code: public static String doPost(String host, String path,
                                  Map<String, String> headers,
                                  Map<String, String> queries,
                                  String body) throws Exception {
          return EntityUtils.toString(doPostResponse(host, path, headers, queries, body).getEntity(), "utf-8");
      }
docs: Post String
  
  @param host
  @param path
  @param headers
  @param queries
  @param body
  @return
  @throws Exception