public IObservable <IStreamMessage> LocalHashtagAsObservable(string tag, string host = null)
{
var url = ToUrl(host, "/api/v1/streaming/hashtag/local");
var parameters = new List <KeyValuePair <string, object> > {
new KeyValuePair <string, object>("tag", AppClient.UrlEncode(tag))
};
var connection = new StreamingConnection(Client, url, parameters);
return(connection.Connect());
}