| settingsId | The settings id useable in the settingsRef attributes of the ivy task that needs a setting.  Note that the ivy tasks will search by default for the settings with the id "ivy.instance", which is the default value. | No, defaults to "ivy.instance" | 
    | file | path to the settings file to use | No. If a file is provided, url is ignored. If none are provided, then it attempts to find a file at ${ivy.settings.file}, and if this file does not exist, it uses ${ivy.settings.url} (since 2.3) or a default settings file | 
    | url | url of the settings file to use | 
    | override | Specify what to do when another settings with the same id has already been loaded. truethe current settings will take precedence over any previously defined setting with this idfalsethe current settings will not override a previously defined setting with this idnotallowedan error is raised if a settings has already been defined with this id
 | No, defaults to "notallowed" | 
    | host | http authentication host | No, unless authentication is required | 
    | realm | http authentication realm | 
    | username | http authentication user name | 
    | passwd | http authentication password |