code: function (view, engine = 'html') {
  	return async function DefaultView (ctx, next) {
  		await ctx.render(`${view}.${engine}`);
  	};
  }
docs: Creates a default handler for the route (render html view)
  @private
  @param {string} view - Default view name
  @param {string} engine - Default engine extension
  @return {async function(ctx: KoaContext, next: KoaNext)} renders the view