Implemented HttpContextCancellationTokenProvider.

src/Volo.Abp.AspNetCore/Volo.Abp.AspNetCore.csproj.DotSettings

@@ -0,0 +1,2 @@
+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:String x:Key="/Default/CodeInspection/CSharpLanguageProject/LanguageLevel/@EntryValue">CSharp71</s:String></wpf:ResourceDictionary>

src/Volo.Abp.AspNetCore/Volo/Abp/AspNetCore/Threading/HttpContextCancellationTokenProvider.cs

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+using System.Threading;
+using Microsoft.AspNetCore.Http;
+using Volo.Abp.DependencyInjection;
+using Volo.Abp.Threading;
+
+namespace Volo.Abp.AspNetCore.Threading
+{
+    [Dependency(ReplaceServices = true)]
+    public class HttpContextCancellationTokenProvider : ICancellationTokenProvider, ITransientDependency
+    {
+        public CancellationToken Token => _httpContextAccessor.HttpContext?.RequestAborted ?? default;
+
+        private readonly IHttpContextAccessor _httpContextAccessor;
+
+        public HttpContextCancellationTokenProvider(IHttpContextAccessor httpContextAccessor)
+        {
+            _httpContextAccessor = httpContextAccessor;
+        }
+    }
+}