[ NoAccessorMethod ]
[ Version ( since = "2.30" ) ]
public bool accept_language_auto { get; set; }
If true, [class@Session] will automatically set the string for the "Accept-Language" header on every [ class@Message] sent, based on the return value of [func@GLib.
get_language_names].
Setting this will override any previous value of [property@Session:accept-language].