func RecF(hs *routing.HTTPSession) routing.HResult {
_, sha, _, err := hs.RecF2("file", "/tmp/")
if err == nil {
fmt.Println("receive file:", sha)
return hs.MsgRes(sha)
} else {
fmt.Println("receive file err:", err.Error())
return hs.MsgResErr2(1, "arg-err", err)
}
}