update code for go version 1.24

_benchmarks/view/ace/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -21,7 +25,7 @@ func index(ctx iris.Context) {
 
 	ctx.ViewLayout("layouts/main")
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_benchmarks/view/blocks/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -23,7 +27,7 @@ func index(ctx iris.Context) {
 
 	ctx.ViewLayout("main")
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_benchmarks/view/django/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -22,7 +26,7 @@ func index(ctx iris.Context) {
 	// Layouts are only rendered from inside the index page itself
 	// using the "extends" keyword.
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_benchmarks/view/handlebars/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -20,7 +24,7 @@ func index(ctx iris.Context) {
 
 	ctx.ViewLayout("layouts/main")
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_benchmarks/view/html/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -21,7 +25,7 @@ func index(ctx iris.Context) {
 
 	ctx.ViewLayout("layouts/main")
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_benchmarks/view/jet/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -22,7 +26,7 @@ func index(ctx iris.Context) {
 	// Layouts are only rendered from inside the index page itself
 	// using the "extends" keyword.
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_benchmarks/view/pug/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -23,7 +27,7 @@ func index(ctx iris.Context) {
 	// Layouts are only rendered from inside the index page itself
 	// using the "extends" keyword.
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/auth/auth/main.go

@@ -119,7 +119,7 @@ func main() {
 
 func renderSigninForm(ctx iris.Context) {
 	if err := ctx.View("signin", iris.Map{"Title": "Signin Page"}); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/auth/goth/main.go

@@ -21,6 +21,7 @@ package main
 // are fixed in the time I wrote that example, have fun!
 import (
 	"errors"
+	"fmt"
 	"os"
 	"sort"
 
@@ -380,7 +381,7 @@ func main() {
 		if err := ctx.View("user.html", iris.Map{
 			"user": user,
 		}); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})
@@ -399,14 +400,14 @@ func main() {
 		}
 
 		if err := ctx.View("user.html", gothUser); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})
 
 	app.Get("/", func(ctx iris.Context) {
 		if err := ctx.View("index.html", providerIndex); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/auth/hcaptcha/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/kataras/iris/v12"
@@ -43,7 +44,7 @@ func register(ctx iris.Context) {
 func registerForm(ctx iris.Context) {
 	ctx.ViewData("SiteKey", siteKey)
 	if err := ctx.View("register_form.html"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/bootstrapper/bootstrap/bootstrapper.go

@@ -1,6 +1,7 @@
 package bootstrap
 
 import (
+	"fmt"
 	"time"
 
 	"github.com/gorilla/securecookie"
@@ -78,7 +79,7 @@ func (b *Bootstrapper) SetupErrorHandlers() {
 		ctx.ViewData("Err", err)
 		ctx.ViewData("Title", "Error")
 		if err := ctx.View("shared/error.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/bootstrapper/routes/index.go

@@ -1,6 +1,8 @@
 package routes
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 )
 
@@ -8,7 +10,7 @@ import (
 func GetIndexHandler(ctx iris.Context) {
 	ctx.ViewData("Title", "Index Page")
 	if err := ctx.View("index.html"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/dropzonejs/README.md

@@ -107,7 +107,7 @@ func main() {
     // GET: http://localhost:8080
     app.Get("/", func(ctx iris.Context) {
         if err := ctx.View("upload.html"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
     })

_examples/dropzonejs/README_PART2.md

@@ -172,7 +172,7 @@ func main() {
 
     app.Get("/", func(ctx iris.Context) {
         if err := ctx.View("upload.html"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
     })

_examples/dropzonejs/src/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"image/jpeg"
 	"image/png"
 	"io"
@@ -125,7 +126,7 @@ func main() {
 
 	app.Get("/", func(ctx iris.Context) {
 		if err := ctx.View("upload.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/file-server/file-server/main.go

@@ -95,7 +95,7 @@ func uploadView(ctx iris.Context) {
 	token := fmt.Sprintf("%x", h.Sum(nil))
 
 	if err := ctx.View("upload.html", token); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/file-server/single-page-application/embedded-single-page-application/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 )
 
@@ -27,7 +29,7 @@ func newApp() *iris.Application {
 	app.Get("/", func(ctx iris.Context) {
 		ctx.ViewData("Page", page)
 		if err := ctx.View("index.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/file-server/spa-vue-router/main.go

@@ -28,7 +28,7 @@ func fullVueRouter() {
 
 func index(ctx iris.Context) {
 	if err := ctx.View("index.html"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/file-server/upload-file/main.go

@@ -32,7 +32,7 @@ func main() {
 		// or add second argument to the `View` method.
 		// Token will be passed as {{.}} in the template.
 		if err := ctx.View("upload_form.html", token); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/file-server/upload-files/main.go

@@ -33,7 +33,7 @@ func newApp() *iris.Application {
 
 		// render the form with the token for any use you'd like.
 		if err := ctx.View("upload_form.html", token); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/i18n/basic/main.go

