// part of the URL path, and not indicate the start of a query
		// string or fragment.
		url := url.URL{Path: name}
		fmt.Fprintf(w, "<a href=\"%s\">%s</a>\n", url.String(), htmlReplacer.Replace(name))
	}
	fmt.Fprintf(w, "</pre>\n")
}

// serveError serves an error from ServeFile, ServeFileFS, and ServeContent.
// Because those can all be configured by the caller by setting headers like

		fmt.Fprintln(w, body)
	}
}

var htmlReplacer = strings.NewReplacer(
	"&", "&",
	"<", "&lt;",
	">", "&gt;",
	// "&#34;" is shorter than "&quot;".
	`"`, "&#34;",
	// "&#39;" is shorter than "&apos;" and apos was not in HTML until HTML5.
	"'", "&#39;",
)

func htmlEscape(s string) string {
	return htmlReplacer.Replace(s)
}

// Redirect to a fixed URL