public static async Task <List <Country> > GetCountries()
        {
            List <Country> Contries = new List <Country>();

            string URL = BASE_URL + GET_COUNTRIES_ENDPOINT;

            using (HttpClient client = new HttpClient())
            {
                HttpRequestMessage requestMessage = new HttpRequestMessage(HttpMethod.Get, URL);

                foreach (string[] customHeader in CUSTOM_HEADERS)
                {
                    requestMessage.Headers.Add(customHeader[0].ToString(), customHeader[1].ToString());
                }

                var response = await client.SendAsync(requestMessage);

                string jsonString = await response.Content.ReadAsStringAsync();

                APICountry json = JsonConvert.DeserializeObject <APICountry>(jsonString);

                Contries = json.api.countries;
            }
            return(Contries);
        }
        public async Task <CovidCountry> GetHistoryCountry(string country)
        {
            using (HttpClient client = new HttpClient())
            {
                string requestUri = "https://disease.sh/v3/covid-19/historical/" + country + "?lastdays=all";

                HttpResponseMessage apiResponse = await client.GetAsync(requestUri);

                string jsonResponse = await apiResponse.Content.ReadAsStringAsync();

                APICountry aPICountry = JsonConvert.DeserializeObject <APICountry>(jsonResponse);

                List <string> dateTimes   = new List <string>();
                List <int>    cases       = new List <int>();
                List <int>    deaths      = new List <int>();
                List <int>    casesperday = new List <int>();
                foreach (KeyValuePair <string, int> date in aPICountry.Timeline.Cases)
                {
                    //TODO A faire en revenant sur du DateTime!
                    //dateTimes.Add(DateTime.ParseExact(date.Key, "M/d/yy", System.Globalization.CultureInfo.InvariantCulture));
                    dateTimes.Add(date.Key);
                    cases.Add(date.Value);
                }
                for (var i = 0; i < cases.Count; i++)
                {
                    if (i == 0)
                    {
                        casesperday.Add(0);
                    }
                    else
                    {
                        casesperday.Add(cases[i] - cases[i - 1]);
                    }
                }
                foreach (KeyValuePair <string, int> date in aPICountry.Timeline.Deaths)
                {
                    deaths.Add(date.Value);
                }

                return(new CovidCountry()
                {
                    CountryName = aPICountry.Country, Dates = dateTimes, Cases = cases, Deaths = deaths, CasePerDay = casesperday
                });
            }
        }