@@ -87,7 +87,7 @@ func newApp() *iris.Application {
 				return template.HTML(ctx.Tr(message, args...))
 			},
 		}); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 

_examples/logging/request-logger/accesslog-broker/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/kataras/iris/v12"
@@ -62,7 +63,7 @@ func notFoundHandler(ctx iris.Context) {
 
 	ctx.HTML("Did you mean?<ul>")
 	for _, s := range suggestPaths {
-		ctx.HTML(`<li><a href="%s">%s</a></li>`, s, s)
+		ctx.HTML(fmt.Sprintf(`<li><a href="%s">%s</a></li>`, s, s))
 	}
 	ctx.HTML("</ul>")
 }
@@ -73,7 +74,7 @@ func indexHandler(ctx iris.Context) {
 
 func profileHandler(ctx iris.Context) {
 	username := ctx.Params().Get("username")
-	ctx.HTML("Hello, <strong>%s</strong>!", username)
+	ctx.HTML(fmt.Sprintf("Hello, <strong>%s</strong>!", username))
 }
 
 func readBodyHandler(ctx iris.Context) {

_examples/mvc/login/main.go

@@ -3,6 +3,7 @@
 package main
 
 import (
+	"fmt"
 	"time"
 
 	"github.com/kataras/iris/v12/_examples/mvc/login/datasource"
@@ -34,7 +35,7 @@ func main() {
 		ctx.ViewData("Message", ctx.Values().
 			GetStringDefault("message", "The page you're looking for doesn't exist"))
 		if err := ctx.View("shared/error.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/mvc/websocket-auth/main.go

@@ -52,7 +52,7 @@ func newApp() *iris.Application {
 
 func renderSigninForm(ctx iris.Context) {
 	if err := ctx.View("signin", iris.Map{"Title": "Signin Page"}); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/request-body/read-form/checkboxes/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -14,7 +18,7 @@ func main() {
 
 func showForm(ctx iris.Context) {
 	if err := ctx.View("form.html"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/request-body/read-form/main.go

@@ -2,6 +2,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 )
 
@@ -19,7 +21,7 @@ func main() {
 
 	app.Get("/", func(ctx iris.Context) {
 		if err := ctx.View("form.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/response-writer/http2push/main.go

@@ -5,6 +5,7 @@
 package main
 
 import (
+	"fmt"
 	"net/http"
 
 	"github.com/kataras/iris/v12"
@@ -39,7 +40,7 @@ func pushHandler(ctx iris.Context) {
 		}
 	}
 
-	ctx.HTML(`<html><body><script src="%s"></script></body></html>`, target)
+	ctx.HTML(fmt.Sprintf(`<html><body><script src="%s"></script></body></html>`, target))
 }
 
 func simpleAssetHandler(ctx iris.Context) {

_examples/routing/custom-context/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"sync"
 
 	"github.com/kataras/iris/v12"
@@ -82,5 +83,5 @@ func (c *myCustomContext) SetContext(ctx iris.Context) {
 func (c *myCustomContext) HTML(format string, args ...interface{}) (int, error) {
 	c.Application().Logger().Info("HTML was called from custom Context")
 
-	return c.Context.HTML(format, args...)
+	return c.Context.HTML(fmt.Sprintf(format, args...))
 }

_examples/routing/http-wire-errors/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 	// IMPORTANT, import this sub-package.
 	// Note tht it does NOT break compatibility with the
@@ -49,7 +51,7 @@ func main() {
 }
 
 func fireCustomErrorCodeName(ctx iris.Context) {
-	Custom.Details(ctx, "message", "details with arguments: %s", "an argument")
+	Custom.Details(ctx, "message", fmt.Sprintf("details with arguments: %s", "an argument"))
 }
 
 func fireInvalidArgument(ctx iris.Context) {

_examples/routing/intelligence/manual/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -27,7 +31,7 @@ func notFound(ctx iris.Context) {
 
 	ctx.HTML("Did you mean?<ul>")
 	for _, s := range suggestPaths {
-		ctx.HTML(`<li><a href="%s">%s</a></li>`, s, s)
+		ctx.HTML(fmt.Sprintf(`<li><a href="%s">%s</a></li>`, s, s))
 	}
 	ctx.HTML("</ul>")
 }

_examples/routing/main.go

@@ -111,7 +111,7 @@ func newApp() *iris.Application {
 		// if is larger then send a bad request status
 		if err != nil {
 			ctx.StatusCode(iris.StatusBadRequest)
-			ctx.Writef(err.Error())
+			ctx.WriteString(err.Error())
 			return
 		}
 		// send back the post body

_examples/routing/overview-2/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 )
 
