Self-contained export (#321)

DiscordChatExporter.Domain/Internal/Singleton.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Net;
+using System.Net.Http;
+
+namespace DiscordChatExporter.Domain.Internal
+{
+    internal static class Singleton
+    {
+        private static readonly Lazy<HttpClient> LazyHttpClient = new Lazy<HttpClient>(() =>
+        {
+            var handler = new HttpClientHandler();
+
+            if (handler.SupportsAutomaticDecompression)
+                handler.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
+
+            handler.UseCookies = false;
+
+            return new HttpClient(handler, true);
+        });
+
+        public static HttpClient HttpClient { get; } = LazyHttpClient.Value;
+    }
+}