[ NoAccessorMethod ]
public string user_agent { owned get; set; }

User-Agent string to send with HTTP(S) requests, or null to use the default user agent, which is derived from the geocode-glib version and GApplication:id, for example: `geocode-glib/3.20 (MyAppId)`.

As per the [Nominatim usage policy](, it should be set to a string which identifies the application which is using geocode-glib, and must be a valid [user agent]( string.