# isFeatureSupported method

1. @protected

Future <bool> isFeatureSupported(

1. String xmlns

)

Resolves to true when the server supports the disco feature `xmlns`. Resolves to false when either the disco request fails or the server does not support `xmlns`. Note that this function requires a registered DiscoManager.

## Implementation

    @protected
    Future<bool> isFeatureSupported(String xmlns) async {
      final dm = _managerAttributes.getManagerById<DiscoManager>(discoManager);
      assert(
        dm != null,
        'The DiscoManager must be registered for isFeatureSupported to work',
      );

      final result = await dm!.discoInfoQuery(
        _managerAttributes.getConnectionSettings().jid.toDomain(),
      );
      if (result.isType<DiscoError>()) {
        return false;
      }

      return result.get<DiscoInfo>().features.contains(xmlns);
    }