Single use HttpClient

Author: paulomorgado

HttpClientFactoryDemo.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30403.11
+MinimumVisualStudioVersion = 15.0.26124.0
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "HttpClientFactoryDemo", "HttpClientFactoryDemo\HttpClientFactoryDemo.csproj", "{FF8724C6-05D5-42FD-BCEA-2347C8D0612F}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{FF8724C6-05D5-42FD-BCEA-2347C8D0612F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FF8724C6-05D5-42FD-BCEA-2347C8D0612F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FF8724C6-05D5-42FD-BCEA-2347C8D0612F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FF8724C6-05D5-42FD-BCEA-2347C8D0612F}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {5FC435FF-34F9-4FC5-8FA1-DF3168700212}
+	EndGlobalSection
+EndGlobal

HttpClientFactoryDemo/HttpClientFactoryDemo.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Worker">
+
+  <PropertyGroup>
+    <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;net5.0</TargetFrameworks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="3.1.6" />
+    <PackageReference Include="System.Net.Http" Version="4.3.4" Condition="'$(TargetFramework)' == 'net48'" />
+  </ItemGroup>
+</Project>

HttpClientFactoryDemo/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+
+namespace HttpClientDemo
+{
+    public static class Program
+    {
+        public static async Task Main(string[] args)
+        {
+            await Host.CreateDefaultBuilder(args)
+                .ConfigureServices((hostContext, services) =>
+                    {
+                        services.AddHostedService<Worker>();
+                    })
+                .RunConsoleAsync();
+        }
+    }
+}

HttpClientFactoryDemo/Properties/launchSettings.json

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+{
+  "profiles": {
+    "HttpClientDemo": {
+      "commandName": "Project",
+      "environmentVariables": {
+        "DOTNET_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

HttpClientFactoryDemo/Worker.cs

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+using System;
+using System.Linq;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace HttpClientDemo
+{
+    public class Worker : BackgroundService
+    {
+        private readonly ILogger<Worker> logger;
+
+        public Worker(ILogger<Worker> logger)
+        {
+            this.logger = logger;
+        }
+
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            while (!stoppingToken.IsCancellationRequested)
+            {
+                this.logger.LogInformation("Worker running at: {time}", DateTimeOffset.Now);
+
+                try
+                {
+                    await Task.WhenAll(Enumerable.Range(0, 250).Select(_ => GetData(stoppingToken)));
+                }
+                catch (Exception ex)
+                {
+                    this.logger.LogError(ex, "Worker failed at: {time}", DateTimeOffset.Now);
+                }
+            }
+        }
+
+        private async Task GetData(CancellationToken stoppingToken)
+        {
+            using (var httpClient = GetHttpClient())
+            {
+                try
+                {
+                    var response = await httpClient.GetAsync("http://bing.com/", stoppingToken);
+                    this.logger.LogDebug("{StatusCode}", response.StatusCode);
+                }
+                catch (Exception ex)
+                {
+                    this.logger.LogError("{ExceptionType}: {ExceptionMessage}", ex.GetType().Name, ex.Message);
+
+                    if (!(ex.InnerException is null))
+                    {
+                        this.logger.LogError("{InnerExceptionType}: {InnerExceptionMessage}", ex.InnerException.GetType().Name, ex.InnerException.Message);
+                    }
+                }
+            }
+        }
+
+        private HttpClient GetHttpClient()
+        {
+            var httpClient = new HttpClient();
+            return httpClient;
+        }
+    }
+}

HttpClientFactoryDemo/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  }
+}

HttpClientFactoryDemo/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  }
+}