Replace Split in loops with more efficient SplitSeq

integration/access_log_test.go

@@ -245,8 +245,8 @@ 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], ",")
+		responseHeaders := strings.SplitSeq(resp.Header["Www-Authenticate"][0], ",")
-		for _, r := range responseHeaders {
+		for r := range responseHeaders {
 			for _, w := range wantedHeaders {
 				if strings.Contains(r, w) {
 					result[w] = strings.Split(r, `"`)[1]

integration/integration_test.go

@@ -409,7 +409,7 @@ func (s *BaseSuite) displayTraefikLog(output *bytes.Buffer) {
 	if output == nil || output.Len() == 0 {
 		log.Info().Msg("No Traefik logs.")
 	} else {
-		for _, line := range strings.Split(output.String(), "\n") {
+		for line := range strings.SplitSeq(output.String(), "\n") {
 			log.Info().Msg(line)
 		}
 	}

pkg/middlewares/accesslog/logger_test.go

@@ -325,7 +325,7 @@ 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
 		}

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/compress/acceptencoding.go

@@ -63,7 +63,7 @@ func parseAcceptableEncodings(acceptEncoding []string, supportedEncodings map[st
 	var encodings []Encoding
 
 	for _, line := range acceptEncoding {
-		for _, item := range strings.Split(strings.ReplaceAll(line, " ", ""), ",") {
+		for item := range strings.SplitSeq(strings.ReplaceAll(line, " ", ""), ",") {
 			parsed := strings.SplitN(item, ";", 2)
 			if len(parsed) == 0 {
 				continue

pkg/middlewares/forwardedheaders/forwarded_header.go

@@ -216,7 +216,7 @@ 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/provider/acme/provider.go

@@ -1088,7 +1088,7 @@ func (p *Provider) certExists(validDomains []string) bool {
 
 func isDomainAlreadyChecked(domainToCheck string, existentDomains []string) bool {
 	for _, certDomains := range existentDomains {
-		for _, certDomain := range strings.Split(certDomains, ",") {
+		for certDomain := range strings.SplitSeq(certDomains, ",") {
 			if types.MatchDomain(domainToCheck, certDomain) {
 				return true
 			}

pkg/provider/kubernetes/ingress-nginx/annotations.go

@@ -92,8 +92,8 @@ func parseIngressConfig(ing *netv1.Ingress) (ingressConfig, error) {
 			if field.Type.Elem().Elem().Kind() == reflect.String {
 				// Handle slice of strings
 				var slice []string
-				elements := strings.Split(val, ",")
+				elements := strings.SplitSeq(val, ",")
-				for _, elt := range elements {
+				for elt := range elements {
 					slice = append(slice, strings.TrimSpace(elt))
 				}
 				cfgValue.Field(i).Set(reflect.ValueOf(&slice))

pkg/provider/kubernetes/ingress-nginx/kubernetes.go

@@ -1128,8 +1128,8 @@ func basicAuthUsers(secret *corev1.Secret, authSecretType string) (dynamic.Users
 	}
 
 	// Trim lines and filter out blanks
-	rawLines := strings.Split(string(authFileContent), "\n")
+	rawLines := strings.SplitSeq(string(authFileContent), "\n")
-	for _, rawLine := range rawLines {
+	for rawLine := range rawLines {
 		line := strings.TrimSpace(rawLine)
 		if line != "" && !strings.HasPrefix(line, "#") {
 			users = append(users, line)

pkg/proxy/fast/proxy.go

@@ -364,7 +364,7 @@ type fasthttpHeader interface {
 // See RFC 7230, section 6.1.
 func removeConnectionHeaders(h fasthttpHeader) {
 	f := h.Peek(fasthttp.HeaderConnection)
-	for _, sf := range bytes.Split(f, []byte{','}) {
+	for sf := range bytes.SplitSeq(f, []byte{','}) {
 		if sf = bytes.TrimSpace(sf); len(sf) > 0 {
 			h.DelBytes(sf)
 		}

pkg/tls/certificate_store.go

@@ -102,7 +102,7 @@ func (c *CertificateStore) GetBestCertificate(clientHello *tls.ClientHelloInfo)
 	matchedCerts := map[string]*CertificateData{}
 	if c.DynamicCerts != nil && c.DynamicCerts.Get() != nil {
 		for domains, cert := range c.DynamicCerts.Get().(map[string]*CertificateData) {
-			for _, certDomain := range strings.Split(domains, ",") {
+			for certDomain := range strings.SplitSeq(domains, ",") {
 				if matchDomain(serverName, certDomain) {
 					matchedCerts[certDomain] = cert
 				}
@@ -157,7 +157,7 @@ func (c *CertificateStore) GetCertificate(domains []string) *CertificateData {
 			}
 
 			var matchedDomains []string
-			for _, certDomain := range strings.Split(certDomains, ",") {
+			for certDomain := range strings.SplitSeq(certDomains, ",") {
 				for _, checkDomain := range domains {
 					if certDomain == checkDomain {
 						matchedDomains = append(matchedDomains, certDomain)