@@ -77,7 +79,7 @@ func main() {
 	app.Get("/", func(ctx iris.Context) {
 		ctx.HTML("<html><head></head><body><ul>")
 		for _, link := range []string{"/encode", "/profile/username", "/users/42"} {
-			ctx.HTML(`<li><a href="%s">%s</a></li>`, link, link)
+			ctx.HTML(fmt.Sprintf(`<li><a href="%s">%s</a></li>`, link, link))
 		}
 		ctx.HTML("</ul></body></html>")
 	})
@@ -101,7 +103,7 @@ func profileByUsername(ctx iris.Context) {
 	// renders "./views/user/profile.html"
 	// with {{ .Username }} equals to the username dynamic path parameter.
 	if err := ctx.View("user/profile.html"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }
@@ -126,7 +128,7 @@ func createUser(ctx iris.Context) {
 	// with {{ . }} equals to the User object, i.e {{ .Username }} , {{ .Firstname}} etc...
 	ctx.ViewData("", user)
 	if err := ctx.View("user/create_verification.html"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/routing/overview/main.go

@@ -123,7 +123,7 @@ func main() {
 
 	app.Delete("/something", func(ctx iris.Context) {
 		name := ctx.URLParam("name")
-		ctx.Writef(name)
+		ctx.WriteString(name)
 	})
 
 	app.None("/secret", privateHandler)

_examples/routing/subdomains/http-errors-view/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	newApp().Listen("mydomain.com:80", iris.WithLogLevel("debug"))
@@ -31,7 +35,7 @@ func handleNotFoundTestSubdomain(ctx iris.Context) {
 	if err := ctx.View("error.html", iris.Map{
 		"ErrorCode": ctx.GetStatusCode(),
 	}); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/routing/versioning/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 	"github.com/kataras/iris/v12/versioning"
 )
@@ -99,7 +101,7 @@ func testError(v string) iris.Handler {
 
 func testView(ctx iris.Context) {
 	if err := ctx.View("index.html"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/sessions/overview/example/example.go

@@ -2,6 +2,7 @@ package example
 
 import (
 	"errors"
+	"fmt"
 
 	"github.com/kataras/iris/v12"
 	"github.com/kataras/iris/v12/sessions"
@@ -27,7 +28,7 @@ func NewApp(sess *sessions.Sessions) *iris.Application {
 
 		ctx.HTML("<ul>")
 		session.Visit(func(key string, value interface{}) {
-			ctx.HTML("<li> %s = %v </li>", key, value)
+			ctx.HTML(fmt.Sprintf("<li> %s = %v </li>", key, value))
 		})
 
 		ctx.HTML("</ul>")

_examples/sessions/viewdata/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 	"github.com/kataras/iris/v12/sessions"
 )
@@ -30,7 +32,7 @@ func index(ctx iris.Context) {
 	session := sessions.Get(ctx)
 	session.Set("username", "kataras")
 	if err := ctx.View("index"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 	/* OR without middleware:

_examples/url-shortener/main.go

@@ -10,6 +10,7 @@
 package main
 
 import (
+	"fmt"
 	"html/template"
 
 	"github.com/kataras/iris/v12"
@@ -51,7 +52,7 @@ func newApp(db *DB) *iris.Application {
 	indexHandler := func(ctx iris.Context) {
 		ctx.ViewData("URL_COUNT", db.Len())
 		if err := ctx.View("index.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	}

_examples/view/context-view-engine/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -38,7 +42,7 @@ func index(ctx iris.Context) {
 
 	ctx.ViewLayout("main")
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }
@@ -50,7 +54,7 @@ func admin(ctx iris.Context) {
 
 	ctx.ViewLayout("main")
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }
@@ -68,7 +72,7 @@ func onFly(ctx iris.Context) {
 	}
 
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/embedding-templates-into-app-bindata/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -20,7 +24,7 @@ func main() {
 	app.Get("/", func(ctx iris.Context) {
 		if err := ctx.View("page1.html"); err != nil {
 			ctx.StatusCode(iris.StatusInternalServerError)
-			ctx.Writef(err.Error())
+			ctx.WriteString(err.Error())
 		}
 	})
 
@@ -29,7 +33,7 @@ func main() {
 		ctx.ViewLayout(iris.NoLayout)
 		if err := ctx.View("page1.html"); err != nil {
 			ctx.StatusCode(iris.StatusInternalServerError)
-			ctx.Writef(err.Error())
+			ctx.WriteString(err.Error())
 		}
 	})
 
@@ -38,13 +42,13 @@ func main() {
 	{ // both of these will use the layouts/mylayout.html as their layout.
 		my.Get("/", func(ctx iris.Context) {
 			if err := ctx.View("page1.html"); err != nil {
-				ctx.HTML("<h3>%s</h3>", err.Error())
+				ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 				return
 			}
 		})
 		my.Get("/other", func(ctx iris.Context) {
 			if err := ctx.View("page1.html"); err != nil {
-				ctx.HTML("<h3>%s</h3>", err.Error())
+				ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 				return
 			}
 		})

_examples/view/embedding-templates-into-app/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"embed"
+	"fmt"
 
