @@`
				`<h1>This is the directory for version 1 templates</h1>`
				`@ -0,0 +1 @@`
				`<h1>This is the directory for version 2 templates</h1>`
				`@ -0,0 +1 @@`
				`<h1>This is the directory for version 3 templates</h1>`