while (properties.hasNext()) {
            Map.Entry property = (Map.Entry) properties.next();
            String key = (String) property.getKey();
            StringBuffer value = new StringBuffer();
            Iterator values = ((List) property.getValue()).iterator();
            while (values.hasNext()) {
                value.append(values.next());
                if (values.hasNext()) value.append(", ");
            }

            StringBuffer value = new StringBuffer();
            Iterator<String> values = property.getValue().iterator();
            while ( values.hasNext() ) {
                value.append(values.next());
                if ( values.hasNext() )
                    value.append(", ");
            }
            this.setRequestProperty(key, value.toString());
        }