 	"github.com/kataras/iris/v12"
 )
@@ -23,7 +24,7 @@ func main() {
 
 	app.Get("/", func(ctx iris.Context) {
 		if err := ctx.View("page1.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})
@@ -32,7 +33,7 @@ func main() {
 	app.Get("/nolayout", func(ctx iris.Context) {
 		ctx.ViewLayout(iris.NoLayout)
 		if err := ctx.View("page1.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})
@@ -42,13 +43,13 @@ func main() {
 	{ // both of these will use the layouts/mylayout.html as their layout.
 		my.Get("/", func(ctx iris.Context) {
 			if err := ctx.View("page1.html"); err != nil {
-				ctx.HTML("<h3>%s</h3>", err.Error())
+				ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 				return
 			}
 		})
 		my.Get("/other", func(ctx iris.Context) {
 			if err := ctx.View("page1.html"); err != nil {
-				ctx.HTML("<h3>%s</h3>", err.Error())
+				ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 				return
 			}
 		})

_examples/view/fallback/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -39,7 +43,7 @@ func main() {
 
 func index(ctx iris.Context) {
 	if err := ctx.View("blabla.html"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/layout/ace/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -23,7 +27,7 @@ func index(ctx iris.Context) {
 
 	ctx.ViewLayout("layouts/main")
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/layout/blocks/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -24,7 +28,7 @@ func index(ctx iris.Context) {
 
 	ctx.ViewLayout("main")
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/layout/django/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -22,7 +26,7 @@ func index(ctx iris.Context) {
 	// Layouts are only rendered from inside the index page itself
 	// using the "extends" keyword.
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/layout/handlebars/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -21,7 +25,7 @@ func index(ctx iris.Context) {
 
 	ctx.ViewLayout("layouts/main")
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/layout/html/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -21,7 +25,7 @@ func index(ctx iris.Context) {
 
 	ctx.ViewLayout("layouts/main")
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/layout/jet/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -23,7 +27,7 @@ func index(ctx iris.Context) {
 	// Layouts are only rendered from inside the index page itself
 	// using the "extends" keyword.
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/layout/pug/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -22,7 +26,7 @@ func index(ctx iris.Context) {
 	// Layouts are only rendered from inside the index page itself
 	// using the "extends" keyword.
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/overview/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"html/template"
 	"time"
 
@@ -36,7 +37,7 @@ func main() {
 		// render the template with the file name relative to the './templates'.
 		// file extension is OPTIONAL.
 		if err := ctx.View("hi.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})
@@ -51,7 +52,7 @@ func main() {
 		}
 
 		if err := ctx.View("example.html", examplePage); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})
@@ -80,7 +81,7 @@ func main() {
 		}
 
 		if err := ctx.View("example.html", examplePage); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})
@@ -97,7 +98,7 @@ func main() {
 		}
 
 		if err := ctx.View("functions.html", functionsPage); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/view/parse-template/django/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	e := iris.Django(nil, ".html") // You can still use a file system though.
@@ -24,7 +28,7 @@ func index(ctx iris.Context) {
 	if err := ctx.View("program.html", iris.Map{
 		"Name": "Gerasimos",
 	}); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/parse-template/handlebars/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	e := iris.Handlebars(nil, ".html") // You can still use a file system though.
@@ -22,7 +26,7 @@ func index(ctx iris.Context) {
 	if err := ctx.View("program.html", iris.Map{
 		"Name": "Gerasimos",
 	}); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/parse-template/jet/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"reflect"
 
 	"github.com/kataras/iris/v12"
@@ -30,7 +31,7 @@ func index(ctx iris.Context) {
 	if err := ctx.View("program.jet", iris.Map{
 		"Name": "Gerasimos",
 	}); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/parse-template/main.go

@@ -4,7 +4,11 @@
 // template parsers navigate through the example's subdirectories.
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	// To not load any templates from files or embedded data,
@@ -34,7 +38,7 @@ func index(ctx iris.Context) {
 	if err := ctx.View("program.html", iris.Map{
 		"Name": "Gerasimos",
 	}); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/template_ace_0/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -15,7 +19,7 @@ func main() {
 		if err := ctx.View("index", iris.Map{
 			"Title": "Title of The Page",
 		}); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})
@@ -25,7 +29,7 @@ func main() {
 		if err := ctx.View("index", iris.Map{ // file extension is optional.
 			"Title": "Title of the main Page",
 		}); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/view/template_blocks_0/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -20,7 +24,7 @@ func index(ctx iris.Context) {
 
 	ctx.ViewLayout("main")
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }
@@ -35,7 +39,7 @@ func internalServerError(ctx iris.Context) {
 
 	ctx.ViewLayout("error")
 	if err := ctx.View("500", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/template_blocks_1_embedded/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 // $ go install github.com/go-bindata/go-bindata/v3/go-bindata@latest
 //
@@ -29,7 +33,7 @@ func index(ctx iris.Context) {
 
 	ctx.ViewLayout("main")
 	if err := ctx.View("index", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }
@@ -44,7 +48,7 @@ func internalServerError(ctx iris.Context) {
 
 	ctx.ViewLayout("error")
 	if err := ctx.View("500", data); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/template_django_0/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"time"
 
