Upgrade golangci-lint

.github/workflows/validate.yaml

@@ -7,8 +7,8 @@ on:
 
 env:
   GO_VERSION: '1.24'
-  GOLANGCI_LINT_VERSION: v2.0.2
-  MISSPELL_VERSION: v0.6.0
+  GOLANGCI_LINT_VERSION: v2.7.2
+  MISSPELL_VERSION: v0.7.0
 
 jobs:
 

.golangci.yml

@@ -36,6 +36,7 @@ linters:
     - nilnil # Not relevant
     - nlreturn # Not relevant
     - noctx # Too strict
+    - noinlineerr # Too strict
     - nonamedreturns # Too strict
     - paralleltest # Not relevant
     - prealloc # Too many false-positive.
@@ -47,6 +48,7 @@ linters:
     - varnamelen # Not relevant
     - wrapcheck # Too strict
     - wsl # Too strict
+    - wsl_v5 # Too strict
 
   settings:
     depguard:
@@ -292,15 +294,31 @@ linters:
         source: 'errors.New\("Nomad provider'
         text: 'ST1005: error strings should not be capitalized'
       - path: (.+)\.go
-        text: 'struct-tag: unknown option ''inline'' in JSON tag'
+        text: 'omitzero: Omitempty has no effect on nested struct field'
+        linters:
+          - modernize
+      - path: (.+)\.go
+        text: 'struct-tag: unknown option "inline" in json tag'
         linters:
           - revive
       - path: (.+)\.go
-        text: 'struct-tag: unknown option ''omitzero'' in TOML tag'
+        text: 'struct-tag: unknown option "omitzero" in toml tag'
+        linters:
+          - revive
+      - path: (pkg/types/.+|pkg/api/.+)\.go
+        text: 'var-naming: avoid meaningless package names'
+        linters:
+          - revive
+      - path: (pkg/muxer/http/.+|pkg/provider/http/.+)\.go
+        text: 'var-naming: avoid package names that conflict with Go standard library package names'
         linters:
           - revive
       - path: (.+)\.go$
         text: 'SA1019: http.CloseNotifier has been deprecated' # FIXME must be fixed
+      - path: (.+)\.go$
+        text: 'SA1019: dynamic.(TCPIPWhiteList|IPWhiteList) is deprecated: please use IPAllowList instead.'
+      - path: (.+)\.go$
+        text: 'SA1019: middlewareTCP.Spec.IPWhiteList is deprecated: please use IPAllowList instead.'
       - path: (.+)\.go$
         text: 'SA1019: cfg.(SSLRedirect|SSLTemporaryRedirect|SSLHost|SSLForceHost|FeaturePolicy) is deprecated'
       - path: (.+)\.go$

cmd/configuration.go

@@ -10,6 +10,7 @@ import (
 // TraefikCmdConfiguration wraps the static configuration and extra parameters.
 type TraefikCmdConfiguration struct {
 	static.Configuration `export:"true"`
+
 	// ConfigFile is the path to the configuration file.
 	ConfigFile string `description:"Configuration file to use. If specified all other flags are ignored." export:"true"`
 }

cmd/internal/gen/main.go

@@ -83,7 +83,7 @@ func run(dest string) error {
 		return err
 	}
 
-	return os.WriteFile(filepath.Join(dest, "marshaler.go"), []byte(fmt.Sprintf(marsh, destPkg)), 0o666)
+	return os.WriteFile(filepath.Join(dest, "marshaler.go"), fmt.Appendf(nil, marsh, destPkg), 0o666)
 }
 
 func cleanType(typ types.Type, base string) string {

docs/content/reference/dynamic-configuration/kubernetes-crd-definition-v1.yml

@@ -1273,6 +1273,7 @@ spec:
                   IPWhiteList holds the IP whitelist middleware configuration.
                   This middleware limits allowed requests based on the client IP.
                   More info: https://doc.traefik.io/traefik/v2.11/middlewares/http/ipwhitelist/
+
                   Deprecated: please use IPAllowList instead.
                 properties:
                   ipStrategy:
@@ -1663,8 +1664,9 @@ spec:
                 description: |-
                   IPWhiteList defines the IPWhiteList middleware configuration.
                   This middleware accepts/refuses connections based on the client IP.
-                  Deprecated: please use IPAllowList instead.
                   More info: https://doc.traefik.io/traefik/v2.11/middlewares/tcp/ipwhitelist/
+
+                  Deprecated: please use IPAllowList instead.
                 properties:
                   sourceRange:
                     description: SourceRange defines the allowed IPs (or ranges of
@@ -1907,6 +1909,7 @@ spec:
                 description: |-
                   PreferServerCipherSuites defines whether the server chooses a cipher suite among his own instead of among the client's.
                   It is enabled automatically when minVersion or maxVersion is set.
+
                   Deprecated: https://github.com/golang/go/issues/45430
                 type: boolean
               sniStrict:
@@ -3703,6 +3706,7 @@ spec:
                   IPWhiteList holds the IP whitelist middleware configuration.
                   This middleware limits allowed requests based on the client IP.
                   More info: https://doc.traefik.io/traefik/v2.11/middlewares/http/ipwhitelist/
+
                   Deprecated: please use IPAllowList instead.
                 properties:
                   ipStrategy:
@@ -4093,8 +4097,9 @@ spec:
                 description: |-
                   IPWhiteList defines the IPWhiteList middleware configuration.
                   This middleware accepts/refuses connections based on the client IP.
-                  Deprecated: please use IPAllowList instead.
                   More info: https://doc.traefik.io/traefik/v2.11/middlewares/tcp/ipwhitelist/
+
+                  Deprecated: please use IPAllowList instead.
                 properties:
                   sourceRange:
                     description: SourceRange defines the allowed IPs (or ranges of
@@ -4337,6 +4342,7 @@ spec:
                 description: |-
                   PreferServerCipherSuites defines whether the server chooses a cipher suite among his own instead of among the client's.
                   It is enabled automatically when minVersion or maxVersion is set.
+
                   Deprecated: https://github.com/golang/go/issues/45430
                 type: boolean
               sniStrict:

docs/content/reference/dynamic-configuration/traefik.containo.us_middlewares.yaml

@@ -658,6 +658,7 @@ spec:
                   IPWhiteList holds the IP whitelist middleware configuration.
                   This middleware limits allowed requests based on the client IP.
                   More info: https://doc.traefik.io/traefik/v2.11/middlewares/http/ipwhitelist/
+
                   Deprecated: please use IPAllowList instead.
                 properties:
                   ipStrategy:

docs/content/reference/dynamic-configuration/traefik.containo.us_middlewaretcps.yaml

@@ -68,8 +68,9 @@ spec:
                 description: |-
                   IPWhiteList defines the IPWhiteList middleware configuration.
                   This middleware accepts/refuses connections based on the client IP.
-                  Deprecated: please use IPAllowList instead.
                   More info: https://doc.traefik.io/traefik/v2.11/middlewares/tcp/ipwhitelist/
+
+                  Deprecated: please use IPAllowList instead.
                 properties:
                   sourceRange:
                     description: SourceRange defines the allowed IPs (or ranges of

docs/content/reference/dynamic-configuration/traefik.containo.us_tlsoptions.yaml

@@ -99,6 +99,7 @@ spec:
                 description: |-
                   PreferServerCipherSuites defines whether the server chooses a cipher suite among his own instead of among the client's.
                   It is enabled automatically when minVersion or maxVersion is set.
+
                   Deprecated: https://github.com/golang/go/issues/45430
                 type: boolean
               sniStrict:

docs/content/reference/dynamic-configuration/traefik.io_middlewares.yaml

@@ -658,6 +658,7 @@ spec:
                   IPWhiteList holds the IP whitelist middleware configuration.
                   This middleware limits allowed requests based on the client IP.
                   More info: https://doc.traefik.io/traefik/v2.11/middlewares/http/ipwhitelist/
+
                   Deprecated: please use IPAllowList instead.
                 properties:
                   ipStrategy:

docs/content/reference/dynamic-configuration/traefik.io_middlewaretcps.yaml

@@ -68,8 +68,9 @@ spec:
                 description: |-
                   IPWhiteList defines the IPWhiteList middleware configuration.
                   This middleware accepts/refuses connections based on the client IP.
-                  Deprecated: please use IPAllowList instead.
                   More info: https://doc.traefik.io/traefik/v2.11/middlewares/tcp/ipwhitelist/
+
+                  Deprecated: please use IPAllowList instead.
                 properties:
                   sourceRange:
                     description: SourceRange defines the allowed IPs (or ranges of

docs/content/reference/dynamic-configuration/traefik.io_tlsoptions.yaml

@@ -99,6 +99,7 @@ spec:
                 description: |-
                   PreferServerCipherSuites defines whether the server chooses a cipher suite among his own instead of among the client's.
                   It is enabled automatically when minVersion or maxVersion is set.
+
                   Deprecated: https://github.com/golang/go/issues/45430
                 type: boolean
               sniStrict:

docs/mkdocs.yml

@@ -28,7 +28,7 @@ theme:
     prev: 'Previous'
     next: 'Next'
 
-copyright: 'Traefik Labs • Copyright © 2016-2025'
+copyright: 'Traefik Labs • Copyright © 2016-2026'
 
 extra_javascript:
   - assets/js/hljs/highlight.pack.js # Download from https://highlightjs.org/download/ and enable YAML, TOML and Dockerfile

integration/access_log_test.go

@@ -245,8 +245,7 @@ func digestParts(resp *http.Response) map[string]string {
 	result := map[string]string{}
 	if len(resp.Header["Www-Authenticate"]) > 0 {
 		wantedHeaders := []string{"nonce", "realm", "qop", "opaque"}
-		responseHeaders := strings.Split(resp.Header["Www-Authenticate"][0], ",")
-		for _, r := range responseHeaders {
+		for r := range strings.SplitSeq(resp.Header["Www-Authenticate"][0], ",") {
 			for _, w := range wantedHeaders {
 				if strings.Contains(r, w) {
 					result[w] = strings.Split(r, `"`)[1]

integration/acme_test.go

@@ -27,6 +27,7 @@ import (
 // ACME test suites.
 type AcmeSuite struct {
 	BaseSuite
+
 	pebbleIP      string
 	fakeDNSServer *dns.Server
 }
@@ -63,11 +64,6 @@ const (
 	wildcardDomain = "*.acme.wtf"
 )
 
-func (s *AcmeSuite) getAcmeURL() string {
-	return fmt.Sprintf("https://%s/dir",
-		net.JoinHostPort(s.pebbleIP, "14000"))
-}
-
 func setupPebbleRootCA() (*http.Transport, error) {
 	path, err := filepath.Abs("fixtures/acme/ssl/pebble.minica.pem")
 	if err != nil {
@@ -540,3 +536,8 @@ func (s *AcmeSuite) retrieveAcmeCertificate(testCase acmeTestCase) {
 		assert.Equal(s.T(), sub.expectedAlgorithm, gotPublicKeyAlgorithm)
 	}
 }
+
+func (s *AcmeSuite) getAcmeURL() string {
+	return fmt.Sprintf("https://%s/dir",
+		net.JoinHostPort(s.pebbleIP, "14000"))
+}

integration/consul_catalog_test.go

@@ -16,6 +16,7 @@ import (
 
 type ConsulCatalogSuite struct {
 	BaseSuite
+
 	consulClient      *api.Client
 	consulAgentClient *api.Client
 	consulURL         string
@@ -53,47 +54,6 @@ func (s *ConsulCatalogSuite) TearDownSuite() {
 	s.BaseSuite.TearDownSuite()
 }
 
-func (s *ConsulCatalogSuite) waitToElectConsulLeader() error {
-	return try.Do(15*time.Second, func() error {
-		leader, err := s.consulClient.Status().Leader()
-
-		if err != nil || len(leader) == 0 {
-			return fmt.Errorf("leader not found. %w", err)
-		}
-
-		return nil
-	})
-}
-
-func (s *ConsulCatalogSuite) waitForConnectCA() error {
-	return try.Do(15*time.Second, func() error {
-		caroots, _, err := s.consulClient.Connect().CARoots(nil)
-
-		if err != nil || len(caroots.Roots) == 0 {
-			return fmt.Errorf("connect CA not fully initialized. %w", err)
-		}
-
-		return nil
-	})
-}
-
-func (s *ConsulCatalogSuite) registerService(reg *api.AgentServiceRegistration, onAgent bool) error {
-	client := s.consulClient
-	if onAgent {
-		client = s.consulAgentClient
-	}
-
-	return client.Agent().ServiceRegister(reg)
-}
-
-func (s *ConsulCatalogSuite) deregisterService(id string, onAgent bool) error {
-	client := s.consulClient
-	if onAgent {
-		client = s.consulAgentClient
-	}
-	return client.Agent().ServiceDeregister(id)
-}
-
 func (s *ConsulCatalogSuite) TestWithNotExposedByDefaultAndDefaultsSettings() {
 	reg1 := &api.AgentServiceRegistration{
 		ID:      "whoami1",
@@ -847,3 +807,44 @@ func (s *ConsulCatalogSuite) TestConsulConnect_NotAware() {
 	err = s.deregisterService("whoami1", false)
 	require.NoError(s.T(), err)
 }
+
+func (s *ConsulCatalogSuite) waitToElectConsulLeader() error {
+	return try.Do(15*time.Second, func() error {
+		leader, err := s.consulClient.Status().Leader()
+
+		if err != nil || len(leader) == 0 {
+			return fmt.Errorf("leader not found. %w", err)
+		}
+
+		return nil
+	})
+}
+
+func (s *ConsulCatalogSuite) waitForConnectCA() error {
+	return try.Do(15*time.Second, func() error {
+		caroots, _, err := s.consulClient.Connect().CARoots(nil)
+
+		if err != nil || len(caroots.Roots) == 0 {
+			return fmt.Errorf("connect CA not fully initialized. %w", err)
+		}
+
+		return nil
+	})
+}
+
+func (s *ConsulCatalogSuite) registerService(reg *api.AgentServiceRegistration, onAgent bool) error {
+	client := s.consulClient
+	if onAgent {
+		client = s.consulAgentClient
+	}
+
+	return client.Agent().ServiceRegister(reg)
+}
+
+func (s *ConsulCatalogSuite) deregisterService(id string, onAgent bool) error {
+	client := s.consulClient
+	if onAgent {
+		client = s.consulAgentClient
+	}
+	return client.Agent().ServiceDeregister(id)
+}

integration/consul_test.go

@@ -26,6 +26,7 @@ import (
 // Consul test suites.
 type ConsulSuite struct {
 	BaseSuite
+
 	kvClient  store.Store
 	consulURL string
 }
@@ -164,16 +165,6 @@ func (s *ConsulSuite) TestSimpleConfiguration() {
 	}
 }
 
