if (headerList != null) {
                    for (final String[] values : headerList) {
                        logger.fine(() -> ">>> " + values[0] + "=" + values[1]);
                        connection.addRequestProperty(values[0], values[1]);
                    }
                }
                if (compression != null) {
                    connection.setRequestProperty("Accept-Encoding", compression);
                }

                break;
            }
        }
        if (!found) requestProperties.put(key, values);
        connection.setRequestProperty(key, value);
    }

    public void addRequestProperty(String key, String value) {
        if (key == null) throw new NullPointerException();
        List values = null;
        Iterator entries = requestProperties.entrySet().iterator();
        while (entries.hasNext()) {

            }
        }
        if ( !found )
            this.requestProperties.put(key, values);
        this.connection.setRequestProperty(key, value);
    }


    @Override
    public void addRequestProperty ( String key, String value ) {
        if ( key == null )
            throw new NullPointerException();
        List<String> values = null;