+ *
+ * For remote calls, you may need to set the UserAgent and Referer strings for some environments (eg WordFence)
+ * Add 'referer' and 'useragent' to the initialisation config:
+ *
+ * ```
+ * $api = new civicrm_api3 (['server' => 'http://example.org',
+ * 'api_key'=>'theusersecretkey',
+ * 'key'=>'thesitesecretkey',
+ * 'referer'=>'https://my_site',
+ * 'useragent'=>'curl']);
+ * ```