-func (s *ConsulSuite) assertWhoami(host string, expectedStatusCode int) {
-	req, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:8000", nil)
-	require.NoError(s.T(), err)
-	req.Host = host
-
-	resp, err := try.ResponseUntilStatusCode(req, 15*time.Second, expectedStatusCode)
-	require.NoError(s.T(), err)
-	resp.Body.Close()
-}
-
 func (s *ConsulSuite) TestDeleteRootKey() {
 	// This test case reproduce the issue: https://github.com/traefik/traefik/issues/8092
 
@@ -222,3 +213,13 @@ func (s *ConsulSuite) TestDeleteRootKey() {
 	s.assertWhoami("kv1.localhost", http.StatusNotFound)
 	s.assertWhoami("kv2.localhost", http.StatusNotFound)
 }
+
+func (s *ConsulSuite) assertWhoami(host string, expectedStatusCode int) {
+	req, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:8000", nil)
+	require.NoError(s.T(), err)
+	req.Host = host
+
+	resp, err := try.ResponseUntilStatusCode(req, 15*time.Second, expectedStatusCode)
+	require.NoError(s.T(), err)
+	resp.Body.Close()
+}

integration/docker_test.go

@@ -81,7 +81,7 @@ func (s *DockerSuite) TestDefaultDockerContainers() {
 	body, err := io.ReadAll(resp.Body)
 	require.NoError(s.T(), err)
 
-	var version map[string]interface{}
+	var version map[string]any
 
 	assert.NoError(s.T(), json.Unmarshal(body, &version))
 	assert.Equal(s.T(), "swarm/1.0.0", version["Version"])
@@ -145,7 +145,7 @@ func (s *DockerSuite) TestDockerContainersWithLabels() {
 	body, err := io.ReadAll(resp.Body)
 	require.NoError(s.T(), err)
 
-	var version map[string]interface{}
+	var version map[string]any
 
 	assert.NoError(s.T(), json.Unmarshal(body, &version))
 	assert.Equal(s.T(), "swarm/1.0.0", version["Version"])
@@ -203,7 +203,7 @@ func (s *DockerSuite) TestRestartDockerContainers() {
 	body, err := io.ReadAll(resp.Body)
 	require.NoError(s.T(), err)
 
-	var version map[string]interface{}
+	var version map[string]any
 
 	assert.NoError(s.T(), json.Unmarshal(body, &version))
 	assert.Equal(s.T(), "swarm/1.0.0", version["Version"])

integration/error_pages_test.go

@@ -14,6 +14,7 @@ import (
 // ErrorPagesSuite test suites.
 type ErrorPagesSuite struct {
 	BaseSuite
+
 	ErrorPageIP string
 	BackendIP   string
 }

integration/etcd_test.go

@@ -24,6 +24,7 @@ import (
 // etcd test suites.
 type EtcdSuite struct {
 	BaseSuite
+
 	kvClient store.Store
 	etcdAddr string
 }

integration/fixtures/k8s/01-traefik-crd.yml

@@ -1273,6 +1273,7 @@ spec:
                   IPWhiteList holds the IP whitelist middleware configuration.
                   This middleware limits allowed requests based on the client IP.
                   More info: https://doc.traefik.io/traefik/v2.11/middlewares/http/ipwhitelist/
+
                   Deprecated: please use IPAllowList instead.
                 properties:
                   ipStrategy:
@@ -1663,8 +1664,9 @@ spec:
                 description: |-
                   IPWhiteList defines the IPWhiteList middleware configuration.
                   This middleware accepts/refuses connections based on the client IP.
-                  Deprecated: please use IPAllowList instead.
                   More info: https://doc.traefik.io/traefik/v2.11/middlewares/tcp/ipwhitelist/
+
+                  Deprecated: please use IPAllowList instead.
                 properties:
                   sourceRange:
                     description: SourceRange defines the allowed IPs (or ranges of
@@ -1907,6 +1909,7 @@ spec:
                 description: |-
                   PreferServerCipherSuites defines whether the server chooses a cipher suite among his own instead of among the client's.
                   It is enabled automatically when minVersion or maxVersion is set.
+
                   Deprecated: https://github.com/golang/go/issues/45430
                 type: boolean
               sniStrict:
@@ -3703,6 +3706,7 @@ spec:
                   IPWhiteList holds the IP whitelist middleware configuration.
                   This middleware limits allowed requests based on the client IP.
                   More info: https://doc.traefik.io/traefik/v2.11/middlewares/http/ipwhitelist/
+
                   Deprecated: please use IPAllowList instead.
                 properties:
                   ipStrategy:
@@ -4093,8 +4097,9 @@ spec:
                 description: |-
                   IPWhiteList defines the IPWhiteList middleware configuration.
                   This middleware accepts/refuses connections based on the client IP.
-                  Deprecated: please use IPAllowList instead.
                   More info: https://doc.traefik.io/traefik/v2.11/middlewares/tcp/ipwhitelist/
+
+                  Deprecated: please use IPAllowList instead.
                 properties:
                   sourceRange:
                     description: SourceRange defines the allowed IPs (or ranges of
@@ -4337,6 +4342,7 @@ spec:
                 description: |-
                   PreferServerCipherSuites defines whether the server chooses a cipher suite among his own instead of among the client's.
                   It is enabled automatically when minVersion or maxVersion is set.
+
                   Deprecated: https://github.com/golang/go/issues/45430
                 type: boolean
               sniStrict:

integration/healthcheck_test.go

@@ -19,6 +19,7 @@ import (
 // HealthCheck test suites.
 type HealthCheckSuite struct {
 	BaseSuite
+
 	whoami1IP string
 	whoami2IP string
 	whoami3IP string
@@ -305,7 +306,7 @@ func (s *HealthCheckSuite) TestPropagate() {
 		require.NoError(s.T(), err)
 	}
 
-	try.Sleep(time.Second)
+	try.Sleep(time.Second) //nolint:staticcheck // Intentional use for integration test timing.
 
 	want2 := `IP: ` + s.whoami2IP
 	want4 := `IP: ` + s.whoami4IP
@@ -387,7 +388,7 @@ func (s *HealthCheckSuite) TestPropagate() {
 		require.NoError(s.T(), err)
 	}
 
-	try.Sleep(time.Second)
+	try.Sleep(time.Second) //nolint:staticcheck // Intentional use for integration test timing.
 
 	// Verify that everything is down, and that we get 503s everywhere.
 	for range 2 {
@@ -413,7 +414,7 @@ func (s *HealthCheckSuite) TestPropagate() {
 		require.NoError(s.T(), err)
 	}
 
-	try.Sleep(time.Second)
+	try.Sleep(time.Second) //nolint:staticcheck // Intentional use for integration test timing.
 
 	// Verify everything is up on root router.
 	reachedServers = make(map[string]int)

integration/helloworld/helloworld.pb.go

@@ -187,7 +187,7 @@ func RegisterGreeterServer(s *grpc.Server, srv GreeterServer) {
 	s.RegisterService(&_Greeter_serviceDesc, srv)
 }
 
-func _Greeter_SayHello_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+func _Greeter_SayHello_Handler(srv any, ctx context.Context, dec func(any) error, interceptor grpc.UnaryServerInterceptor) (any, error) {
 	in := new(HelloRequest)
 	if err := dec(in); err != nil {
 		return nil, err
@@ -199,13 +199,13 @@ func _Greeter_SayHello_Handler(srv interface{}, ctx context.Context, dec func(in
 		Server:     srv,
 		FullMethod: "/helloworld.Greeter/SayHello",
 	}
-	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+	handler := func(ctx context.Context, req any) (any, error) {
 		return srv.(GreeterServer).SayHello(ctx, req.(*HelloRequest))
 	}
 	return interceptor(ctx, in, info, handler)
 }
 
-func _Greeter_StreamExample_Handler(srv interface{}, stream grpc.ServerStream) error {
+func _Greeter_StreamExample_Handler(srv any, stream grpc.ServerStream) error {
 	m := new(StreamExampleRequest)
 	if err := stream.RecvMsg(m); err != nil {
 		return err

integration/https_test.go

@@ -876,40 +876,6 @@ func (s *HTTPSSuite) TestWithSNIDynamicConfigRouteWithTlsConfigurationDeletion()
 	require.NoError(s.T(), err)
 }
 
-// modifyCertificateConfFileContent replaces the content of a HTTPS configuration file.
-func (s *HTTPSSuite) modifyCertificateConfFileContent(certFileName, confFileName string) {
-	file, err := os.OpenFile("./"+confFileName, os.O_WRONLY, os.ModeExclusive)
-	require.NoError(s.T(), err)
-	defer func() {
-		file.Close()
-	}()
-	err = file.Truncate(0)
-	require.NoError(s.T(), err)
-
-	// If certificate file is not provided, just truncate the configuration file
-	if len(certFileName) > 0 {
-		tlsConf := dynamic.Configuration{
-			TLS: &dynamic.TLSConfiguration{
-				Certificates: []*traefiktls.CertAndStores{
-					{
-						Certificate: traefiktls.Certificate{
-							CertFile: traefiktls.FileOrContent("fixtures/https/" + certFileName + ".cert"),
-							KeyFile:  traefiktls.FileOrContent("fixtures/https/" + certFileName + ".key"),
-						},
-					},
-				},
-			},
-		}
-
-		var confBuffer bytes.Buffer
-		err := toml.NewEncoder(&confBuffer).Encode(tlsConf)
-		require.NoError(s.T(), err)
-
-		_, err = file.Write(confBuffer.Bytes())
-		require.NoError(s.T(), err)
-	}
-}
-
 func (s *HTTPSSuite) TestEntryPointHttpsRedirectAndPathModification() {
 	file := s.adaptFile("fixtures/https/https_redirect.toml", struct{}{})
 	s.traefikCmd(withConfigFile(file))
@@ -1176,6 +1142,40 @@ func (s *HTTPSSuite) TestWithInvalidTLSOption() {
 	}
 }
 
+// modifyCertificateConfFileContent replaces the content of a HTTPS configuration file.
+func (s *HTTPSSuite) modifyCertificateConfFileContent(certFileName, confFileName string) {
+	file, err := os.OpenFile("./"+confFileName, os.O_WRONLY, os.ModeExclusive)
+	require.NoError(s.T(), err)
+	defer func() {
+		file.Close()
+	}()
+	err = file.Truncate(0)
+	require.NoError(s.T(), err)
+
+	// If certificate file is not provided, just truncate the configuration file
+	if len(certFileName) > 0 {
+		tlsConf := dynamic.Configuration{
+			TLS: &dynamic.TLSConfiguration{
+				Certificates: []*traefiktls.CertAndStores{
+					{
+						Certificate: traefiktls.Certificate{
+							CertFile: traefiktls.FileOrContent("fixtures/https/" + certFileName + ".cert"),
+							KeyFile:  traefiktls.FileOrContent("fixtures/https/" + certFileName + ".key"),
+						},
+					},
+				},
+			},
+		}
+
+		var confBuffer bytes.Buffer
+		err := toml.NewEncoder(&confBuffer).Encode(tlsConf)
+		require.NoError(s.T(), err)
+
+		_, err = file.Write(confBuffer.Bytes())
+		require.NoError(s.T(), err)
+	}
+}
+
 func (s *SimpleSuite) TestMaxConcurrentStream() {
 	file := s.adaptFile("fixtures/https/max_concurrent_stream.toml", struct{}{})
 

integration/integration_test.go

@@ -61,45 +61,12 @@ type composeDeploy struct {
 
 type BaseSuite struct {
 	suite.Suite
+
 	containers map[string]testcontainers.Container
 	network    *testcontainers.DockerNetwork
 	hostIP     string
 }
 
-func (s *BaseSuite) waitForTraefik(containerName string) {
-	time.Sleep(1 * time.Second)
-
-	// Wait for Traefik to turn ready.
-	req, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:8080/api/rawdata", nil)
-	require.NoError(s.T(), err)
-
-	err = try.Request(req, 2*time.Second, try.StatusCodeIs(http.StatusOK), try.BodyContains(containerName))
-	require.NoError(s.T(), err)
-}
-
-func (s *BaseSuite) displayTraefikLogFile(path string) {
-	if s.T().Failed() {
-		if _, err := os.Stat(path); !os.IsNotExist(err) {
-			content, errRead := os.ReadFile(path)
-			// TODO TestName
-			// fmt.Printf("%s: Traefik logs: \n", c.TestName())
-			fmt.Print("Traefik logs: \n")
-			if errRead == nil {
-				fmt.Println(string(content))
-			} else {
-				fmt.Println(errRead)
-			}
-		} else {
-			// fmt.Printf("%s: No Traefik logs.\n", c.TestName())
-			fmt.Print("No Traefik logs.\n")
-		}
-		errRemove := os.Remove(path)
-		if errRemove != nil {
-			fmt.Println(errRemove)
-		}
-	}
-}
-
 func (s *BaseSuite) SetupSuite() {
 	if isDockerDesktop(context.Background(), s.T()) {
 		_, err := os.Stat(tailscaleSecretFilePath)
@@ -400,7 +367,7 @@ func (s *BaseSuite) displayTraefikLog(output *bytes.Buffer) {
 	if output == nil || output.Len() == 0 {
 		log.WithoutContext().Info("No Traefik logs.")
 	} else {
-		for _, line := range strings.Split(output.String(), "\n") {
+		for line := range strings.SplitSeq(output.String(), "\n") {
 			log.WithoutContext().Info(line)
 		}
 	}
@@ -416,7 +383,7 @@ func (s *BaseSuite) getDockerHost() string {
 	return dockerHost
 }
 
