static void Main(string[] args) {
        TestConcurrency().GetAwaiter().GetResult();
    }

    private static async Task TestConcurrency() {
        int threads = 5;
        var tasks = new List<Task>();
        CAPI api = new CAPI("rosette api key");
        foreach (int task in Enumerable.Range(0, threads)) {
            Console.WriteLine("Starting task {0}", task);
            tasks.Add(Task.Factory.StartNew( () => runLookup(task, api) ));
        }
        await Task.WhenAll(tasks);
        Console.WriteLine("Test complete");
    }

    private static Task runLookup(int taskId, CAPI api) {
        int calls = 5;
        string contentUri = "http://www.foxsports.com/olympics/story/chad-le-clos-showed-why-you-never-talk-trash-to-michael-phelps-080916";
        for (int i = 0; i < calls; i++) {
            Console.WriteLine("Task ID: {0} call {1}", taskId, i);
            try {
                var result = api.Entity(contentUri: contentUri);
                Console.WriteLine("Concurrency: {0}, Result: {1}", api.Concurrency, result);
            }
            catch (Exception ex) {
                Console.WriteLine(ex);
            }
        }
        return Task.CompletedTask;
    }

    static void Main(string[] args) {
        TestConcurrency().GetAwaiter().GetResult();
    }

    private static async Task TestConcurrency() {
        int threads = 5;
        var tasks = new List<Task>();

        CAPI api = new CAPI("rosette api key");
        HttpClient client = api.Client;
        foreach (int task in Enumerable.Range(0, threads)) {
            Console.WriteLine("Starting task {0}", task);
            tasks.Add(Task.Factory.StartNew( () => runLookup(task, client) ));
        }
        await Task.WhenAll(tasks);
        Console.WriteLine("Test complete");
    }

    private static Task runLookup(int taskId, HttpClient client) {
        int calls = 5;
        string contentUri = "http://www.foxsports.com/olympics/story/chad-le-clos-showed-why-you-never-talk-trash-to-michael-phelps-080916";
        for (int i = 0; i < calls; i++) {
            Console.WriteLine("Task ID: {0} call {1}", taskId, i);
            try {
                CAPI api = new CAPI("rosette api key", client: client);

                var result = api.Entity(contentUri: contentUri);
                Console.WriteLine("Concurrency: {0}, Result: {1}", api.Concurrency, result);
            }
            catch (Exception ex) {
                Console.WriteLine(ex);
            }
        }
        return Task.CompletedTask;
    }