Replace Split in loops with more efficient SplitSeq

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,