-func (s *BaseSuite) adaptFile(path string, tempObjects interface{}) string {
+func (s *BaseSuite) adaptFile(path string, tempObjects any) string {
 	// Load file
 	tmpl, err := template.ParseFiles(path)
 	require.NoError(s.T(), err)
@@ -504,3 +471,37 @@ func (s *BaseSuite) composeExec(service string, args ...string) string {
 
 	return string(content)
 }
+
+func (s *BaseSuite) waitForTraefik(containerName string) {
+	time.Sleep(1 * time.Second)
+
+	// Wait for Traefik to turn ready.
+	req, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:8080/api/rawdata", nil)
+	require.NoError(s.T(), err)
+
+	err = try.Request(req, 2*time.Second, try.StatusCodeIs(http.StatusOK), try.BodyContains(containerName))
+	require.NoError(s.T(), err)
+}
+
+func (s *BaseSuite) displayTraefikLogFile(path string) {
+	if s.T().Failed() {
+		if _, err := os.Stat(path); !os.IsNotExist(err) {
+			content, errRead := os.ReadFile(path)
+			// TODO TestName
+			// fmt.Printf("%s: Traefik logs: \n", c.TestName())
+			fmt.Print("Traefik logs: \n")
+			if errRead == nil {
+				fmt.Println(string(content))
+			} else {
+				fmt.Println(errRead)
+			}
+		} else {
+			// fmt.Printf("%s: No Traefik logs.\n", c.TestName())
+			fmt.Print("No Traefik logs.\n")
+		}
+		errRemove := os.Remove(path)
+		if errRemove != nil {
+			fmt.Println(errRemove)
+		}
+	}
+}

integration/log_rotation_test.go

@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 package integration
 

integration/marathon15_test.go

@@ -14,6 +14,7 @@ import (
 // Marathon test suites.
 type MarathonSuite15 struct {
 	BaseSuite
+
 	marathonURL string
 }
 

integration/marathon_test.go

@@ -16,6 +16,7 @@ const containerNameMarathon = "marathon"
 // Marathon test suites.
 type MarathonSuite struct {
 	BaseSuite
+
 	marathonURL string
 }
 

integration/proxy_protocol_test.go

@@ -3,6 +3,7 @@ package integration
 import (
 	"bufio"
 	"net"
+	"strings"
 	"testing"
 	"time"
 
@@ -15,6 +16,7 @@ import (
 
 type ProxyProtocolSuite struct {
 	BaseSuite
+
 	whoamiIP string
 }
 
@@ -124,15 +126,16 @@ func proxyProtoRequest(address string, version byte) (string, error) {
 	}
 
 	// Read the response from the server
-	var content string
+	var content strings.Builder
 	scanner := bufio.NewScanner(conn)
 	for scanner.Scan() {
-		content += scanner.Text() + "\n"
+		content.WriteString(scanner.Text())
+		content.WriteString("\n")
 	}
 
 	if scanner.Err() != nil {
 		return "", err
 	}
 
-	return content, nil
+	return content.String(), nil
 }

integration/ratelimit_test.go

@@ -12,6 +12,7 @@ import (
 
 type RateLimitSuite struct {
 	BaseSuite
+
 	ServerIP string
 }
 

integration/redis_sentinel_test.go

@@ -29,6 +29,7 @@ import (
 // Redis test suites.
 type RedisSentinelSuite struct {
 	BaseSuite
+
 	kvClient       store.Store
 	redisEndpoints []string
 }
@@ -76,36 +77,6 @@ func (s *RedisSentinelSuite) TearDownSuite() {
 	}
 }
 
-func (s *RedisSentinelSuite) setupSentinelConfiguration(ports []string) {
-	for i, port := range ports {
-		templateValue := struct{ SentinelPort string }{SentinelPort: port}
-
-		// Load file
-		templateFile := "resources/compose/config/sentinel_template.conf"
-		tmpl, err := template.ParseFiles(templateFile)
-		require.NoError(s.T(), err)
-
-		folder, prefix := filepath.Split(templateFile)
-
-		fileName := fmt.Sprintf("%s/sentinel%d.conf", folder, i+1)
-		tmpFile, err := os.Create(fileName)
-		require.NoError(s.T(), err)
-		defer tmpFile.Close()
-
-		err = tmpFile.Chmod(0o666)
-		require.NoError(s.T(), err)
-
-		model := structs.Map(templateValue)
-		model["SelfFilename"] = tmpFile.Name()
-
-		err = tmpl.ExecuteTemplate(tmpFile, prefix, model)
-		require.NoError(s.T(), err)
-
-		err = tmpFile.Sync()
-		require.NoError(s.T(), err)
-	}
-}
-
 func (s *RedisSentinelSuite) TestSentinelConfiguration() {
 	file := s.adaptFile("fixtures/redis/sentinel.toml", struct{ RedisAddress string }{
 		RedisAddress: strings.Join(s.redisEndpoints, `","`),
@@ -202,3 +173,33 @@ func (s *RedisSentinelSuite) TestSentinelConfiguration() {
 		log.WithoutContext().Info(text)
 	}
 }
+
+func (s *RedisSentinelSuite) setupSentinelConfiguration(ports []string) {
+	for i, port := range ports {
+		templateValue := struct{ SentinelPort string }{SentinelPort: port}
+
+		// Load file
+		templateFile := "resources/compose/config/sentinel_template.conf"
+		tmpl, err := template.ParseFiles(templateFile)
+		require.NoError(s.T(), err)
+
+		folder, prefix := filepath.Split(templateFile)
+
+		fileName := fmt.Sprintf("%s/sentinel%d.conf", folder, i+1)
+		tmpFile, err := os.Create(fileName)
+		require.NoError(s.T(), err)
+		defer tmpFile.Close()
+
+		err = tmpFile.Chmod(0o666)
+		require.NoError(s.T(), err)
+
+		model := structs.Map(templateValue)
+		model["SelfFilename"] = tmpFile.Name()
+
+		err = tmpl.ExecuteTemplate(tmpFile, prefix, model)
+		require.NoError(s.T(), err)
+
+		err = tmpFile.Sync()
+		require.NoError(s.T(), err)
+	}
+}

integration/redis_test.go

@@ -25,6 +25,7 @@ import (
 // Redis test suites.
 type RedisSuite struct {
 	BaseSuite
+
 	kvClient       store.Store
 	redisEndpoints []string
 }

integration/rest_test.go

@@ -18,6 +18,7 @@ import (
 
 type RestSuite struct {
 	BaseSuite
+
 	whoamiAddr string
 }
 

integration/retry_test.go

@@ -15,6 +15,7 @@ import (
 
 type RetrySuite struct {
 	BaseSuite
+
 	whoamiIP string
 }
 

integration/tracing_test.go

@@ -12,6 +12,7 @@ import (
 
 type TracingSuite struct {
 	BaseSuite
+
 	whoamiIP       string
 	whoamiPort     int
 	tracerZipkinIP string
@@ -43,15 +44,6 @@ func (s *TracingSuite) TearDownSuite() {
 	s.BaseSuite.TearDownSuite()
 }
 
-func (s *TracingSuite) startZipkin() {
-	s.composeUp("zipkin")
-	s.tracerZipkinIP = s.getComposeServiceIP("zipkin")
-
-	// Wait for Zipkin to turn ready.
-	err := try.GetRequest("http://"+s.tracerZipkinIP+":9411/api/v2/services", 20*time.Second, try.StatusCodeIs(http.StatusOK))
-	require.NoError(s.T(), err)
-}
-
 func (s *TracingSuite) TestZipkinRateLimit() {
 	s.startZipkin()
 
@@ -141,15 +133,6 @@ func (s *TracingSuite) TestZipkinAuth() {
 	require.NoError(s.T(), err)
 }
 
-func (s *TracingSuite) startJaeger() {
-	s.composeUp("jaeger", "whoami")
-	s.tracerJaegerIP = s.getComposeServiceIP("jaeger")
-
-	// Wait for Jaeger to turn ready.
-	err := try.GetRequest("http://"+s.tracerJaegerIP+":16686/api/services", 20*time.Second, try.StatusCodeIs(http.StatusOK))
-	require.NoError(s.T(), err)
-}
-
 func (s *TracingSuite) TestJaegerRateLimit() {
 	s.startJaeger()
 	// defer s.composeStop(c, "jaeger")
@@ -290,3 +273,21 @@ func (s *TracingSuite) TestJaegerAuthCollector() {
 	err = try.GetRequest("http://"+s.tracerJaegerIP+":16686/api/traces?service=tracing", 20*time.Second, try.BodyContains("EntryPoint web", "basic-auth@file"))
 	require.NoError(s.T(), err)
 }
+
+func (s *TracingSuite) startZipkin() {
+	s.composeUp("zipkin")
+	s.tracerZipkinIP = s.getComposeServiceIP("zipkin")
+
+	// Wait for Zipkin to turn ready.
+	err := try.GetRequest("http://"+s.tracerZipkinIP+":9411/api/v2/services", 20*time.Second, try.StatusCodeIs(http.StatusOK))
+	require.NoError(s.T(), err)
+}
+
+func (s *TracingSuite) startJaeger() {
+	s.composeUp("jaeger", "whoami")
+	s.tracerJaegerIP = s.getComposeServiceIP("jaeger")
+
+	// Wait for Jaeger to turn ready.
+	err := try.GetRequest("http://"+s.tracerJaegerIP+":16686/api/services", 20*time.Second, try.StatusCodeIs(http.StatusOK))
+	require.NoError(s.T(), err)
+}

integration/try/try.go

@@ -19,6 +19,7 @@ const (
 type timedAction func(timeout time.Duration, operation DoCondition) error
 
 // Sleep pauses the current goroutine for at least the duration d.
+//
 // Deprecated: Use only when use another Try[...] functions is not possible.
 func Sleep(d time.Duration) {
 	d = applyCIMultiplier(d)
@@ -92,10 +93,7 @@ func Do(timeout time.Duration, operation DoCondition) error {
 		panic("timeout must be larger than zero")
 	}
 
-	interval := time.Duration(math.Ceil(float64(timeout) / 15.0))
-	if interval > maxInterval {
-		interval = maxInterval
-	}
+	interval := min(time.Duration(math.Ceil(float64(timeout)/15.0)), maxInterval)
 
 	timeout = applyCIMultiplier(timeout)
 
@@ -166,7 +164,7 @@ func doRequest(action timedAction, timeout time.Duration, request *http.Request,
 func applyCIMultiplier(timeout time.Duration) time.Duration {
 	ci := os.Getenv("CI")
 	if len(ci) > 0 {
-		log.Debug("Apply CI multiplier:", CITimeoutMultiplier)
+		log.WithoutContext().Debug("Apply CI multiplier:", CITimeoutMultiplier)
 		return time.Duration(float64(timeout) * CITimeoutMultiplier)
 	}
 	return timeout

integration/zk_test.go

@@ -25,6 +25,7 @@ import (
 // Zk test suites.
 type ZookeeperSuite struct {
 	BaseSuite
+
 	kvClient      store.Store
 	zookeeperAddr string
 }

internal/gendoc.go

@@ -78,7 +78,7 @@ func main() {
 		logger.Fatal(err)
 	}
 
-	genStaticConfDoc("./docs/content/reference/static-configuration/env-ref.md", "", func(i interface{}) ([]parser.Flat, error) {
+	genStaticConfDoc("./docs/content/reference/static-configuration/env-ref.md", "", func(i any) ([]parser.Flat, error) {
 		return env.Encode(env.DefaultNamePrefix, i)
 	})
 	genStaticConfDoc("./docs/content/reference/static-configuration/cli-ref.md", "--", flag.Encode)
@@ -240,7 +240,7 @@ func clean(element any) {
 	valSvcs.SetMapIndex(reflect.ValueOf(fmt.Sprintf("%s1", valueSvcRoot.Type().Name())), reflect.Value{})
 }
 
-func genStaticConfDoc(outputFile, prefix string, encodeFn func(interface{}) ([]parser.Flat, error)) {
+func genStaticConfDoc(outputFile, prefix string, encodeFn func(any) ([]parser.Flat, error)) {
 	logger := log.WithoutContext().WithField("file", outputFile)
 
 	element := &cmd.NewTraefikConfiguration().Configuration
@@ -309,7 +309,7 @@ type errWriter struct {
 	err error
 }
 
-func (ew *errWriter) writeln(a ...interface{}) {
+func (ew *errWriter) writeln(a ...any) {
 	if ew.err != nil {
 		return
 	}
@@ -319,15 +319,15 @@ func (ew *errWriter) writeln(a ...interface{}) {
 
 func genKVDynConfDoc(outputFile string) {
 	dynConfPath := "./docs/content/reference/dynamic-configuration/file.toml"
-	conf := map[string]interface{}{}
+	conf := map[string]any{}
 	_, err := toml.DecodeFile(dynConfPath, &conf)
 	if err != nil {
-		log.Fatal(err)
+		log.WithoutContext().Fatal(err)
 	}
 
 	file, err := os.Create(outputFile)
 	if err != nil {
-		log.Fatal(err)
+		log.WithoutContext().Fatal(err)
 	}
 
 	store := storeWriter{data: map[string]string{}}
@@ -335,7 +335,7 @@ func genKVDynConfDoc(outputFile string) {
 	c := client{store: store}
 	err = c.load("traefik", conf)
 	if err != nil {
-		log.Fatal(err)
+		log.WithoutContext().Fatal(err)
 	}
 
 	var keys []string
@@ -374,10 +374,10 @@ type client struct {
 	store storeWriter
 }
 
-func (c client) load(parentKey string, conf map[string]interface{}) error {
+func (c client) load(parentKey string, conf map[string]any) error {
 	for k, v := range conf {
 		switch entry := v.(type) {
-		case map[string]interface{}:
+		case map[string]any:
 			key := path.Join(parentKey, k)
 
 			if len(entry) == 0 {
@@ -391,7 +391,7 @@ func (c client) load(parentKey string, conf map[string]interface{}) error {
 					return err
 				}
 			}
-		case []map[string]interface{}:
+		case []map[string]any:
 			for i, o := range entry {
 				key := path.Join(parentKey, k, strconv.Itoa(i))
 
@@ -399,11 +399,11 @@ func (c client) load(parentKey string, conf map[string]interface{}) error {
 					return err
 				}
 			}
-		case []interface{}:
+		case []any:
 			for i, o := range entry {
 				key := path.Join(parentKey, k, strconv.Itoa(i))
 
-				err := c.store.Put(key, []byte(fmt.Sprintf("%v", o)), nil)
+				err := c.store.Put(key, fmt.Appendf(nil, "%v", o), nil)
 				if err != nil {
 					return err
 				}
@@ -411,7 +411,7 @@ func (c client) load(parentKey string, conf map[string]interface{}) error {
 		default:
 			key := path.Join(parentKey, k)
 
-			err := c.store.Put(key, []byte(fmt.Sprintf("%v", v)), nil)
+			err := c.store.Put(key, fmt.Appendf(nil, "%v", v), nil)
 			if err != nil {
 				return err
 			}

internal/parser.go

@@ -38,7 +38,7 @@ func encodeNode(labels map[string]string, root string, node *parser.Node) {
 	}
 }
 
