chore: update linter

pkg/middlewares/accesslog/logger_test.go

@@ -74,7 +74,7 @@ func TestLogRotation(t *testing.T) {
 	halfDone := make(chan bool)
 	writeDone := make(chan bool)
 	go func() {
-		for i := 0; i < iterations; i++ {
+		for i := range iterations {
 			handler.ServeHTTP(recorder, req)
 			if i == iterations/2 {
 				halfDone <- true

pkg/middlewares/capture/capture_test.go

@@ -149,7 +149,7 @@ func BenchmarkCapture(b *testing.B) {
 			b.ReportAllocs()
 			b.SetBytes(int64(test.size))
 			b.ResetTimer()
-			for i := 0; i < b.N; i++ {
+			for range b.N {
 				runBenchmark(b, test.size, req, handlers)
 			}
 		})
@@ -170,7 +170,7 @@ func runBenchmark(b *testing.B, size int, req *http.Request, handler http.Handle
 
 func generateBytes(length int) []byte {
 	var value []byte
-	for i := 0; i < length; i++ {
+	for i := range length {
 		value = append(value, 0x61+byte(i%26))
 	}
 	return value

pkg/middlewares/compress/compress_test.go

@@ -499,7 +499,7 @@ func BenchmarkCompress(b *testing.B) {
 			}
 
 			b.ResetTimer()
-			for i := 0; i < b.N; i++ {
+			for range b.N {
 				runBenchmark(b, req, handler)
 			}
 		})
@@ -520,7 +520,7 @@ func runBenchmark(b *testing.B, req *http.Request, handler http.Handler) {
 
 func generateBytes(length int) []byte {
 	var value []byte
-	for i := 0; i < length; i++ {
+	for i := range length {
 		value = append(value, 0x61+byte(i))
 	}
 	return value

pkg/middlewares/emptybackendhandler/empty_backend_handler_test.go

@@ -58,7 +58,7 @@ func (lb *healthCheckLoadBalancer) ServeHTTP(w http.ResponseWriter, r *http.Requ
 
 func (lb *healthCheckLoadBalancer) Servers() []*url.URL {
 	servers := make([]*url.URL, lb.amountServer)
-	for i := 0; i < lb.amountServer; i++ {
+	for range lb.amountServer {
 		servers = append(servers, testhelpers.MustParseURL("http://localhost"))
 	}
 	return servers

pkg/middlewares/metrics/metrics.go

@@ -3,6 +3,7 @@ package metrics
 import (
 	"context"
 	"net/http"
+	"slices"
 	"strconv"
 	"strings"
 	"time"
@@ -175,12 +176,10 @@ func isSSERequest(req *http.Request) bool {
 
 func containsHeader(req *http.Request, name, value string) bool {
 	items := strings.Split(req.Header.Get(name), ",")
-	for _, item := range items {
-		if value == strings.ToLower(strings.TrimSpace(item)) {
-			return true
-		}
-	}
-	return false
+
+	return slices.ContainsFunc(items, func(item string) bool {
+		return value == strings.ToLower(strings.TrimSpace(item))
+	})
 }
 
 // getMethod returns the request's method.

pkg/middlewares/requestdecorator/hostresolver.go

@@ -49,7 +49,7 @@ func (hr *Resolver) CNAMEFlatten(ctx context.Context, host string) string {
 
 	logger := log.FromContext(ctx)
 	cacheDuration := 0 * time.Second
-	for depth := 0; depth < hr.ResolvDepth; depth++ {
+	for depth := range hr.ResolvDepth {
 		resolv, err := cnameResolve(ctx, request, hr.ResolvConfig)
 		if err != nil {
 			logger.Error(err)

pkg/middlewares/retry/retry_test.go

@@ -203,7 +203,7 @@ func TestMultipleRetriesShouldNotLooseHeaders(t *testing.T) {
 	}
 
 	// Validate that we don't have headers from previous attempts
-	for i := 0; i < attempt; i++ {
+	for i := range attempt {
 		headerName := fmt.Sprintf("X-Foo-Test-%d", i)
 		headerValue = responseRecorder.Header().Get("headerName")
 		if headerValue != "" {