codeigniter rest server POST "not allowed", but GET works fine

I am using codeigniter-restserver by Phil Sturgeon, https://github.com/chriskacerguis/codeigniter-restserver here is an problem I encountered: When I do PUT request, everything works, but when I do POST, I got "500 Internal Server Error" ``` <div id="container"> <h1>An Error Was Encountered</h1> <p>The action you have requested is not allowed.</p> </div> ``` my code is the following: ``` function test_post() { $this->response('ok', 200); // 200 being the HTTP response code } function test_get() { $this->response('ok', 200); // 200 being the HTTP response code } ``` the working GET handelling can be found in the following URL https://manage.pineconetassel.com/index.php/api/example/test/ NOTE that I allowed https only. I used hurl.it to test the POST method, and it does not work. here is the rest.php config: ``` $config['force_https'] = TRUE; $config['rest_default_format'] = 'json'; $config['rest_status_field_name'] = 'status'; $config['rest_message_field_name'] = 'error'; $config['enable_emulate_request'] = TRUE; $config['rest_realm'] = 'REST API'; $config['rest_auth'] = false; $config['auth_source'] = 'ldap'; $config['auth_library_class'] = ''; $config['auth_library_function'] = ''; $config['rest_valid_logins'] = array('admin' => '1234'); $config['rest_ip_whitelist_enabled'] = false; $config['rest_ip_whitelist'] = ''; $config['rest_ip_blacklist_enabled'] = false; $config['rest_ip_blacklist'] = ''; $config['rest_database_group'] = 'default'; $config['rest_keys_table'] = 'keys'; $config['rest_enable_keys'] = FALSE; $config['rest_key_column'] = 'key'; $config['rest_key_length'] = 40; $config['rest_key_name'] = 'X-API-KEY'; $config['rest_logs_table'] = 'logs'; $config['rest_enable_logging'] = FALSE; $config['rest_access_table'] = 'access'; $config['rest_enable_access'] = FALSE; $config['rest_logs_json_params'] = FALSE; $config['rest_limits_table'] = 'limits'; $config['rest_enable_limits'] = FALSE; $config['rest_ignore_http_accept'] = FALSE; $config['rest_ajax_only'] = FALSE; ``` Did I do something wrong or use a wrong way to test the POST or I need to configure something?