fix: convert '\' to '/' on windows (minio#16852)

cmd/generic-handlers.go

@@ -22,6 +22,7 @@ import (
 	"net"
 	"net/http"
 	"path"
+	"path/filepath"
 	"runtime/debug"
 	"strings"
 	"sync/atomic"
@@ -349,7 +350,7 @@ func hasBadHost(host string) error {
 // Check if the incoming path has bad path components,
 // such as ".." and "."
 func hasBadPathComponent(path string) bool {
-	path = strings.TrimSpace(path)
+	path = filepath.ToSlash(strings.TrimSpace(path)) // For windows '\' must be converted to '/'
 	for _, p := range strings.Split(path, SlashSeparator) {
 		switch strings.TrimSpace(p) {
 		case dotdotComponent: