|  |  | 
 |  |  |                      | 
 |  |  |                     using HttpClient httpClient = new HttpClient(); | 
 |  |  |                     httpClient.Timeout = new TimeSpan(0, 0, 60); | 
 |  |  |                     long currentTimestamp = DateTimeOffset.UtcNow.ToUnixTimeSeconds(); | 
 |  |  |                     string key = $"appkey=1830415116987195392×tamp={currentTimestamp}"; | 
 |  |  |                     string authorization = "Open " + GetStr(key); | 
 |  |  |                     string authorization = "AppKey 1830415116987195392"; | 
 |  |  |                     headers = new Dictionary<string, string> | 
 |  |  |                     { | 
 |  |  |                         { "Appkey", "1830415116987195392" }, | 
 |  |  |                         { "Authorization", authorization }, | 
 |  |  |                         { "site_tenant_id", "ced19269-2b83-4577-be43-8cc2f700251e" } | 
 |  |  |                         { "Site_tenant_id", "0dc2d164-8a62-417e-8a00-808007464feb" } | 
 |  |  |                     }; | 
 |  |  |                     if (headers != null) | 
 |  |  |                     { |