-func encodeRawValue(labels map[string]string, root string, rawValue interface{}) {
+func encodeRawValue(labels map[string]string, root string, rawValue any) {
 	if rawValue == nil {
 		return
 	}
@@ -47,14 +47,14 @@ func encodeRawValue(labels map[string]string, root string, rawValue interface{})
 
 	if tValue.Kind() == reflect.Map && tValue.Elem().Kind() == reflect.Interface {
 		r := reflect.ValueOf(rawValue).
-			Convert(reflect.TypeOf((map[string]interface{})(nil))).
-			Interface().(map[string]interface{})
+			Convert(reflect.TypeFor[map[string]any]()).
+			Interface().(map[string]any)
 
 		for k, v := range r {
 			switch tv := v.(type) {
 			case string:
 				labels[root+"."+k] = tv
-			case []interface{}:
+			case []any:
 				for i, e := range tv {
 					encodeRawValue(labels, fmt.Sprintf("%s.%s[%d]", root, k, i), e)
 				}

pkg/api/criterion.go

@@ -72,10 +72,7 @@ func pagination(request *http.Request, maximum int) (pageInfo, error) {
 		return pageInfo{}, fmt.Errorf("invalid request: page: %d, per_page: %d", page, perPage)
 	}
 
-	endIndex := startIndex + perPage
-	if endIndex >= maximum {
-		endIndex = maximum
-	}
+	endIndex := min(startIndex+perPage, maximum)
 
 	nextPage := 1
 	if page*perPage < maximum {

pkg/api/debug.go

@@ -15,7 +15,7 @@ func init() {
 	expvar.Publish("Goroutines2", expvar.Func(goroutines))
 }
 
-func goroutines() interface{} {
+func goroutines() any {
 	return runtime.NumGoroutine()
 }
 

pkg/api/handler.go

@@ -30,6 +30,7 @@ func writeError(rw http.ResponseWriter, msg string, code int) {
 
 type serviceInfoRepresentation struct {
 	*runtime.ServiceInfo
+
 	ServerStatus map[string]string `json:"serverStatus,omitempty"`
 }
 
@@ -147,12 +148,12 @@ func getProviderName(id string) string {
 	return strings.SplitN(id, "@", 2)[1]
 }
 
-func extractType(element interface{}) string {
+func extractType(element any) string {
 	v := reflect.ValueOf(element).Elem()
 	for i := range v.NumField() {
 		field := v.Field(i)
 
-		if field.Kind() == reflect.Map && field.Type().Elem() == reflect.TypeOf(dynamic.PluginConf{}) {
+		if field.Kind() == reflect.Map && field.Type().Elem() == reflect.TypeFor[dynamic.PluginConf]() {
 			if keys := field.MapKeys(); len(keys) == 1 {
 				return keys[0].String()
 			}

pkg/api/handler_entrypoint.go

@@ -15,6 +15,7 @@ import (
 
 type entryPointRepresentation struct {
 	*static.EntryPoint
+
 	Name string `json:"name,omitempty"`
 }
 

pkg/api/handler_entrypoint_test.go

@@ -235,7 +235,7 @@ func TestHandler_EntryPoints(t *testing.T) {
 			require.NoError(t, err)
 
 			if *updateExpected {
-				var results interface{}
+				var results any
 				err := json.Unmarshal(contents, &results)
 				require.NoError(t, err)
 

pkg/api/handler_http.go

@@ -17,6 +17,7 @@ import (
 
 type routerRepresentation struct {
 	*runtime.RouterInfo
+
 	Name     string `json:"name,omitempty"`
 	Provider string `json:"provider,omitempty"`
 }
@@ -35,6 +36,7 @@ func newRouterRepresentation(name string, rt *runtime.RouterInfo) routerRepresen
 
 type serviceRepresentation struct {
 	*runtime.ServiceInfo
+
 	ServerStatus map[string]string `json:"serverStatus,omitempty"`
 	Name         string            `json:"name,omitempty"`
 	Provider     string            `json:"provider,omitempty"`
@@ -53,6 +55,7 @@ func newServiceRepresentation(name string, si *runtime.ServiceInfo) serviceRepre
 
 type middlewareRepresentation struct {
 	*runtime.MiddlewareInfo
+
 	Name     string `json:"name,omitempty"`
 	Provider string `json:"provider,omitempty"`
 	Type     string `json:"type,omitempty"`

pkg/api/handler_http_test.go

@@ -950,7 +950,7 @@ func TestHandler_HTTP(t *testing.T) {
 			require.NoError(t, err)
 
 			if *updateExpected {
-				var results interface{}
+				var results any
 				err := json.Unmarshal(contents, &results)
 				require.NoError(t, err)
 

pkg/api/handler_overview.go

@@ -232,7 +232,7 @@ func getProviders(conf static.Configuration) []string {
 			if !field.IsNil() {
 				providers = append(providers, v.Type().Field(i).Name)
 			}
-		} else if field.Kind() == reflect.Map && field.Type().Elem() == reflect.TypeOf(static.PluginConf{}) {
+		} else if field.Kind() == reflect.Map && field.Type().Elem() == reflect.TypeFor[static.PluginConf]() {
 			for _, value := range field.MapKeys() {
 				providers = append(providers, "plugin-"+value.String())
 			}

pkg/api/handler_overview_test.go

@@ -243,7 +243,7 @@ func TestHandler_Overview(t *testing.T) {
 					Rest:              &rest.Provider{},
 					Rancher:           &rancher.Provider{},
 					Plugin: map[string]static.PluginConf{
-						"test": map[string]interface{}{},
+						"test": map[string]any{},
 					},
 				},
 			},
@@ -298,7 +298,7 @@ func TestHandler_Overview(t *testing.T) {
 			require.NoError(t, err)
 
 			if *updateExpected {
-				var results interface{}
+				var results any
 				err := json.Unmarshal(contents, &results)
 				require.NoError(t, err)
 

pkg/api/handler_tcp.go

@@ -16,6 +16,7 @@ import (
 
 type tcpRouterRepresentation struct {
 	*runtime.TCPRouterInfo
+
 	Name     string `json:"name,omitempty"`
 	Provider string `json:"provider,omitempty"`
 }
@@ -30,6 +31,7 @@ func newTCPRouterRepresentation(name string, rt *runtime.TCPRouterInfo) tcpRoute
 
 type tcpServiceRepresentation struct {
 	*runtime.TCPServiceInfo
+
 	Name     string `json:"name,omitempty"`
 	Provider string `json:"provider,omitempty"`
 	Type     string `json:"type,omitempty"`
@@ -46,6 +48,7 @@ func newTCPServiceRepresentation(name string, si *runtime.TCPServiceInfo) tcpSer
 
 type tcpMiddlewareRepresentation struct {
 	*runtime.TCPMiddlewareInfo
+
 	Name     string `json:"name,omitempty"`
 	Provider string `json:"provider,omitempty"`
 	Type     string `json:"type,omitempty"`

pkg/api/handler_tcp_test.go

@@ -821,7 +821,7 @@ func TestHandler_TCP(t *testing.T) {
 			require.NoError(t, err)
 
 			if *updateExpected {
-				var results interface{}
+				var results any
 				err := json.Unmarshal(contents, &results)
 				require.NoError(t, err)
 

pkg/api/handler_test.go

@@ -178,7 +178,7 @@ func TestHandler_GetMiddleware(t *testing.T) {
 		middlewareName string
 		conf           runtime.Configuration
 		expectedStatus int
-		expected       interface{}
+		expected       any
 	}{
 		{
 			desc:           "Middleware not found",

pkg/api/handler_udp.go

@@ -16,6 +16,7 @@ import (
 
 type udpRouterRepresentation struct {
 	*runtime.UDPRouterInfo
+
 	Name     string `json:"name,omitempty"`
 	Provider string `json:"provider,omitempty"`
 }
@@ -30,6 +31,7 @@ func newUDPRouterRepresentation(name string, rt *runtime.UDPRouterInfo) udpRoute
 
 type udpServiceRepresentation struct {
 	*runtime.UDPServiceInfo
+
 	Name     string `json:"name,omitempty"`
 	Provider string `json:"provider,omitempty"`
 	Type     string `json:"type,omitempty"`

pkg/api/handler_udp_test.go

@@ -560,7 +560,7 @@ func TestHandler_UDP(t *testing.T) {
 			require.NoError(t, err)
 
 			if *updateExpected {
-				var results interface{}
+				var results any
 				err := json.Unmarshal(contents, &results)
 				require.NoError(t, err)
 

pkg/cli/loader_file.go

@@ -63,7 +63,7 @@ func (f *FileLoader) Load(args []string, cmd *cli.Command) (bool, error) {
 
 // loadConfigFiles tries to decode the given configuration file and all default locations for the configuration file.
 // It stops as soon as decoding one of them is successful.
-func loadConfigFiles(configFile string, element interface{}) (string, error) {
+func loadConfigFiles(configFile string, element any) (string, error) {
 	finder := cli.Finder{
 		BasePaths:  []string{"/etc/traefik/traefik", "$XDG_CONFIG_HOME/traefik", "$HOME/.config/traefik", "./traefik"},
 		Extensions: []string{"toml", "yaml", "yml"},

pkg/collector/hydratation/hydration.go

@@ -18,7 +18,7 @@ const (
 )
 
 // Hydrate hydrates a configuration.
-func Hydrate(element interface{}) error {
+func Hydrate(element any) error {
 	field := reflect.ValueOf(element)
 	return fill(field)
 }
@@ -55,7 +55,7 @@ func fill(field reflect.Value) error {
 		setTyped(field, int32(defaultNumber))
 	case reflect.Int64:
 		switch field.Type() {
-		case reflect.TypeOf(types.Duration(time.Second)):
+		case reflect.TypeFor[types.Duration]():
 			setTyped(field, types.Duration(defaultNumber*time.Second))
 		default:
 			setTyped(field, int64(defaultNumber))
@@ -81,7 +81,7 @@ func fill(field reflect.Value) error {
 	return nil
 }
 
-func setTyped(field reflect.Value, i interface{}) {
+func setTyped(field reflect.Value, i any) {
 	baseValue := reflect.ValueOf(i)
 	if field.Kind().String() == field.Type().String() {
 		field.Set(baseValue)

pkg/config/dynamic/config_test.go

@@ -21,7 +21,7 @@ func TestDeepCopy(t *testing.T) {
 
 	cfgDeepCopy := cfg.DeepCopy()
 	assert.NotEqual(t, reflect.ValueOf(cfgDeepCopy), reflect.ValueOf(cfg))
-	assert.Equal(t, reflect.TypeOf(cfgDeepCopy), reflect.TypeOf(cfg))
+	assert.Equal(t, reflect.TypeOf(cfgDeepCopy), reflect.TypeOf(cfg)) //nolint:modernize // Comparing runtime types of two values.
 	assert.Equal(t, cfgDeepCopy, cfg)
 
 	// Update cfg
@@ -32,6 +32,6 @@ func TestDeepCopy(t *testing.T) {
 	assert.Equal(t, cfgCopy, cfg)
 
 	assert.NotEqual(t, reflect.ValueOf(cfgDeepCopy), reflect.ValueOf(cfg))
-	assert.Equal(t, reflect.TypeOf(cfgDeepCopy), reflect.TypeOf(cfg))
+	assert.Equal(t, reflect.TypeOf(cfgDeepCopy), reflect.TypeOf(cfg)) //nolint:modernize // Comparing runtime types of two values.
 	assert.NotEqual(t, cfgDeepCopy, cfg)
 }

pkg/config/dynamic/middlewares.go

@@ -389,6 +389,7 @@ func (s *IPStrategy) Get() (ip.Strategy, error) {
 // IPWhiteList holds the IP whitelist middleware configuration.
 // This middleware limits allowed requests based on the client IP.
 // More info: https://doc.traefik.io/traefik/v2.11/middlewares/http/ipwhitelist/
+//
 // Deprecated: please use IPAllowList instead.
 type IPWhiteList struct {
 	// SourceRange defines the set of allowed IPs (or ranges of allowed IPs by using CIDR notation). Required.

pkg/config/dynamic/plugins_test.go

@@ -44,11 +44,11 @@ func TestPluginConf_DeepCopy_mapOfStruct(t *testing.T) {
 }
 
 func TestPluginConf_DeepCopy_map(t *testing.T) {
-	m := map[string]interface{}{
+	m := map[string]any{
 		"name": "bar",
 	}
 	p := PluginConf{
-		"config": map[string]interface{}{
+		"config": map[string]any{
 			"foo": m,
 		},
 	}
@@ -64,7 +64,7 @@ func TestPluginConf_DeepCopy_map(t *testing.T) {
 
 func TestPluginConf_DeepCopy_panic(t *testing.T) {
 	p := &PluginConf{
-		"config": map[string]interface{}{
+		"config": map[string]any{
 			"foo": &Foo{Name: "gigi"},
 		},
 	}

pkg/config/dynamic/tcp_middlewares.go

@@ -26,6 +26,7 @@ type TCPInFlightConn struct {
 // TCPIPWhiteList holds the TCP IPWhiteList middleware configuration.
 // This middleware limits allowed requests based on the client IP.
 // More info: https://doc.traefik.io/traefik/v2.11/middlewares/tcp/ipwhitelist/
+//
 // Deprecated: please use IPAllowList instead.
 type TCPIPWhiteList struct {
 	// SourceRange defines the allowed IPs (or ranges of allowed IPs by using CIDR notation).

pkg/config/kv/kv.go

@@ -13,7 +13,7 @@ import (
 // KV pairs -> tree of untyped nodes
 // untyped nodes -> nodes augmented with metadata such as kind (inferred from element)
 // "typed" nodes -> typed element.
-func Decode(pairs []*store.KVPair, element interface{}, rootName string) error {
+func Decode(pairs []*store.KVPair, element any, rootName string) error {
 	if element == nil {
 		return nil
 	}
@@ -34,7 +34,7 @@ func Decode(pairs []*store.KVPair, element interface{}, rootName string) error {
 	return parser.Fill(element, node, parser.FillerOpts{AllowSliceAsStruct: false})
 }
 
-func getRootFieldNames(rootName string, element interface{}) []string {
+func getRootFieldNames(rootName string, element any) []string {
 	if element == nil {
 		return nil
 	}

pkg/config/label/label.go

@@ -31,6 +31,6 @@ func EncodeConfiguration(conf *dynamic.Configuration) (map[string]string, error)
 