 	"github.com/kataras/iris/v12"
@@ -40,7 +41,7 @@ func hi(ctx iris.Context) {
 		"name":            "iris",
 		"serverStartTime": startTime,
 	}); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/template_django_1/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 func main() {
 	app := iris.New()
@@ -31,7 +35,7 @@ func main() {
 		paramsAsArray := []string{"theParam1", "theParam2", "paramThirdAfterStatic"}
 		ctx.ViewData("ParamsAsArray", paramsAsArray)
 		if err := ctx.View("page.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/view/template_handlebars_0/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 	"github.com/kataras/iris/v12/mvc"
 )
@@ -29,7 +31,7 @@ func main() {
 		}
 
 		if err := ctx.View("example.html", viewData); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/view/template_html_0/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 )
 
@@ -32,7 +34,7 @@ func hi(ctx iris.Context) {
 	ctx.ViewData("Name", "iris") // {{.Name}} will render: iris
 	// ctx.ViewData("", myCcustomStruct{})
 	if err := ctx.View("hi.html"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/template_html_1/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 )
 
@@ -19,7 +21,7 @@ func main() {
 		ctx.CompressWriter(true)
 		ctx.ViewData("", mypage{"My Page title", "Hello world!"})
 		if err := ctx.View("mypage.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 		// Note that: you can pass "layout" : "otherLayout.html" to bypass the config's Layout property

_examples/view/template_html_2/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 )
 
@@ -18,7 +20,7 @@ func main() {
 	app.Get("/", func(ctx iris.Context) {
 		if err := ctx.View("page1.html"); err != nil {
 			ctx.StatusCode(iris.StatusInternalServerError)
-			ctx.Writef(err.Error())
+			ctx.WriteString(err.Error())
 		}
 	})
 
@@ -27,7 +29,7 @@ func main() {
 		ctx.ViewLayout(iris.NoLayout)
 		if err := ctx.View("page1.html"); err != nil {
 			ctx.StatusCode(iris.StatusInternalServerError)
-			ctx.Writef(err.Error())
+			ctx.WriteString(err.Error())
 		}
 	})
 
@@ -36,13 +38,13 @@ func main() {
 	{ // both of these will use the layouts/mylayout.html as their layout.
 		my.Get("/", func(ctx iris.Context) {
 			if err := ctx.View("page1.html"); err != nil {
-				ctx.HTML("<h3>%s</h3>", err.Error())
+				ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 				return
 			}
 		})
 		my.Get("/other", func(ctx iris.Context) {
 			if err := ctx.View("page1.html"); err != nil {
-				ctx.HTML("<h3>%s</h3>", err.Error())
+				ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 				return
 			}
 		})

_examples/view/template_html_3/main.go

@@ -3,6 +3,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 )
 
@@ -35,7 +37,7 @@ func main() {
 		paramsAsArray := []string{"theParam1", "theParam2", "paramThirdAfterStatic"}
 		ctx.ViewData("ParamsAsArray", paramsAsArray)
 		if err := ctx.View("page.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/view/template_html_4/main.go

@@ -2,6 +2,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 	"github.com/kataras/iris/v12/core/router"
 )
@@ -52,7 +54,7 @@ func main() {
 		paramsAsArray := []string{"username5", "theParam1", "theParam2", "paramThirdAfterStatic"}
 		ctx.ViewData("ParamsAsArray", paramsAsArray)
 		if err := ctx.View("page.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/view/template_html_5/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 )
 
@@ -13,7 +15,7 @@ func main() {
 	app.Get("/home", func(ctx iris.Context) {
 		ctx.ViewData("title", "Home page")
 		if err := ctx.View("home.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 
@@ -24,14 +26,14 @@ func main() {
 
 	app.Get("/about", func(ctx iris.Context) {
 		if err := ctx.View("about.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})
 
 	app.Get("/user/index", func(ctx iris.Context) {
 		if err := ctx.View("user/index.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/view/template_jet_0/main.go

@@ -114,7 +114,7 @@ func main() {
 
 		ctx.ViewData("title", "Show TODO")
 		if err := ctx.View("todos/show.jet", todo); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})
@@ -136,7 +136,7 @@ func main() {
 		// and ctx.View("todos/index.jet")
 		// OR
 		if err := ctx.View("todos/index.jet", (&doneTODOs{}).New(todos)); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/view/template_jet_1_embedded/main.go

@@ -5,6 +5,7 @@
 package main
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/kataras/iris/v12"
@@ -23,7 +24,7 @@ func main() {
 
 	app.Get("/", func(ctx iris.Context) {
 		if err := ctx.View("index.jet"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/view/template_jet_2/main.go

