Ignore certificate errors for KeepAlive task. (#12019)

Author: Paul Johnson

src/Umbraco.Core/Constants-HttpClients.cs

@@ -0,0 +1,19 @@
+namespace Umbraco.Cms.Core
+{
+    /// <summary>
+    /// Defines constants.
+    /// </summary>
+    public static partial class Constants
+    {
+        /// <summary>
+        /// Defines constants for named http clients.
+        /// </summary>
+        public static class HttpClients
+        {
+            /// <summary>
+            /// Name for http client which ignores certificate errors.
+            /// </summary>
+            public const string IgnoreCertificateErrors = "Umbraco:HttpClients:IgnoreCertificateErrors";
+        }
+    }
+}

src/Umbraco.Infrastructure/HostedServices/KeepAlive.cs

@@ -7,6 +7,7 @@
 using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
+using Umbraco.Cms.Core;
 using Umbraco.Cms.Core.Configuration.Models;
 using Umbraco.Cms.Core.Hosting;
 using Umbraco.Cms.Core.Logging;
@@ -99,7 +100,7 @@ public override async Task PerformExecuteAsync(object state)
                 try
                 {
                     var request = new HttpRequestMessage(HttpMethod.Get, keepAlivePingUrl);
-                    HttpClient httpClient = _httpClientFactory.CreateClient();
+                    HttpClient httpClient = _httpClientFactory.CreateClient(Constants.HttpClients.IgnoreCertificateErrors);
                     _ = await httpClient.SendAsync(request);
                 }
                 catch (Exception ex)

src/Umbraco.Web.Common/DependencyInjection/UmbracoBuilderExtensions.cs

@@ -3,6 +3,7 @@
 using System.Data.SqlClient;
 using System.IO;
 using System.Linq;
+using System.Net.Http;
 using System.Reflection;
 using Dazinator.Extensions.FileProviders.GlobPatternFilter;
 using Microsoft.AspNetCore.Builder;
@@ -191,6 +192,11 @@ public static IUmbracoBuilder AddHostedServices(this IUmbracoBuilder builder)
         private static IUmbracoBuilder AddHttpClients(this IUmbracoBuilder builder)
         {
             builder.Services.AddHttpClient();
+            builder.Services.AddHttpClient(Constants.HttpClients.IgnoreCertificateErrors)
+                .ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler
+                {
+                    ServerCertificateCustomValidationCallback = HttpClientHandler.DangerousAcceptAnyServerCertificateValidator
+                });
             return builder;
         }