feat: update check

ObservatoryCore/UI/HttpClient.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Net.Http;
+
+namespace Observatory
+{
+    public sealed class HttpClient
+    {
+        private HttpClient()
+        { }
+
+        private static readonly Lazy<System.Net.Http.HttpClient> lazy = new Lazy<System.Net.Http.HttpClient>(() => new System.Net.Http.HttpClient());
+
+        public static System.Net.Http.HttpClient Client
+        {
+            get
+            {
+                return lazy.Value;
+            }
+        }
+
+        public static string GetString(string url)
+        {
+            return lazy.Value.GetStringAsync(url).Result;
+        }
+
+        public static HttpResponseMessage SendRequest(HttpRequestMessage request)
+        {
+            return lazy.Value.SendAsync(request).Result;
+        }
+
+        public static System.Threading.Tasks.Task<HttpResponseMessage> SendRequestAsync(HttpRequestMessage request)
+        {
+            return lazy.Value.SendAsync(request);
+        }
+    }
+}