 // Decode converts the labels to an element.
 // labels -> [ node -> node + metadata (type) ] -> element (node).
-func Decode(labels map[string]string, element interface{}, filters ...string) error {
+func Decode(labels map[string]string, element any, filters ...string) error {
 	return parser.Decode(labels, element, parser.DefaultRootName, filters...)
 }

pkg/config/runtime/runtime_http.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"maps"
 	"slices"
 	"sort"
 	"sync"
@@ -72,6 +73,7 @@ func unique(src []string) []string {
 // RouterInfo holds information about a currently running HTTP router.
 type RouterInfo struct {
 	*dynamic.Router // dynamic configuration
+
 	// Err contains all the errors that occurred during router's creation.
 	Err []string `json:"error,omitempty"`
 	// Status reports whether the router is disabled, in a warning state, or all good (enabled).
@@ -84,11 +86,9 @@ type RouterInfo struct {
 // AddError adds err to r.Err, if it does not already exist.
 // If critical is set, r is marked as disabled.
 func (r *RouterInfo) AddError(err error, critical bool) {
-	for _, value := range r.Err {
-		if value == err.Error() {
+	if slices.Contains(r.Err, err.Error()) {
 		return
 	}
-	}
 
 	r.Err = append(r.Err, err.Error())
 	if critical {
@@ -105,6 +105,7 @@ func (r *RouterInfo) AddError(err error, critical bool) {
 // MiddlewareInfo holds information about a currently running middleware.
 type MiddlewareInfo struct {
 	*dynamic.Middleware // dynamic configuration
+
 	// Err contains all the errors that occurred during service creation.
 	Err    []string `json:"error,omitempty"`
 	Status string   `json:"status,omitempty"`
@@ -114,11 +115,9 @@ type MiddlewareInfo struct {
 // AddError adds err to s.Err, if it does not already exist.
 // If critical is set, m is marked as disabled.
 func (m *MiddlewareInfo) AddError(err error, critical bool) {
-	for _, value := range m.Err {
-		if value == err.Error() {
+	if slices.Contains(m.Err, err.Error()) {
 		return
 	}
-	}
 
 	m.Err = append(m.Err, err.Error())
 	if critical {
@@ -135,6 +134,7 @@ func (m *MiddlewareInfo) AddError(err error, critical bool) {
 // ServiceInfo holds information about a currently running service.
 type ServiceInfo struct {
 	*dynamic.Service // dynamic configuration
+
 	// Err contains all the errors that occurred during service creation.
 	Err []string `json:"error,omitempty"`
 	// Status reports whether the service is disabled, in a warning state, or all good (enabled).
@@ -150,11 +150,9 @@ type ServiceInfo struct {
 // AddError adds err to s.Err, if it does not already exist.
 // If critical is set, s is marked as disabled.
 func (s *ServiceInfo) AddError(err error, critical bool) {
-	for _, value := range s.Err {
-		if value == err.Error() {
+	if slices.Contains(s.Err, err.Error()) {
 		return
 	}
-	}
 
 	s.Err = append(s.Err, err.Error())
 	if critical {
@@ -190,9 +188,5 @@ func (s *ServiceInfo) GetAllStatus() map[string]string {
 		return nil
 	}
 
-	allStatus := make(map[string]string, len(s.serverStatus))
-	for k, v := range s.serverStatus {
-		allStatus[k] = v
-	}
-	return allStatus
+	return maps.Clone(s.serverStatus)
 }

pkg/config/runtime/runtime_tcp.go

@@ -48,6 +48,7 @@ func (c *Configuration) GetTCPRoutersByEntryPoints(ctx context.Context, entryPoi
 // TCPRouterInfo holds information about a currently running TCP router.
 type TCPRouterInfo struct {
 	*dynamic.TCPRouter // dynamic configuration
+
 	Err []string `json:"error,omitempty"` // initialization error
 	// Status reports whether the router is disabled, in a warning state, or all good (enabled).
 	// If not in "enabled" state, the reason for it should be in the list of Err.
@@ -59,11 +60,9 @@ type TCPRouterInfo struct {
 // AddError adds err to r.Err, if it does not already exist.
 // If critical is set, r is marked as disabled.
 func (r *TCPRouterInfo) AddError(err error, critical bool) {
-	for _, value := range r.Err {
-		if value == err.Error() {
+	if slices.Contains(r.Err, err.Error()) {
 		return
 	}
-	}
 
 	r.Err = append(r.Err, err.Error())
 	if critical {
@@ -80,6 +79,7 @@ func (r *TCPRouterInfo) AddError(err error, critical bool) {
 // TCPServiceInfo holds information about a currently running TCP service.
 type TCPServiceInfo struct {
 	*dynamic.TCPService // dynamic configuration
+
 	Err []string `json:"error,omitempty"` // initialization error
 	// Status reports whether the service is disabled, in a warning state, or all good (enabled).
 	// If not in "enabled" state, the reason for it should be in the list of Err.
@@ -91,11 +91,9 @@ type TCPServiceInfo struct {
 // AddError adds err to s.Err, if it does not already exist.
 // If critical is set, s is marked as disabled.
 func (s *TCPServiceInfo) AddError(err error, critical bool) {
-	for _, value := range s.Err {
-		if value == err.Error() {
+	if slices.Contains(s.Err, err.Error()) {
 		return
 	}
-	}
 
 	s.Err = append(s.Err, err.Error())
 	if critical {
@@ -112,6 +110,7 @@ func (s *TCPServiceInfo) AddError(err error, critical bool) {
 // TCPMiddlewareInfo holds information about a currently running middleware.
 type TCPMiddlewareInfo struct {
 	*dynamic.TCPMiddleware // dynamic configuration
+
 	// Err contains all the errors that occurred during service creation.
 	Err    []string `json:"error,omitempty"`
 	Status string   `json:"status,omitempty"`
@@ -121,11 +120,9 @@ type TCPMiddlewareInfo struct {
 // AddError adds err to s.Err, if it does not already exist.
 // If critical is set, m is marked as disabled.
 func (m *TCPMiddlewareInfo) AddError(err error, critical bool) {
-	for _, value := range m.Err {
-		if value == err.Error() {
+	if slices.Contains(m.Err, err.Error()) {
 		return
 	}
-	}
 
 	m.Err = append(m.Err, err.Error())
 	if critical {

pkg/config/runtime/runtime_udp.go

@@ -54,6 +54,7 @@ func (c *Configuration) GetUDPRoutersByEntryPoints(ctx context.Context, entryPoi
 // UDPRouterInfo holds information about a currently running UDP router.
 type UDPRouterInfo struct {
 	*dynamic.UDPRouter // dynamic configuration
+
 	Err []string `json:"error,omitempty"` // initialization error
 	// Status reports whether the router is disabled, in a warning state, or all good (enabled).
 	// If not in "enabled" state, the reason for it should be in the list of Err.
@@ -65,11 +66,9 @@ type UDPRouterInfo struct {
 // AddError adds err to r.Err, if it does not already exist.
 // If critical is set, r is marked as disabled.
 func (r *UDPRouterInfo) AddError(err error, critical bool) {
-	for _, value := range r.Err {
-		if value == err.Error() {
+	if slices.Contains(r.Err, err.Error()) {
 		return
 	}
-	}
 
 	r.Err = append(r.Err, err.Error())
 	if critical {
@@ -86,6 +85,7 @@ func (r *UDPRouterInfo) AddError(err error, critical bool) {
 // UDPServiceInfo holds information about a currently running UDP service.
 type UDPServiceInfo struct {
 	*dynamic.UDPService // dynamic configuration
+
 	Err []string `json:"error,omitempty"` // initialization error
 	// Status reports whether the service is disabled, in a warning state, or all good (enabled).
 	// If not in "enabled" state, the reason for it should be in the list of Err.
@@ -97,11 +97,9 @@ type UDPServiceInfo struct {
 // AddError adds err to s.Err, if it does not already exist.
 // If critical is set, s is marked as disabled.
 func (s *UDPServiceInfo) AddError(err error, critical bool) {
-	for _, value := range s.Err {
-		if value == err.Error() {
+	if slices.Contains(s.Err, err.Error()) {
 		return
 	}
-	}
 
 	s.Err = append(s.Err, err.Error())
 	if critical {

pkg/config/static/plugins.go

@@ -1,4 +1,4 @@
 package static
 
 // PluginConf holds the plugin configuration.
-type PluginConf map[string]interface{}
+type PluginConf map[string]any

pkg/config/static/static_config.go

@@ -295,20 +295,6 @@ func (c *Configuration) SetEffectiveConfiguration() {
 	c.initACMEProvider()
 }
 
-func (c *Configuration) hasUserDefinedEntrypoint() bool {
-	return len(c.EntryPoints) != 0
-}
-
-func (c *Configuration) initACMEProvider() {
-	for _, resolver := range c.CertificatesResolvers {
-		if resolver.ACME != nil {
-			resolver.ACME.CAServer = getSafeACMECAServer(resolver.ACME.CAServer)
-		}
-	}
-
-	legolog.Logger = stdlog.New(log.WithoutContext().WriterLevel(logrus.DebugLevel), "legolog: ", 0)
-}
-
 // ValidateConfiguration validate that configuration is coherent.
 func (c *Configuration) ValidateConfiguration() error {
 	var acmeEmail string
@@ -342,6 +328,20 @@ func (c *Configuration) ValidateConfiguration() error {
 	return nil
 }
 
+func (c *Configuration) hasUserDefinedEntrypoint() bool {
+	return len(c.EntryPoints) != 0
+}
+
+func (c *Configuration) initACMEProvider() {
+	for _, resolver := range c.CertificatesResolvers {
+		if resolver.ACME != nil {
+			resolver.ACME.CAServer = getSafeACMECAServer(resolver.ACME.CAServer)
+		}
+	}
+
+	legolog.Logger = stdlog.New(log.WithoutContext().WriterLevel(logrus.DebugLevel), "legolog: ", 0)
+}
+
 func getSafeACMECAServer(caServerSrc string) string {
 	if len(caServerSrc) == 0 {
 		return DefaultAcmeCAServer

pkg/healthcheck/healthcheck.go

@@ -82,10 +82,19 @@ type backendURL struct {
 // BackendConfig HealthCheck configuration for a backend.
 type BackendConfig struct {
 	Options
+
 	name         string
 	disabledURLs []backendURL
 }
 
+// NewBackendConfig Instantiate a new BackendConfig.
+func NewBackendConfig(options Options, backendName string) *BackendConfig {
+	return &BackendConfig{
+		Options: options,
+		name:    backendName,
+	}
+}
+
 func (b *BackendConfig) newRequest(serverURL *url.URL) (*http.Request, error) {
 	u, err := serverURL.Parse(b.Path)
 	if err != nil {
@@ -236,14 +245,6 @@ func newHealthCheck(registry metrics.Registry) *HealthCheck {
 	}
 }
 
-// NewBackendConfig Instantiate a new BackendConfig.
-func NewBackendConfig(options Options, backendName string) *BackendConfig {
-	return &BackendConfig{
-		Options: options,
-		name:    backendName,
-	}
-}
-
 // checkHealth returns a nil error in case it was successful and otherwise
 // a non-nil error with a meaningful description why the health check failed.
 func checkHealth(serverURL *url.URL, backend *BackendConfig) error {
@@ -286,6 +287,16 @@ type StatusUpdater interface {
 	RegisterStatusUpdater(fn func(up bool)) error
 }
 
+// LbStatusUpdater wraps a BalancerHandler and a ServiceInfo,
+// so it can keep track of the status of a server in the ServiceInfo.
+type LbStatusUpdater struct {
+	BalancerHandler
+
+	serviceInfo      *runtime.ServiceInfo // can be nil
+	updaters         []func(up bool)
+	wantsHealthCheck bool
+}
+
 // NewLBStatusUpdater returns a new LbStatusUpdater.
 func NewLBStatusUpdater(bh BalancerHandler, info *runtime.ServiceInfo, hc *dynamic.ServerHealthCheck) *LbStatusUpdater {
 	return &LbStatusUpdater{
@@ -295,15 +306,6 @@ func NewLBStatusUpdater(bh BalancerHandler, info *runtime.ServiceInfo, hc *dynam
 	}
 }
 
-// LbStatusUpdater wraps a BalancerHandler and a ServiceInfo,
-// so it can keep track of the status of a server in the ServiceInfo.
-type LbStatusUpdater struct {
-	BalancerHandler
-	serviceInfo      *runtime.ServiceInfo // can be nil
-	updaters         []func(up bool)
-	wantsHealthCheck bool
-}
-
 // RegisterStatusUpdater adds fn to the list of hooks that are run when the
 // status of the Balancer changes.
 // Not thread safe.

pkg/healthcheck/healthcheck_test.go

@@ -456,6 +456,7 @@ type testLoadBalancer struct {
 	// RWMutex needed due to parallel test execution: Both the system-under-test
 	// and the test assertions reference the counters.
 	*sync.RWMutex
+
 	numRemovedServers  int
 	numUpsertedServers int
 	servers            []*url.URL

pkg/job/job.go

@@ -17,6 +17,7 @@ const (
 // If operation() takes more than MinJobInterval, Reset() is called in NextBackOff().
 type BackOff struct {
 	*backoff.ExponentialBackOff
+
 	MinJobInterval time.Duration
 }
 

pkg/log/deprecated.go

@@ -9,68 +9,79 @@ import (
 )
 
 // Debug logs a message at level Debug on the standard logger.
+//
 // Deprecated: use log.FromContext(ctx).Debug(...) instead.
-func Debug(args ...interface{}) {
+func Debug(args ...any) {
 	mainLogger.Debug(args...)
 }
 
 // Debugf logs a message at level Debug on the standard logger.
+//
 // Deprecated: use log.FromContext(ctx).Debugf(...) instead.
-func Debugf(format string, args ...interface{}) {
+func Debugf(format string, args ...any) {
 	mainLogger.Debugf(format, args...)
 }
 
 // Info logs a message at level Info on the standard logger.
+//
 // Deprecated: use log.FromContext(ctx).Info(...) instead.
-func Info(args ...interface{}) {
+func Info(args ...any) {
 	mainLogger.Info(args...)
 }
 
 // Infof logs a message at level Info on the standard logger.
+//
 // Deprecated: use log.FromContext(ctx).Infof(...) instead.
-func Infof(format string, args ...interface{}) {
+func Infof(format string, args ...any) {
 	mainLogger.Infof(format, args...)
 }
 
 // Warn logs a message at level Warn on the standard logger.
+//
 // Deprecated: use log.FromContext(ctx).Warn(...) instead.
-func Warn(args ...interface{}) {
+func Warn(args ...any) {
 	mainLogger.Warn(args...)
 }
 
 // Warnf logs a message at level Warn on the standard logger.
+//
 // Deprecated: use log.FromContext(ctx).Warnf(...) instead.
-func Warnf(format string, args ...interface{}) {
+func Warnf(format string, args ...any) {
 	mainLogger.Warnf(format, args...)
 }
 
 // Error logs a message at level Error on the standard logger.
+//
 // Deprecated: use log.FromContext(ctx).Error(...) instead.
-func Error(args ...interface{}) {
+func Error(args ...any) {
 	mainLogger.Error(args...)
 }
 
 // Errorf logs a message at level Error on the standard logger.
+//
 // Deprecated: use log.FromContext(ctx).Errorf(...) instead.
-func Errorf(format string, args ...interface{}) {
+func Errorf(format string, args ...any) {
 	mainLogger.Errorf(format, args...)
 }
 
