SRP violation

public class MailChimpReportsOverview
 {
      /// <summary>
      /// Get MailChimp Campaign Reports
      /// </summary>
      public async Task<ReportOverview> OverviewAsync()
      {
          string method= "reports";
          string server ="us12";
          string endpoint = String.Format("https://{0}.api.mailchimp.com/3.0/{1}", server, method);
          
          string content;
            using (var client = new HttpClient())
            {
                try
                {
                     client.DefaultRequestHeaders.Accept.Clear();
                     client.DefaultRequestHeaders.Authorization =
                         new AuthenticationHeaderValue("Basic", Authenticate.FeatchApiKey());
                
                    content = await client.GetStringAsync(endpoint).ConfigureAwait(false);
                }
                catch (Exception ex)
                {
                    using (StreamWriter file = new StreamWriter("c:\\log.txt",true)
                    {
                      file.WriteLine(ex.ToString());
                    }
                }
            }
        return JsonConvert.DeserializeObject<ReportOverview>(content);
      }
 }