if err != nil {
log.Println("error", r.RemoteAddr, "pypi", filename, "download", err)
http.Error(w, err.Error(), http.StatusBadGateway)
if err != nil {
log.Println("error", r.RemoteAddr, "pypi", filename, "download", err)
http.Error(w, err.Error(), http.StatusBadGateway)