 // Panic logs a message at level Panic on the standard logger.
+//
 // Deprecated: use log.FromContext(ctx).Panic(...) instead.
-func Panic(args ...interface{}) {
+func Panic(args ...any) {
 	mainLogger.Panic(args...)
 }
 
 // Fatal logs a message at level Fatal on the standard logger.
+//
 // Deprecated: use log.FromContext(ctx).Fatal(...) instead.
-func Fatal(args ...interface{}) {
+func Fatal(args ...any) {
 	mainLogger.Fatal(args...)
 }
 
 // Fatalf logs a message at level Fatal on the standard logger.
+//
 // Deprecated: use log.FromContext(ctx).Fatalf(...) instead.
-func Fatalf(format string, args ...interface{}) {
+func Fatalf(format string, args ...any) {
 	mainLogger.Fatalf(format, args...)
 }
 
@@ -84,7 +95,7 @@ func AddHook(hook logrus.Hook) {
 func CustomWriterLevel(level logrus.Level, maxScanTokenSize int) *io.PipeWriter {
 	reader, writer := io.Pipe()
 
-	var printFunc func(args ...interface{})
+	var printFunc func(args ...any)
 
 	switch level {
 	case logrus.DebugLevel:
@@ -111,7 +122,7 @@ func CustomWriterLevel(level logrus.Level, maxScanTokenSize int) *io.PipeWriter
 
 // extract from github.com/Sirupsen/logrus/writer.go
 // Hack the buffer size.
-func writerScanner(reader io.ReadCloser, scanTokenSize int, printFunc func(args ...interface{})) {
+func writerScanner(reader io.ReadCloser, scanTokenSize int, printFunc func(args ...any)) {
 	scanner := bufio.NewScanner(reader)
 
 	if scanTokenSize > bufio.MaxScanTokenSize {

pkg/metrics/datadog.go

@@ -58,7 +58,7 @@ func RegisterDatadog(ctx context.Context, config *types.Datadog) Registry {
 		config.Prefix = defaultMetricsPrefix
 	}
 
-	datadogClient = dogstatsd.New(config.Prefix+".", kitlog.LoggerFunc(func(keyvals ...interface{}) error {
+	datadogClient = dogstatsd.New(config.Prefix+".", kitlog.LoggerFunc(func(keyvals ...any) error {
 		log.WithoutContext().WithField(log.MetricsProviderName, "datadog").Info(keyvals...)
 		return nil
 	}))

pkg/metrics/headers.go

@@ -36,16 +36,16 @@ func (c MultiCounterWithHeaders) With(headers http.Header, labelValues ...string
 	return next
 }
 
-// NewCounterWithNoopHeaders returns a CounterWithNoopHeaders.
-func NewCounterWithNoopHeaders(counter metrics.Counter) CounterWithNoopHeaders {
-	return CounterWithNoopHeaders{counter: counter}
-}
-
 // CounterWithNoopHeaders is a counter that satisfies CounterWithHeaders but ignores the given http.Header.
 type CounterWithNoopHeaders struct {
 	counter metrics.Counter
 }
 
+// NewCounterWithNoopHeaders returns a CounterWithNoopHeaders.
+func NewCounterWithNoopHeaders(counter metrics.Counter) CounterWithNoopHeaders {
+	return CounterWithNoopHeaders{counter: counter}
+}
+
 // Add adds the given delta value to the counter value.
 func (c CounterWithNoopHeaders) Add(delta float64) {
 	c.counter.Add(delta)

pkg/metrics/influxdb.go

@@ -147,7 +147,7 @@ func initInfluxDBClient(ctx context.Context, config *types.InfluxDB) *influx.Inf
 			Database:        config.Database,
 			RetentionPolicy: config.RetentionPolicy,
 		},
-		kitlog.LoggerFunc(func(keyvals ...interface{}) error {
+		kitlog.LoggerFunc(func(keyvals ...any) error {
 			log.WithoutContext().WithField(log.MetricsProviderName, "influxdb").Info(keyvals...)
 			return nil
 		}))

pkg/metrics/influxdb2.go

@@ -37,7 +37,7 @@ func RegisterInfluxDB2(ctx context.Context, config *types.InfluxDB2) Registry {
 		influxDB2Store = influx.New(
 			config.AdditionalLabels,
 			influxdb.BatchPointsConfig{},
-			kitlog.LoggerFunc(func(kv ...interface{}) error {
+			kitlog.LoggerFunc(func(kv ...any) error {
 				log.FromContext(ctx).Error(kv...)
 				return nil
 			}),

pkg/metrics/statsd.go

@@ -55,7 +55,7 @@ func RegisterStatsd(ctx context.Context, config *types.Statsd) Registry {
 		config.Prefix = defaultMetricsPrefix
 	}
 
-	statsdClient = statsd.New(config.Prefix+".", kitlog.LoggerFunc(func(keyvals ...interface{}) error {
+	statsdClient = statsd.New(config.Prefix+".", kitlog.LoggerFunc(func(keyvals ...any) error {
 		log.WithoutContext().WithField(log.MetricsProviderName, "statsd").Info(keyvals...)
 		return nil
 	}))

pkg/middlewares/accesslog/logdata.go

@@ -121,7 +121,7 @@ func init() {
 }
 
 // CoreLogData holds the fields computed from the request/response.
-type CoreLogData map[string]interface{}
+type CoreLogData map[string]any
 
 // LogData is the data captured by the middleware so that it can be logged.
 type LogData struct {

pkg/middlewares/accesslog/logger_formatters.go

@@ -52,7 +52,7 @@ func (f *CommonLogFormatter) Format(entry *logrus.Entry) ([]byte, error) {
 	return b.Bytes(), err
 }
 
-func toLog(fields logrus.Fields, key, defaultValue string, quoted bool) interface{} {
+func toLog(fields logrus.Fields, key, defaultValue string, quoted bool) any {
 	if v, ok := fields[key]; ok {
 		if v == nil {
 			return defaultValue

pkg/middlewares/accesslog/logger_formatters_test.go

@@ -14,12 +14,12 @@ func TestCommonLogFormatter_Format(t *testing.T) {
 
 	testCases := []struct {
 		name        string
-		data        map[string]interface{}
+		data        map[string]any
 		expectedLog string
 	}{
 		{
 			name: "DownstreamStatus & DownstreamContentSize are nil",
-			data: map[string]interface{}{
+			data: map[string]any{
 				StartUTC:               time.Date(2009, time.November, 10, 23, 0, 0, 0, time.UTC),
 				Duration:               123 * time.Second,
 				ClientHost:             "10.0.0.1",
@@ -40,7 +40,7 @@ func TestCommonLogFormatter_Format(t *testing.T) {
 		},
 		{
 			name: "all data",
-			data: map[string]interface{}{
+			data: map[string]any{
 				StartUTC:               time.Date(2009, time.November, 10, 23, 0, 0, 0, time.UTC),
 				Duration:               123 * time.Second,
 				ClientHost:             "10.0.0.1",
@@ -61,7 +61,7 @@ func TestCommonLogFormatter_Format(t *testing.T) {
 		},
 		{
 			name: "all data with local time",
-			data: map[string]interface{}{
+			data: map[string]any{
 				StartLocal:             time.Date(2009, time.November, 10, 23, 0, 0, 0, time.UTC),
 				Duration:               123 * time.Second,
 				ClientHost:             "10.0.0.1",
@@ -106,7 +106,7 @@ func Test_toLog(t *testing.T) {
 		fieldName    string
 		defaultValue string
 		quoted       bool
-		expectedLog  interface{}
+		expectedLog  any
 	}{
 		{
 			desc: "Should return int 1",

pkg/middlewares/accesslog/logger_test.go

@@ -116,7 +116,7 @@ func lineCount(t *testing.T, fileName string) int {
 	}
 
 	count := 0
-	for _, line := range strings.Split(string(fileContents), "\n") {
+	for line := range strings.SplitSeq(string(fileContents), "\n") {
 		if strings.TrimSpace(line) == "" {
 			continue
 		}
@@ -259,32 +259,32 @@ func TestLoggerCLFWithBufferingSize(t *testing.T) {
 	assertValidLogData(t, expectedLog, logData)
 }
 
-func assertString(exp string) func(t *testing.T, actual interface{}) {
-	return func(t *testing.T, actual interface{}) {
+func assertString(exp string) func(t *testing.T, actual any) {
+	return func(t *testing.T, actual any) {
 		t.Helper()
 
 		assert.Equal(t, exp, actual)
 	}
 }
 
-func assertNotEmpty() func(t *testing.T, actual interface{}) {
-	return func(t *testing.T, actual interface{}) {
+func assertNotEmpty() func(t *testing.T, actual any) {
+	return func(t *testing.T, actual any) {
 		t.Helper()
 
 		assert.NotEmpty(t, actual)
 	}
 }
 
-func assertFloat64(exp float64) func(t *testing.T, actual interface{}) {
-	return func(t *testing.T, actual interface{}) {
+func assertFloat64(exp float64) func(t *testing.T, actual any) {
+	return func(t *testing.T, actual any) {
 		t.Helper()
 
 		assert.InDelta(t, exp, actual, delta)
 	}
 }
 
-func assertFloat64NotZero() func(t *testing.T, actual interface{}) {
-	return func(t *testing.T, actual interface{}) {
+func assertFloat64NotZero() func(t *testing.T, actual any) {
+	return func(t *testing.T, actual any) {
 		t.Helper()
 
 		assert.NotZero(t, actual)
@@ -296,7 +296,7 @@ func TestLoggerJSON(t *testing.T) {
 		desc     string
 		config   *types.AccessLog
 		tls      bool
-		expected map[string]func(t *testing.T, value interface{})
+		expected map[string]func(t *testing.T, value any)
 	}{
 		{
 			desc: "default config",
@@ -304,7 +304,7 @@ func TestLoggerJSON(t *testing.T) {
 				FilePath: "",
 				Format:   JSONFormat,
 			},
-			expected: map[string]func(t *testing.T, value interface{}){
+			expected: map[string]func(t *testing.T, value any){
 				RequestContentSize:        assertFloat64(0),
 				RequestHost:               assertString(testHostname),
 				RequestAddr:               assertString(testHostname),
@@ -344,7 +344,7 @@ func TestLoggerJSON(t *testing.T) {
 				Format:   JSONFormat,
 			},
 			tls: true,
-			expected: map[string]func(t *testing.T, value interface{}){
+			expected: map[string]func(t *testing.T, value any){
 				RequestContentSize:        assertFloat64(0),
 				RequestHost:               assertString(testHostname),
 				RequestAddr:               assertString(testHostname),
@@ -388,7 +388,7 @@ func TestLoggerJSON(t *testing.T) {
 					DefaultMode: "drop",
 				},
 			},
-			expected: map[string]func(t *testing.T, value interface{}){
+			expected: map[string]func(t *testing.T, value any){
 				"level":                   assertString("info"),
 				"msg":                     assertString(""),
 				"time":                    assertNotEmpty(),
@@ -409,7 +409,7 @@ func TestLoggerJSON(t *testing.T) {
 					},
 				},
 			},
-			expected: map[string]func(t *testing.T, value interface{}){
+			expected: map[string]func(t *testing.T, value any){
 				"level": assertString("info"),
 				"msg":   assertString(""),
 				"time":  assertNotEmpty(),
@@ -427,7 +427,7 @@ func TestLoggerJSON(t *testing.T) {
 					},
 				},
 			},
-			expected: map[string]func(t *testing.T, value interface{}){
+			expected: map[string]func(t *testing.T, value any){
 				"level":                   assertString("info"),
 				"msg":                     assertString(""),
 				"time":                    assertNotEmpty(),
@@ -454,7 +454,7 @@ func TestLoggerJSON(t *testing.T) {
 					},
 				},
 			},
-			expected: map[string]func(t *testing.T, value interface{}){
+			expected: map[string]func(t *testing.T, value any){
 				RequestHost:          assertString(testHostname),
 				"level":              assertString("info"),
 				"msg":                assertString(""),
@@ -480,7 +480,7 @@ func TestLoggerJSON(t *testing.T) {
 					},
 				},
 			},
-			expected: map[string]func(t *testing.T, value interface{}){
+			expected: map[string]func(t *testing.T, value any){
 				RequestHost:          assertString(testHostname),
 				"level":              assertString("info"),
 				"msg":                assertString(""),
@@ -506,7 +506,7 @@ func TestLoggerJSON(t *testing.T) {
 			logData, err := os.ReadFile(logFilePath)
 			require.NoError(t, err)
 
-			jsonData := make(map[string]interface{})
+			jsonData := make(map[string]any)
 			err = json.Unmarshal(logData, &jsonData)
 			require.NoError(t, err)
 
@@ -520,7 +520,7 @@ func TestLoggerJSON(t *testing.T) {
 }
 
 func TestLogger_AbortedRequest(t *testing.T) {
-	expected := map[string]func(t *testing.T, value interface{}){
+	expected := map[string]func(t *testing.T, value any){
 		RequestContentSize:             assertFloat64(0),
 		RequestHost:                    assertString(testHostname),
 		RequestAddr:                    assertString(testHostname),
@@ -563,7 +563,7 @@ func TestLogger_AbortedRequest(t *testing.T) {
 	logData, err := os.ReadFile(config.FilePath)
 	require.NoError(t, err)
 
-	jsonData := make(map[string]interface{})
+	jsonData := make(map[string]any)
 	err = json.Unmarshal(logData, &jsonData)
 	require.NoError(t, err)
 

pkg/middlewares/auth/connectionheader.go

@@ -22,7 +22,7 @@ func RemoveConnectionHeaders(req *http.Request) {
 	}
 
 	for _, f := range req.Header[connectionHeader] {
-		for _, sf := range strings.Split(f, ",") {
+		for sf := range strings.SplitSeq(f, ",") {
 			if sf = textproto.TrimString(sf); sf != "" {
 				req.Header.Del(sf)
 			}

pkg/middlewares/capture/capture.go

@@ -84,20 +84,6 @@ func (c *Capture) Reset(next http.Handler) http.Handler {
 	})
 }
 
-func (c *Capture) renew(rw http.ResponseWriter, req *http.Request) (http.ResponseWriter, *http.Request) {
-	ctx := context.WithValue(req.Context(), capturedData, c)
-	newReq := req.WithContext(ctx)
-
-	if newReq.Body != nil {
-		readCounter := &readCounter{source: newReq.Body}
-		c.rr = readCounter
-		newReq.Body = readCounter
-	}
-	c.rw = newResponseWriter(rw)
-
-	return c.rw, newReq
-}
-
 func (c *Capture) ResponseSize() int64 {
 	return c.rw.Size()
 }
@@ -115,6 +101,20 @@ func (c *Capture) RequestSize() int64 {
 	return c.rr.size
 }
 