@@ -2,6 +2,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 )
 
@@ -34,7 +36,7 @@ func main() {
 		paramsAsArray := []string{"theParam1", "theParam2", "paramThirdAfterStatic"}
 		ctx.ViewData("ParamsAsArray", paramsAsArray)
 		if err := ctx.View("page.jet"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/view/template_jet_3/main.go

@@ -25,7 +25,7 @@ func main() {
 
 	app.Get("/", func(ctx iris.Context) {
 		if err := ctx.View("index.jet"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/view/template_pug_0/main.go

@@ -1,7 +1,11 @@
 // Package main shows an example of pug actions based on https://github.com/Joker/jade/tree/master/example/actions
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 type Person struct {
 	Name   string
@@ -39,7 +43,7 @@ func index(ctx iris.Context) {
 	}
 
 	if err := ctx.View("index.pug", person); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/template_pug_1/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"html/template"
 
 	"github.com/kataras/iris/v12"
@@ -25,7 +26,7 @@ func main() {
 
 func index(ctx iris.Context) {
 	if err := ctx.View("index.pug"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/view/template_pug_2_embedded/main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/kataras/iris/v12"
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12"
+)
 
 // $ go install github.com/go-bindata/go-bindata/v3/go-bindata@latest
 //
@@ -23,7 +27,7 @@ func main() {
 
 func index(ctx iris.Context) {
 	if err := ctx.View("index.pug"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/websocket/gorilla-filewatch/main.go

@@ -12,6 +12,7 @@ package main
 
 import (
 	"flag"
+	"fmt"
 	"log"
 	"os"
 	"strconv"
@@ -147,7 +148,7 @@ func serveHome(ctx iris.Context) {
 		strconv.FormatInt(lastMod.UnixNano(), 16),
 	}
 	if err := ctx.View("home.html", v); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

_examples/websocket/native-messages/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"log"
 
 	"github.com/kataras/iris/v12"
@@ -50,7 +51,7 @@ func main() {
 
 	app.Get("/", func(ctx iris.Context) {
 		if err := ctx.View("client.html", clientPage{"Client Page", "localhost:8080"}); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})

_examples/websocket/online-visitors/main.go

@@ -34,7 +34,7 @@ func main() {
 	h := func(ctx iris.Context) {
 		ctx.ViewData("", page{PageID: "index page"})
 		if err := ctx.View("index.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	}
@@ -42,7 +42,7 @@ func main() {
 	h2 := func(ctx iris.Context) {
 		ctx.ViewData("", page{PageID: "other page"})
 		if err := ctx.View("other.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	}

context/context.go

@@ -792,9 +792,9 @@ func (ctx *Context) StopWithStatus(statusCode int) {
 //
 // If the status code is a failure one then
 // it will also fire the specified error code handler.
-func (ctx *Context) StopWithText(statusCode int, format string, args ...interface{}) {
+func (ctx *Context) StopWithText(statusCode int, text string) {
 	ctx.StopWithStatus(statusCode)
-	ctx.WriteString(fmt.Sprintf(format, args...))
+	ctx.WriteString(text)
 }
 
 // StopWithError stops the handlers chain and writes the "statusCode"
@@ -4034,15 +4034,15 @@ func (ctx *Context) Binary(data []byte) (int, error) {
 }
 
 // Text writes out a string as plain text.
-func (ctx *Context) Text(format string, args ...interface{}) (int, error) {
+func (ctx *Context) Text(text string) (int, error) {
 	ctx.ContentType(ContentTextHeaderValue)
-	return ctx.Writef(format, args...)
+	return ctx.WriteString(text)
 }
 
 // HTML writes out a string as text/html.
-func (ctx *Context) HTML(format string, args ...interface{}) (int, error) {
+func (ctx *Context) HTML(text string) (int, error) {
 	ctx.ContentType(ContentHTMLHeaderValue)
-	return ctx.Writef(format, args...)
+	return ctx.WriteString(text)
 }
 
 // ProtoMarshalOptions is a type alias for protojson.MarshalOptions.

core/router/api_builder.go

@@ -1804,7 +1804,7 @@ func (api *APIBuilder) FallbackView(provider context.FallbackViewProvider) {
 //
 //		my.Get("/", func(ctx iris.Context) {
 //		if err := ctx.View("page1.html"); err != nil {
-//		  ctx.HTML("<h3>%s</h3>", err.Error())
+//		  ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 //		  return
 //	 }
 //		})

core/router/party.go

@@ -466,7 +466,7 @@ type Party interface {
 	// my := app.Party("/my").Layout("layouts/mylayout.html")
 	// 	my.Get("/", func(ctx iris.Context) {
 	// 	if err := ctx.View("page1.html"); err != nil {
-	//	  ctx.HTML("<h3>%s</h3>", err.Error())
+	//	  ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 	//	  return
 	//  }
 	// 	})

