protected def _post(urls: String,
             params: Map[String, String] = Map(),
             props: Map[String, String] = Map()) : Option[String] =
        {
        val outs = paramStr(params).getBytes
        val url = new java.net.URL(urls)
        val conn = url.openConnection.asInstanceOf[java.net.HttpURLConnection]
        try
            {
            conn.setRequestMethod("POST")
            conn.setDoOutput(true)
            conn.setRequestProperty("Content-Length", outs.length.toString)
            props.foreach(e => conn.setRequestProperty(e._1, e._2))
            conn.getOutputStream.write(outs)
            conn.getOutputStream.close
            Some(read(conn.getInputStream))
            }
        catch
            {
            case e:Exception => error("post: " + e)
                error("post:" + read(conn.getErrorStream))
            None
            }
        }