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// FileSystem custom file system handler
type FileSystem struct {
fs http.FileSystem
// Open opens file
func (fs FileSystem) Open(path string) (http.File, error) {
f, err := fs.fs.Open(path)
if err != nil {
return nil, err
s, err := f.Stat()
if s.IsDir() {
index := strings.TrimSuffix(path, "/") + "/index.html"
if _, err := fs.fs.Open(index); err != nil {
return nil, err
return f, nil
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