core/router/router_test.go

@@ -1,6 +1,7 @@
 package router_test
 
 import (
+	"fmt"
 	"io"
 	"net/http"
 	"strings"
@@ -200,7 +201,7 @@ func TestNewSubdomainPartyRedirectHandler(t *testing.T) {
 func TestHandleServer(t *testing.T) {
 	otherApp := iris.New()
 	otherApp.Get("/test/me/{first:string}", func(ctx iris.Context) {
-		ctx.HTML("<h1>Other App: %s</h1>", ctx.Params().Get("first"))
+		ctx.HTML(fmt.Sprintf("<h1>Other App: %s</h1>", ctx.Params().Get("first")))
 	})
 	otherApp.Build()
 

core/router/router_wildcard_root_test.go

@@ -48,7 +48,7 @@ var h2 = func(ctx *context.Context) {
 }
 
 func h3(ctx *context.Context) {
-	ctx.Writef(staticPathPrefixBody + ctx.Path())
+	ctx.WriteString(staticPathPrefixBody + ctx.Path())
 }
 
 func TestRouterWildcardDifferentPrefixPath(t *testing.T) {

hero/dependency_test.go

@@ -1,6 +1,7 @@
 package hero_test
 
 import (
+	"errors"
 	"fmt"
 	"reflect"
 	"testing"
@@ -111,9 +112,9 @@ func TestDependentDependency(t *testing.T) {
 		},
 		{ // 3
 			Dependency: func(msg testMessage) error {
-				return fmt.Errorf(msg.Body)
+				return errors.New(msg.Body)
 			},
-			Expected: fmt.Errorf(msgBody),
+			Expected: errors.New(msgBody),
 		},
 		// Test depend on more than one previous registered dependencies and require a before-previous one.
 		{ // 4

macro/interpreter/parser/parser.go

@@ -1,6 +1,7 @@
 package parser
 
 import (
+	"errors"
 	"fmt"
 	"strconv"
 	"strings"
@@ -101,7 +102,7 @@ const (
 
 func (p ParamParser) Error() error {
 	if len(p.errors) > 0 {
-		return fmt.Errorf(strings.Join(p.errors, "\n"))
+		return errors.New(strings.Join(p.errors, "\n"))
 	}
 	return nil
 }

middleware/basicauth/error.go

@@ -96,7 +96,7 @@ func DefaultErrorHandler(ctx *context.Context, err error) {
 		unauthorize(ctx, e.AuthenticateHeader, e.AuthenticateHeaderValue, e.Code)
 	default:
 		// This will never happen.
-		ctx.StopWithText(http.StatusInternalServerError, "unknown error: %v", err)
+		ctx.StopWithText(http.StatusInternalServerError, fmt.Sprintf("unknown error: %v", err))
 	}
 }
 

mvc/controller_method_parser.go

@@ -10,6 +10,9 @@ import (
 
 	"github.com/kataras/iris/v12/core/router"
 	"github.com/kataras/iris/v12/macro"
+
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"
 )
 
 const (
@@ -137,8 +140,8 @@ func parseMethod(macros *macro.Macros, fn reflect.Method, skipper func(string) b
 }
 
 func methodTitle(httpMethod string) string {
-	httpMethodFuncName := strings.Title(strings.ToLower(httpMethod))
+	caser := cases.Title(language.English)
-	return httpMethodFuncName
+	return caser.String(strings.ToLower(httpMethod))
 }
 
 var errSkip = errors.New("skip")

mvc/controller_test.go

@@ -19,7 +19,7 @@ type testController struct {
 }
 
 var writeMethod = func(ctx *context.Context) {
-	ctx.Writef(ctx.Method())
+	ctx.WriteString(ctx.Method())
 }
 
 func (c *testController) Get() {
@@ -108,15 +108,15 @@ func (c *testControllerBeginAndEndRequestFunc) BeginRequest(ctx *context.Context
 
 // called after every method (Get() or Post()).
 func (c *testControllerBeginAndEndRequestFunc) EndRequest(ctx *context.Context) {
-	ctx.Writef("done") // append "done" to the response
+	ctx.WriteString("done") // append "done" to the response
 }
 
 func (c *testControllerBeginAndEndRequestFunc) Get() {
-	c.Ctx.Writef(c.Username)
+	c.Ctx.WriteString(c.Username)
 }
 
 func (c *testControllerBeginAndEndRequestFunc) Post() {
-	c.Ctx.Writef(c.Username)
+	c.Ctx.WriteString(c.Username)
 }
 
 func TestControllerBeginAndEndRequestFunc(t *testing.T) {
@@ -230,7 +230,7 @@ func writeModels(ctx *context.Context, names ...string) {
 			return
 		}
 
-		ctx.Writef(model.Username)
+		ctx.WriteString(model.Username)
 	}
 }
 
@@ -269,7 +269,7 @@ type testControllerBindStruct struct {
 }
 
 func (t *testControllerBindStruct) Get() {
-	t.Ctx.Writef(t.TitlePointer.title + t.TitleValue.title + t.Other)
+	t.Ctx.WriteString(t.TitlePointer.title + t.TitleValue.title + t.Other)
 }
 
