Introduced IUnsubscriptionService and replaced the usage in rendering page view model.

Wino.Core/CoreContainerSetup.cs

@@ -37,6 +37,7 @@ namespace Wino.Core
             services.AddTransient<IAutoDiscoveryService, AutoDiscoveryService>();
             services.AddTransient<IContextMenuItemService, ContextMenuItemService>();
             services.AddTransient<IFontService, FontService>();
+            services.AddTransient<IUnsubscriptionService, UnsubscriptionService>();
 
             services.AddTransient<OutlookThreadingStrategy>();
             services.AddTransient<GmailThreadingStrategy>();

Wino.Core/Services/UnsubscriptionService.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Net.Http;
+using System.Text;
+using System.Threading.Tasks;
+using Serilog;
+using Wino.Core.Domain.Interfaces;
+using Wino.Core.Domain.Models.Reader;
+
+namespace Wino.Core.Services
+{
+    public class UnsubscriptionService : IUnsubscriptionService
+    {
+        public async Task<bool> OneClickUnsubscribeAsync(UnsubscribeInfo info)
+        {
+            try
+            {
+                using var httpClient = new HttpClient();
+
+                var unsubscribeRequest = new HttpRequestMessage(HttpMethod.Post, info.HttpLink)
+                {
+                    Content = new StringContent("List-Unsubscribe=One-Click", Encoding.UTF8, "application/x-www-form-urlencoded")
+                };
+
+                var result = await httpClient.SendAsync(unsubscribeRequest).ConfigureAwait(false);
+
+                return result.IsSuccessStatusCode;
+            }
+            catch (Exception ex)
+            {
+                Log.Error("Failed to unsubscribe from {HttpLink} - {Message}", info.HttpLink, ex.Message);
+            }
+
+            return false;
+        }
+    }
+}