+func (c *Capture) renew(rw http.ResponseWriter, req *http.Request) (http.ResponseWriter, *http.Request) {
+	ctx := context.WithValue(req.Context(), capturedData, c)
+	newReq := req.WithContext(ctx)
+
+	if newReq.Body != nil {
+		readCounter := &readCounter{source: newReq.Body}
+		c.rr = readCounter
+		newReq.Body = readCounter
+	}
+	c.rw = newResponseWriter(rw)
+
+	return c.rw, newReq
+}
+
 type readCounter struct {
 	// source ReadCloser from where the request body is read.
 	source io.ReadCloser

pkg/middlewares/customerrors/custom_errors.go

@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"context"
 	"fmt"
+	"maps"
 	"net"
 	"net/http"
 	"net/url"
@@ -169,16 +170,6 @@ func (cc *codeCatcher) Header() http.Header {
 	return cc.headerMap
 }
 
-func (cc *codeCatcher) getCode() int {
-	return cc.code
-}
-
-// isFilteredCode returns whether the codeCatcher received a response code among the ones it is watching,
-// and for which the response should be deferred to the error handler.
-func (cc *codeCatcher) isFilteredCode() bool {
-	return cc.caughtFilteredCode
-}
-
 func (cc *codeCatcher) Write(buf []byte) (int, error) {
 	// If WriteHeader was already called from the caller, this is a NOOP.
 	// Otherwise, cc.code is actually a 200 here.
@@ -204,9 +195,7 @@ func (cc *codeCatcher) WriteHeader(code int) {
 	if code >= 100 && code <= 199 {
 		// Multiple informational status codes can be used,
 		// so here the copy is not appending the values to not repeat them.
-		for k, v := range cc.Header() {
-			cc.responseWriter.Header()[k] = v
-		}
+		maps.Copy(cc.responseWriter.Header(), cc.Header())
 
 		cc.responseWriter.WriteHeader(code)
 		return
@@ -224,9 +213,8 @@ func (cc *codeCatcher) WriteHeader(code int) {
 
 	// The copy is not appending the values,
 	// to not repeat them in case any informational status code has been written.
-	for k, v := range cc.Header() {
-		cc.responseWriter.Header()[k] = v
-	}
+	maps.Copy(cc.responseWriter.Header(), cc.Header())
+
 	cc.responseWriter.WriteHeader(cc.code)
 	cc.headersSent = true
 }
@@ -259,6 +247,16 @@ func (cc *codeCatcher) Flush() {
 	}
 }
 
+func (cc *codeCatcher) getCode() int {
+	return cc.code
+}
+
+// isFilteredCode returns whether the codeCatcher received a response code among the ones it is watching,
+// and for which the response should be deferred to the error handler.
+func (cc *codeCatcher) isFilteredCode() bool {
+	return cc.caughtFilteredCode
+}
+
 type codeCatcherWithCloseNotify struct {
 	*codeCatcher
 }
@@ -332,17 +330,14 @@ func (r *codeModifierWithoutCloseNotify) WriteHeader(code int) {
 	if code >= 100 && code <= 199 {
 		// Multiple informational status codes can be used,
 		// so here the copy is not appending the values to not repeat them.
-		for k, v := range r.headerMap {
-			r.responseWriter.Header()[k] = v
-		}
+		maps.Copy(r.responseWriter.Header(), r.headerMap)
 
 		r.responseWriter.WriteHeader(code)
 		return
 	}
 
-	for k, v := range r.headerMap {
-		r.responseWriter.Header()[k] = v
-	}
+	maps.Copy(r.responseWriter.Header(), r.headerMap)
+
 	r.responseWriter.WriteHeader(r.code)
 	r.headerSent = true
 }

pkg/middlewares/forwardedheaders/forwarded_header.go

@@ -81,13 +81,6 @@ func NewXForwarded(insecure bool, trustedIPs []string, connectionHeaders []strin
 	}, nil
 }
 
-func (x *XForwarded) isTrustedIP(ip string) bool {
-	if x.ipChecker == nil {
-		return false
-	}
-	return x.ipChecker.IsAuthorized(ip) == nil
-}
-
 // removeIPv6Zone removes the zone if the given IP is an ipv6 address and it has {zone} information in it,
 // like "[fe80::d806:a55d:eb1b:49cc%vEthernet (vmxnet3 Ethernet Adapter - Virtual Switch)]:64692".
 func removeIPv6Zone(clientIP string) string {
@@ -138,6 +131,28 @@ func forwardedPort(req *http.Request) string {
 	return "80"
 }
 
+// ServeHTTP implements http.Handler.
+func (x *XForwarded) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if !x.insecure && !x.isTrustedIP(r.RemoteAddr) {
+		for _, h := range xHeaders {
+			unsafeHeader(r.Header).Del(h)
+		}
+	}
+
+	x.rewrite(r)
+
+	x.removeConnectionHeaders(r)
+
+	x.next.ServeHTTP(w, r)
+}
+
+func (x *XForwarded) isTrustedIP(ip string) bool {
+	if x.ipChecker == nil {
+		return false
+	}
+	return x.ipChecker.IsAuthorized(ip) == nil
+}
+
 func (x *XForwarded) rewrite(outreq *http.Request) {
 	if clientIP, _, err := net.SplitHostPort(outreq.RemoteAddr); err == nil {
 		clientIP = removeIPv6Zone(clientIP)
@@ -186,21 +201,6 @@ func (x *XForwarded) rewrite(outreq *http.Request) {
 	}
 }
 
-// ServeHTTP implements http.Handler.
-func (x *XForwarded) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	if !x.insecure && !x.isTrustedIP(r.RemoteAddr) {
-		for _, h := range xHeaders {
-			unsafeHeader(r.Header).Del(h)
-		}
-	}
-
-	x.rewrite(r)
-
-	x.removeConnectionHeaders(r)
-
-	x.next.ServeHTTP(w, r)
-}
-
 func (x *XForwarded) removeConnectionHeaders(req *http.Request) {
 	var reqUpType string
 	if httpguts.HeaderValuesContainsToken(req.Header[connection], upgrade) {
@@ -209,7 +209,7 @@ func (x *XForwarded) removeConnectionHeaders(req *http.Request) {
 
 	var connectionHopByHopHeaders []string
 	for _, f := range req.Header[connection] {
-		for _, sf := range strings.Split(f, ",") {
+		for sf := range strings.SplitSeq(f, ",") {
 			if sf = textproto.TrimString(sf); sf != "" {
 				// Connection header cannot dictate to remove X- headers managed by Traefik,
 				// as per rfc7230 https://datatracker.ietf.org/doc/html/rfc7230#section-6.1,

pkg/middlewares/headers/header.go

@@ -68,27 +68,6 @@ func (s *Header) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
 	}
 }
 
-// modifyCustomRequestHeaders sets or deletes custom request headers.
-func (s *Header) modifyCustomRequestHeaders(req *http.Request) {
-	// Loop through Custom request headers
-	for header, value := range s.headers.CustomRequestHeaders {
-		switch {
-		// Handling https://github.com/golang/go/commit/ecdbffd4ec68b509998792f120868fec319de59b.
-		case value == "" && header == forward.XForwardedFor:
-			req.Header[header] = nil
-
-		case value == "":
-			req.Header.Del(header)
-
-		case strings.EqualFold(header, "Host"):
-			req.Host = value
-
-		default:
-			req.Header.Set(header, value)
-		}
-	}
-}
-
 // PostRequestModifyResponseHeaders set or delete response headers.
 // This method is called AFTER the response is generated from the backend
 // and can merge/override headers from the backend response.
@@ -138,6 +117,27 @@ func (s *Header) PostRequestModifyResponseHeaders(res *http.Response) error {
 	return nil
 }
 
+// modifyCustomRequestHeaders sets or deletes custom request headers.
+func (s *Header) modifyCustomRequestHeaders(req *http.Request) {
+	// Loop through Custom request headers
+	for header, value := range s.headers.CustomRequestHeaders {
+		switch {
+		// Handling https://github.com/golang/go/commit/ecdbffd4ec68b509998792f120868fec319de59b.
+		case value == "" && header == forward.XForwardedFor:
+			req.Header[header] = nil
+
+		case value == "":
+			req.Header.Del(header)
+
+		case strings.EqualFold(header, "Host"):
+			req.Host = value
+
+		default:
+			req.Header.Set(header, value)
+		}
+	}
+}
+
 // processCorsHeaders processes the incoming request,
 // and returns if it is a preflight request.
 // If not a preflight, it handles the preRequestModifyCorsResponseHeaders.

pkg/middlewares/headers/secure_test.go

@@ -18,10 +18,11 @@ func Test_newSecure_sslForceHost(t *testing.T) {
 	}
 
 	testCases := []struct {
+		expected
+
 		desc string
 		host string
 		cfg  dynamic.Headers
-		expected
 	}{
 		{
 			desc: "http should return a 301",

pkg/middlewares/metrics/recorder.go

@@ -27,6 +27,7 @@ func newResponseRecorder(rw http.ResponseWriter) recorder {
 // later analysis.
 type responseRecorder struct {
 	http.ResponseWriter
+
 	statusCode int
 }
 
@@ -40,10 +41,6 @@ func (r *responseRecorderWithCloseNotify) CloseNotify() <-chan bool {
 	return r.ResponseWriter.(http.CloseNotifier).CloseNotify()
 }
 
-func (r *responseRecorder) getCode() int {
-	return r.statusCode
-}
-
 // WriteHeader captures the status code for later retrieval.
 func (r *responseRecorder) WriteHeader(status int) {
 	r.ResponseWriter.WriteHeader(status)
@@ -61,3 +58,7 @@ func (r *responseRecorder) Flush() {
 		f.Flush()
 	}
 }
+
+func (r *responseRecorder) getCode() int {
+	return r.statusCode
+}

pkg/middlewares/ratelimiter/rate_limiter.go

@@ -66,10 +66,7 @@ func New(ctx context.Context, next http.Handler, config dynamic.RateLimit, name
 		return nil, err
 	}
 
-	burst := config.Burst
-	if burst < 1 {
-		burst = 1
-	}
+	burst := max(config.Burst, 1)
 
 	period := time.Duration(config.Period)
 	if period < 0 {

pkg/middlewares/ratelimiter/rate_limiter_test.go

@@ -283,11 +283,8 @@ func TestRateLimit(t *testing.T) {
 			stop := time.Now()
 			elapsed := stop.Sub(start)
 
-			burst := test.config.Burst
-			if burst < 1 {
-				// actual default value
-				burst = 1
-			}
+			// actual default value if burst < 1
+			burst := max(test.config.Burst, 1)
 
 			period := time.Duration(test.config.Period)
 			if period == 0 {

pkg/middlewares/recovery/recovery.go

@@ -57,7 +57,7 @@ func recoverFunc(rw recoveryResponseWriter, r *http.Request) {
 
 // https://github.com/golang/go/blob/a0d6420d8be2ae7164797051ec74fa2a2df466a1/src/net/http/server.go#L1761-L1775
 // https://github.com/golang/go/blob/c33153f7b416c03983324b3e8f869ce1116d84bc/src/net/http/httputil/reverseproxy.go#L284
-func shouldLogPanic(panicValue interface{}) bool {
+func shouldLogPanic(panicValue any) bool {
 	//nolint:errorlint // false-positive because panicValue is an interface.
 	return panicValue != nil && panicValue != http.ErrAbortHandler
 }

pkg/middlewares/retry/retry.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"maps"
 	"math"
 	"net"
 	"net/http"
@@ -239,10 +240,7 @@ func (r *responseWriterWithoutCloseNotify) WriteHeader(code int) {
 	// to write headers to the backend : we are not going to perform any further retry.
 	// So it is now safe to alter current response headers with headers collected during
 	// the latest try before writing headers to client.
-	headers := r.responseWriter.Header()
-	for header, value := range r.headers {
-		headers[header] = value
-	}
+	maps.Copy(r.responseWriter.Header(), r.headers)
 
 	r.responseWriter.WriteHeader(code)
 

pkg/middlewares/tracing/entrypoint.go

@@ -29,6 +29,7 @@ func NewEntryPoint(ctx context.Context, t *tracing.Tracing, entryPointName strin
 
 type entryPointMiddleware struct {
 	*tracing.Tracing
+
 	entryPoint string
 	next       http.Handler
 }

pkg/middlewares/tracing/entrypoint_test.go

@@ -13,7 +13,7 @@ import (
 
 func TestEntryPointMiddleware(t *testing.T) {
 	type expected struct {
-		Tags          map[string]interface{}
+		Tags          map[string]any
 		OperationName string
 	}
 
@@ -29,10 +29,10 @@ func TestEntryPointMiddleware(t *testing.T) {
 			entryPoint:    "test",
 			spanNameLimit: 0,
 			tracing: &trackingBackenMock{
-				tracer: &MockTracer{Span: &MockSpan{Tags: make(map[string]interface{})}},
+				tracer: &MockTracer{Span: &MockSpan{Tags: make(map[string]any)}},
 			},
 			expected: expected{
-				Tags: map[string]interface{}{
+				Tags: map[string]any{
 					"span.kind":   ext.SpanKindRPCServerEnum,
 					"http.method": http.MethodGet,
 					"component":   "",
@@ -47,10 +47,10 @@ func TestEntryPointMiddleware(t *testing.T) {
 			entryPoint:    "test",
 			spanNameLimit: 25,
 			tracing: &trackingBackenMock{
-				tracer: &MockTracer{Span: &MockSpan{Tags: make(map[string]interface{})}},
+				tracer: &MockTracer{Span: &MockSpan{Tags: make(map[string]any)}},
 			},
 			expected: expected{
-				Tags: map[string]interface{}{
+				Tags: map[string]any{
 					"span.kind":   ext.SpanKindRPCServerEnum,
 					"http.method": http.MethodGet,
 					"component":   "",

pkg/middlewares/tracing/forwarder_test.go

@@ -13,7 +13,7 @@ import (
 
 func TestNewForwarder(t *testing.T) {
 	type expected struct {
-		Tags          map[string]interface{}
+		Tags          map[string]any
 		OperationName string
 	}
 