 // test if context can be binded to the controller's function
@@ -291,7 +291,7 @@ func (t *testControllerBindDeep) BeforeActivation(b BeforeActivation) {
 
 func (t *testControllerBindDeep) Get() {
 	// 	t.testControllerBindStruct.Get()
-	t.Ctx.Writef(t.TitlePointer.title + t.TitleValue.title + t.Other)
+	t.Ctx.WriteString(t.TitlePointer.title + t.TitleValue.title + t.Other)
 }
 
 func (t *testControllerBindDeep) Post(v testCustomStruct) string {
@@ -338,9 +338,9 @@ func (c *testCtrl0) Get() string {
 
 func (c *testCtrl0) EndRequest(ctx *context.Context) {
 	if c.TitlePointer == nil {
-		ctx.Writef("\nTitlePointer is nil!\n")
+		ctx.WriteString("\nTitlePointer is nil!\n")
 	} else {
-		ctx.Writef(c.TitlePointer.title)
+		ctx.WriteString(c.TitlePointer.title)
 	}
 
 	// should be the same as `.testCtrl000.testCtrl0000.EndRequest(ctx)`

sessions/sessions_test.go

@@ -93,7 +93,7 @@ func testSessions(t *testing.T, app *iris.Application) {
 		ctx.Next()
 	}, func(ctx *context.Context) {
 		s := sessions.Get(ctx)
-		_, err := ctx.Writef(s.GetString("key"))
+		_, err := ctx.WriteString(s.GetString("key"))
 		if err != nil {
 			t.Fatal(err)
 		}

view/README.md

@@ -44,7 +44,7 @@ func main() {
         ctx.ViewData("message", "Hello world!")
         // Render template file: ./views/hello.html
         if err := ctx.View("hello.html"); err != nil {
-		    ctx.HTML("<h3>%s</h3>", err.Error())
+		    ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		    return
 	    }
     })
@@ -109,7 +109,7 @@ func main() {
 func hi(ctx iris.Context) {
     // render the template file "./templates/hi.html"
     if err := ctx.View("hi.html"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }
@@ -156,7 +156,7 @@ func hi(ctx iris.Context) {
     //                      {{.Page.Title}} and {{Page.Name}}
     ctx.ViewData("Page", page{Title: "Hi Page", Name: "iris"})
     if err := ctx.View("hi.html"); err != nil {
-		ctx.HTML("<h3>%s</h3>", err.Error())
+		ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 		return
 	}
 }

x/errors/errors.go

@@ -271,13 +271,13 @@ func (e ErrorCodeName) MapErrors(targets ...error) {
 }
 
 // Message sends an error with a simple message to the client.
-func (e ErrorCodeName) Message(ctx *context.Context, format string, args ...interface{}) {
+func (e ErrorCodeName) Message(ctx *context.Context, msg string) {
-	fail(ctx, e, sprintf(format, args...), "", nil, nil)
+	fail(ctx, e, msg, "", nil, nil)
 }
 
 // Details sends an error with a message and details to the client.
-func (e ErrorCodeName) Details(ctx *context.Context, msg, details string, detailsArgs ...interface{}) {
+func (e ErrorCodeName) Details(ctx *context.Context, msg, details string) {
-	fail(ctx, e, msg, sprintf(details, detailsArgs...), nil, nil)
+	fail(ctx, e, msg, msg, nil, nil)
 }
 
 // Data sends an error with a message and json data to the client.
@@ -419,7 +419,7 @@ func handleJSONError(ctx *context.Context, err error) bool {
 
 	var syntaxErr *json.SyntaxError
 	if errors.As(err, &syntaxErr) {
-		wireError.Details(ctx, messageText, "json: syntax error at byte offset %d", syntaxErr.Offset)
+		wireError.Details(ctx, messageText, fmt.Sprintf("json: syntax error at byte offset %d", syntaxErr.Offset))
 		return true
 	}
 

x/errors/handlers.go

@@ -220,7 +220,7 @@ func Validation[T any](validators ...ContextRequestFunc[T]) context.Handler {
 		return nil
 	}
 
-	validator := joinContextRequestFuncs[T](validators)
+	validator := joinContextRequestFuncs(validators)
 
 	return func(ctx *context.Context) {
 		ctx.Values().Set(contextRequestHandlerFuncKey, validator)
@@ -322,7 +322,7 @@ func Intercept[T, R any](responseHandlers ...ContextResponseFunc[T, R]) context.
 		return nil
 	}
 
-	responseHandler := joinContextResponseFuncs[T, R](responseHandlers)
+	responseHandler := joinContextResponseFuncs(responseHandlers)
 
 	return func(ctx *context.Context) {
 		ctx.Values().Set(contextResponseHandlerFuncKey, responseHandler)