C#

public class TweetsService : RestServiceBase<Tweets>
{
	public ICacheClient Cache { get; set; }
	
	public object OnGet(Tweets request)
	{
		var tweets = this.Cache.Get<List<Tweets>>("yourkey");
		if(tweets == null)
		{
			tweets = LoadTweetsFromExternalService();
			this.Cache.Add<List<Tweets>>("yourkey", tweets);
		}
		return tweets.Take(request.Count);
	}
}

test.cs

public class TweetsService : RestServiceBase<Tweets>
{
	public ICacheClient Cache { get; set; }
	
	public object OnGet(Tweets request)
	{
		var tweets = this.Cache.Get<List<Tweets>>("yourkey");
		if(tweets == null)
		{
			tweets = LoadTweetsFromExternalService();
			this.Cache.Add<List<Tweets>>("yourkey", tweets);
		}
		return tweets.Take(request.Count);
	}
}