From 13b9d32cd2c624dc3867b4e5cdf95595fa3153b9 Mon Sep 17 00:00:00 2001
From: MaxDac <massimiliano.dacunzo@hotmail.com>
Date: Wed, 15 Nov 2023 11:28:38 +0000
Subject: [PATCH] Adding Health Checks `HttpClient` definition (#635)

Co-authored-by: Keith Cully <2370032+K-Cully@users.noreply.github.com>
---
 ...ckHttpClientServiceCollectionExtensions.cs | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 src/Diagnostics.HealthChecks/HealthCheckHttpClientServiceCollectionExtensions.cs

diff --git a/src/Diagnostics.HealthChecks/HealthCheckHttpClientServiceCollectionExtensions.cs b/src/Diagnostics.HealthChecks/HealthCheckHttpClientServiceCollectionExtensions.cs
new file mode 100644
index 00000000..a6c8195f
--- /dev/null
+++ b/src/Diagnostics.HealthChecks/HealthCheckHttpClientServiceCollectionExtensions.cs
@@ -0,0 +1,32 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license.
+
+using System.Net.Http;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Microsoft.Omex.Extensions.Diagnostics.HealthChecks;
+
+/// <summary>
+/// A collection of extension methods to define <seealso cref="HttpClient"/> for Health Checks
+/// in the DI.
+/// </summary>
+public static class HealthCheckHttpClientServiceCollectionExtensions
+{
+	/// <summary>
+	/// Defines a <seealso cref="HttpClient"/> in the DI designed for Health Checks.
+	/// The main difference is that these clients in development will ignore SSL errors.
+	/// This is an acceptable compromise considering that the health checks are executed in the same machine
+	/// as the Service Fabric service itself, and that each client will be specifically used for the
+	/// health checks, as the name parameter in input is mandatory.
+	/// Every other uses of this extension methods apart from health checks should be avoided.
+	/// </summary>
+	/// <param name="services">The services.</param>
+	/// <param name="name">The logical name of the <see cref="HttpClient"/> to configure.</param>
+	/// <returns>The <see cref="IHttpClientBuilder"/>.</returns>
+	public static IHttpClientBuilder AddHealthCheckHttpClient(this IServiceCollection services, string name) =>
+		services.AddHttpClient(name)
+			.ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler
+			{
+				ServerCertificateCustomValidationCallback = (_, _, _, _) => true
+			});
+}