}
				if strings.HasPrefix(hash, vers) || strings.HasPrefix(vers, hash) {
					best = m.Version
				}
			}
		}
		if best != "" {
			vers = best
		}
	}

	a, err := readArchive(path, vers)
	if err != nil {
		if testing.Verbose() {
			fmt.Fprintf(os.Stderr, "go proxy: no archive %s %s: %v\n", path, vers, err)
		}
		if errors.Is(err, fs.ErrNotExist) {
			http.NotFound(w, r)
		} else {