@@ -29,12 +29,12 @@ func TestNewForwarder(t *testing.T) {
 			desc:          "Simple Forward Tracer without truncation and hashing",
 			spanNameLimit: 101,
 			tracing: &trackingBackenMock{
-				tracer: &MockTracer{Span: &MockSpan{Tags: make(map[string]interface{})}},
+				tracer: &MockTracer{Span: &MockSpan{Tags: make(map[string]any)}},
 			},
 			service: "some-service.domain.tld",
 			router:  "some-service.domain.tld",
 			expected: expected{
-				Tags: map[string]interface{}{
+				Tags: map[string]any{
 					"http.host":            "www.test.com",
 					"http.method":          "GET",
 					"http.url":             "http://www.test.com/toto",
@@ -49,12 +49,12 @@ func TestNewForwarder(t *testing.T) {
 			desc:          "Simple Forward Tracer with truncation and hashing",
 			spanNameLimit: 101,
 			tracing: &trackingBackenMock{
-				tracer: &MockTracer{Span: &MockSpan{Tags: make(map[string]interface{})}},
+				tracer: &MockTracer{Span: &MockSpan{Tags: make(map[string]any)}},
 			},
 			service: "some-service-100.slug.namespace.environment.domain.tld",
 			router:  "some-service-100.slug.namespace.environment.domain.tld",
 			expected: expected{
-				Tags: map[string]interface{}{
+				Tags: map[string]any{
 					"http.host":            "www.test.com",
 					"http.method":          "GET",
 					"http.url":             "http://www.test.com/toto",
@@ -69,12 +69,12 @@ func TestNewForwarder(t *testing.T) {
 			desc:          "Exactly 101 chars",
 			spanNameLimit: 101,
 			tracing: &trackingBackenMock{
-				tracer: &MockTracer{Span: &MockSpan{Tags: make(map[string]interface{})}},
+				tracer: &MockTracer{Span: &MockSpan{Tags: make(map[string]any)}},
 			},
 			service: "some-service1.namespace.environment.domain.tld",
 			router:  "some-service1.namespace.environment.domain.tld",
 			expected: expected{
-				Tags: map[string]interface{}{
+				Tags: map[string]any{
 					"http.host":            "www.test.com",
 					"http.method":          "GET",
 					"http.url":             "http://www.test.com/toto",
@@ -89,12 +89,12 @@ func TestNewForwarder(t *testing.T) {
 			desc:          "More than 101 chars",
 			spanNameLimit: 101,
 			tracing: &trackingBackenMock{
-				tracer: &MockTracer{Span: &MockSpan{Tags: make(map[string]interface{})}},
+				tracer: &MockTracer{Span: &MockSpan{Tags: make(map[string]any)}},
 			},
 			service: "some-service1.frontend.namespace.environment.domain.tld",
 			router:  "some-service1.backend.namespace.environment.domain.tld",
 			expected: expected{
-				Tags: map[string]interface{}{
+				Tags: map[string]any{
 					"http.host":            "www.test.com",
 					"http.method":          "GET",
 					"http.url":             "http://www.test.com/toto",

pkg/middlewares/tracing/mock_tracing_test.go

@@ -18,12 +18,12 @@ func (n MockTracer) StartSpan(operationName string, opts ...opentracing.StartSpa
 }
 
 // Inject belongs to the Tracer interface.
-func (n MockTracer) Inject(sp opentracing.SpanContext, format, carrier interface{}) error {
+func (n MockTracer) Inject(sp opentracing.SpanContext, format, carrier any) error {
 	return nil
 }
 
 // Extract belongs to the Tracer interface.
-func (n MockTracer) Extract(format, carrier interface{}) (opentracing.SpanContext, error) {
+func (n MockTracer) Extract(format, carrier any) (opentracing.SpanContext, error) {
 	return nil, opentracing.ErrSpanContextNotFound
 }
 
@@ -35,29 +35,29 @@ func (n MockSpanContext) ForeachBaggageItem(handler func(k, v string) bool) {}
 // MockSpan a span mock.
 type MockSpan struct {
 	OpName string
-	Tags   map[string]interface{}
+	Tags   map[string]any
 }
 
 func (n *MockSpan) Context() opentracing.SpanContext { return MockSpanContext{} }
 func (n *MockSpan) SetBaggageItem(key, val string) opentracing.Span {
-	return &MockSpan{Tags: make(map[string]interface{})}
+	return &MockSpan{Tags: make(map[string]any)}
 }
 func (n *MockSpan) BaggageItem(key string) string { return "" }
-func (n *MockSpan) SetTag(key string, value interface{}) opentracing.Span {
+func (n *MockSpan) SetTag(key string, value any) opentracing.Span {
 	n.Tags[key] = value
 	return n
 }
 func (n *MockSpan) LogFields(fields ...log.Field)                          {}
-func (n *MockSpan) LogKV(keyVals ...interface{})                           {}
+func (n *MockSpan) LogKV(keyVals ...any)                                   {}
 func (n *MockSpan) Finish()                                                {}
 func (n *MockSpan) FinishWithOptions(opts opentracing.FinishOptions)       {}
 func (n *MockSpan) SetOperationName(operationName string) opentracing.Span { return n }
 func (n *MockSpan) Tracer() opentracing.Tracer                             { return MockTracer{} }
 func (n *MockSpan) LogEvent(event string)                                  {}
-func (n *MockSpan) LogEventWithPayload(event string, payload interface{})  {}
+func (n *MockSpan) LogEventWithPayload(event string, payload any)          {}
 func (n *MockSpan) Log(data opentracing.LogData)                           {}
 func (n *MockSpan) Reset() {
-	n.Tags = make(map[string]interface{})
+	n.Tags = make(map[string]any)
 }
 
 type trackingBackenMock struct {

pkg/middlewares/tracing/status_code.go

@@ -22,6 +22,7 @@ func newStatusCodeRecoder(rw http.ResponseWriter, status int) statusCodeRecoder
 
 type statusCodeWithoutCloseNotify struct {
 	http.ResponseWriter
+
 	status int
 }
 

pkg/muxer/http/mux.go

@@ -32,6 +32,7 @@ var httpFuncs = map[string]func(*mux.Route, ...string) error{
 // Muxer handles routing with rules.
 type Muxer struct {
 	*mux.Router
+
 	parser predicate.Parser
 }
 

pkg/plugins/client.go

@@ -245,35 +245,6 @@ func (c *Client) Unzip(pName, pVersion string) error {
 	return c.unzipArchive(pName, pVersion)
 }
 
-func (c *Client) unzipModule(pName, pVersion string) error {
-	src := c.buildArchivePath(pName, pVersion)
-	dest := filepath.Join(c.sources, filepath.FromSlash(pName))
-
-	return zip.Unzip(dest, module.Version{Path: pName, Version: pVersion}, src)
-}
-
-func (c *Client) unzipArchive(pName, pVersion string) error {
-	zipPath := c.buildArchivePath(pName, pVersion)
-
-	archive, err := zipa.OpenReader(zipPath)
-	if err != nil {
-		return err
-	}
-
-	defer func() { _ = archive.Close() }()
-
-	dest := filepath.Join(c.sources, filepath.FromSlash(pName))
-
-	for _, f := range archive.File {
-		err = unzipFile(f, dest)
-		if err != nil {
-			return fmt.Errorf("unable to unzip %s: %w", f.Name, err)
-		}
-	}
-
-	return nil
-}
-
 func unzipFile(f *zipa.File, dest string) error {
 	rc, err := f.Open()
 	if err != nil {
@@ -404,6 +375,35 @@ func (c *Client) ResetAll() error {
 	return nil
 }
 
+func (c *Client) unzipModule(pName, pVersion string) error {
+	src := c.buildArchivePath(pName, pVersion)
+	dest := filepath.Join(c.sources, filepath.FromSlash(pName))
+
+	return zip.Unzip(dest, module.Version{Path: pName, Version: pVersion}, src)
+}
+
+func (c *Client) unzipArchive(pName, pVersion string) error {
+	zipPath := c.buildArchivePath(pName, pVersion)
+
+	archive, err := zipa.OpenReader(zipPath)
+	if err != nil {
+		return err
+	}
+
+	defer func() { _ = archive.Close() }()
+
+	dest := filepath.Join(c.sources, filepath.FromSlash(pName))
+
+	for _, f := range archive.File {
+		err = unzipFile(f, dest)
+		if err != nil {
+			return fmt.Errorf("unable to unzip %s: %w", f.Name, err)
+		}
+	}
+
+	return nil
+}
+
 func (c *Client) buildArchivePath(pName, pVersion string) string {
 	return filepath.Join(c.archives, filepath.FromSlash(pName), pVersion+".zip")
 }

pkg/plugins/middlewares.go

@@ -13,7 +13,7 @@ import (
 )
 
 // Build builds a middleware plugin.
-func (b Builder) Build(pName string, config map[string]interface{}, middlewareName string) (Constructor, error) {
+func (b Builder) Build(pName string, config map[string]any, middlewareName string) (Constructor, error) {
 	if b.middlewareBuilders == nil {
 		return nil, fmt.Errorf("no plugin definition in the static configuration: %s", pName)
 	}
@@ -77,7 +77,7 @@ func (p middlewareBuilder) newHandler(ctx context.Context, next http.Handler, cf
 	return handler, nil
 }
 
-func (p middlewareBuilder) createConfig(config map[string]interface{}) (reflect.Value, error) {
+func (p middlewareBuilder) createConfig(config map[string]any) (reflect.Value, error) {
 	results := p.fnCreateConfig.Call(nil)
 	if len(results) != 1 {
 		return reflect.Value{}, fmt.Errorf("invalid number of return for the CreateConfig function: %d", len(results))
@@ -114,7 +114,7 @@ type Middleware struct {
 	builder        *middlewareBuilder
 }
 
-func newMiddleware(builder *middlewareBuilder, config map[string]interface{}, middlewareName string) (*Middleware, error) {
+func newMiddleware(builder *middlewareBuilder, config map[string]any, middlewareName string) (*Middleware, error) {
 	vConfig, err := builder.createConfig(config)
 	if err != nil {
 		return nil, err

pkg/plugins/providers.go

@@ -24,7 +24,7 @@ type PP interface {
 }
 
 type _PP struct {
-	IValue   interface{}
+	IValue   any
 	WInit    func() error
 	WProvide func(cfgChan chan<- json.Marshaler) error
 	WStop    func() error
@@ -52,7 +52,7 @@ func ppSymbols() map[string]map[string]reflect.Value {
 }
 
 // BuildProvider builds a plugin's provider.
-func (b Builder) BuildProvider(pName string, config map[string]interface{}) (provider.Provider, error) {
+func (b Builder) BuildProvider(pName string, config map[string]any) (provider.Provider, error) {
 	if b.providerBuilders == nil {
 		return nil, fmt.Errorf("no plugin definition in the static configuration: %s", pName)
 	}
@@ -81,7 +81,7 @@ type Provider struct {
 	pp   PP
 }
 
-func newProvider(builder providerBuilder, config map[string]interface{}, providerName string) (*Provider, error) {
+func newProvider(builder providerBuilder, config map[string]any, providerName string) (*Provider, error) {
 	basePkg := builder.BasePkg
 	if basePkg == "" {
 		basePkg = strings.ReplaceAll(path.Base(builder.Import), "-", "_")

pkg/plugins/types.go

@@ -23,5 +23,5 @@ type Manifest struct {
 	BasePkg       string         `yaml:"basePkg"`
 	Compatibility string         `yaml:"compatibility"`
 	Summary       string         `yaml:"summary"`
-	TestData      map[string]interface{} `yaml:"testData"`
+	TestData      map[string]any `yaml:"testData"`
 }

pkg/provider/acme/local_store.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"io"
+	"maps"
 	"os"
 	"sync"
 
@@ -29,6 +30,52 @@ func NewLocalStore(filename string, routinesPool *safe.Pool) *LocalStore {
 	return store
 }
 
+// GetAccount returns ACME Account.
+func (s *LocalStore) GetAccount(resolverName string) (*Account, error) {
+	storedData, err := s.get(resolverName)
+	if err != nil {
+		return nil, err
+	}
+
+	return storedData.Account, nil
+}
+
+// SaveAccount stores ACME Account.
+func (s *LocalStore) SaveAccount(resolverName string, account *Account) error {
+	storedData, err := s.get(resolverName)
+	if err != nil {
+		return err
+	}
+
+	storedData.Account = account
+	s.save(resolverName, storedData)
+
+	return nil
+}
+
+// GetCertificates returns ACME Certificates list.
+func (s *LocalStore) GetCertificates(resolverName string) ([]*CertAndStore, error) {
+	storedData, err := s.get(resolverName)
+	if err != nil {
+		return nil, err
+	}
+
+	return storedData.Certificates, nil
+}
+
+// SaveCertificates stores ACME Certificates list.
+func (s *LocalStore) SaveCertificates(resolverName string, certificates []*CertAndStore) error {
+	storedData, err := s.get(resolverName)
+	if err != nil {
+		return err
+	}
+
+	storedData.Certificates = certificates
+	s.save(resolverName, storedData)
+
+	return nil
+}
+
 func (s *LocalStore) save(resolverName string, storedData *StoredData) {
 	s.lock.Lock()
 	defer s.lock.Unlock()
@@ -121,8 +168,7 @@ func (s *LocalStore) listenSaveAction(routinesPool *safe.Pool) {
 					logger.Error(err)
 				}
 
-				err = os.WriteFile(s.filename, data, 0o600)
-				if err != nil {
+				if err := os.WriteFile(s.filename, data, 0o600); err != nil {
 					logger.Error(err)
 				}
 			}
@@ -132,55 +178,5 @@ func (s *LocalStore) listenSaveAction(routinesPool *safe.Pool) {
 
 // unSafeCopyOfStoredData creates maps copy of storedData. Is not thread safe, you should use `s.lock`.
 func (s *LocalStore) unSafeCopyOfStoredData() map[string]*StoredData {
-	result := map[string]*StoredData{}
-	for k, v := range s.storedData {
-		result[k] = v
-	}
-	return result
-}
-
-// GetAccount returns ACME Account.
-func (s *LocalStore) GetAccount(resolverName string) (*Account, error) {
-	storedData, err := s.get(resolverName)
-	if err != nil {
-		return nil, err
-	}
-
-	return storedData.Account, nil
-}
-
-// SaveAccount stores ACME Account.
-func (s *LocalStore) SaveAccount(resolverName string, account *Account) error {
-	storedData, err := s.get(resolverName)
-	if err != nil {
-		return err
-	}
-
-	storedData.Account = account
-	s.save(resolverName, storedData)
-
-	return nil
-}
-
-// GetCertificates returns ACME Certificates list.
-func (s *LocalStore) GetCertificates(resolverName string) ([]*CertAndStore, error) {
-	storedData, err := s.get(resolverName)
-	if err != nil {
-		return nil, err
-	}
-
-	return storedData.Certificates, nil
-}
-
-// SaveCertificates stores ACME Certificates list.
-func (s *LocalStore) SaveCertificates(resolverName string, certificates []*CertAndStore) error {
-	storedData, err := s.get(resolverName)
-	if err != nil {
-		return err
-	}
-
-	storedData.Certificates = certificates
-	s.save(resolverName, storedData)
-
-	return nil
+	return maps.Clone(s.storedData)
 }