MediaServices.cs

public MediaServices(string tenantDomain, string restApiUrl, string clientId, string clientSecret)
{
    _tenantDomain = tenantDomain;
    _restApiUrl = restApiUrl;
    _clientId = clientId;
    _clientSecret = clientSecret;

    _httpClient = new HttpClient { BaseAddress = new Uri(restApiUrl) };
    _httpClient.DefaultRequestHeaders.Add("x-ms-version", "2.15");
    _httpClient.DefaultRequestHeaders.Add("DataServiceVersion", "3.0");
    _httpClient.DefaultRequestHeaders.Add("MaxDataServiceVersion", "3.0");
    _httpClient.DefaultRequestHeaders.Add("Accept", "application/json;odata=verbose");
}