serveError(w, msg, StatusInternalServerError)
				return
			}
			localRedirect(w, r, "../"+base)
			return
		}
	}

	if d.IsDir() {
		url := r.URL.Path
		// redirect if the directory name doesn't end in a slash
		if url == "" || url[len(url)-1] != '/' {
			localRedirect(w, r, path.Base(url)+"/")
			return
		}

		// use contents of index.html for directory, if present