use HttpClientFactory and Polly

framework/Volo.Abp.sln

@@ -1,4 +1,4 @@
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
 VisualStudioVersion = 15.0.28307.168
 MinimumVisualStudioVersion = 10.0.40219.1

framework/src/Volo.Abp.AspNetCore.TestBase/Volo/Abp/AspNetCore/TestBase/DynamicProxying/AspNetCoreTestDynamicProxyHttpClientFactory.cs

@@ -8,15 +8,20 @@ namespace Volo.Abp.AspNetCore.TestBase.DynamicProxying
     public class AspNetCoreTestDynamicProxyHttpClientFactory : IDynamicProxyHttpClientFactory, ITransientDependency
     {
         private readonly ITestServerAccessor _testServerAccessor;
+        private readonly IHttpClientFactory _httpClientFactory;
 
-        public AspNetCoreTestDynamicProxyHttpClientFactory(ITestServerAccessor testServerAccessor)
-        {
+        public AspNetCoreTestDynamicProxyHttpClientFactory(ITestServerAccessor testServerAccessor, IHttpClientFactory httpClientFactory) {
             _testServerAccessor = testServerAccessor;
+            _httpClientFactory = httpClientFactory;
         }
 
         public HttpClient Create()
         {
             return _testServerAccessor.Server.CreateClient();
         }
+
+        public HttpClient Create(string name) {
+            return Create();
+        }
     }
 }

framework/src/Volo.Abp.Http.Client.IdentityModel/Volo/Abp/Http/Client/IdentityModel/IdentityModelRemoteServiceHttpClientAuthenticator.cs

@@ -28,7 +28,7 @@ namespace Volo.Abp.Http.Client.IdentityModel
                 var accessToken = await GetAccessTokenFromHttpContextOrNullAsync();
                 if (accessToken != null)
                 {
-                    context.Client.SetBearerToken(accessToken);
+                    context.Request.SetBearerToken(accessToken);
                     return;
                 }
             }

framework/src/Volo.Abp.Http.Client/Microsoft/Extensions/DependencyInjection/ServiceCollectionDynamicHttpClientProxyExtensions.cs

@@ -3,6 +3,7 @@ using System.Linq;
 using System.Reflection;
 using Castle.DynamicProxy;
 using JetBrains.Annotations;
+using Polly;
 using Volo.Abp;
 using Volo.Abp.Castle.DynamicProxy;
 using Volo.Abp.Http.Client;
@@ -106,6 +107,12 @@ namespace Microsoft.Extensions.DependencyInjection
                 options.HttpClientProxies[type] = new DynamicHttpClientProxyConfig(type, remoteServiceConfigurationName);
             });
             
+            //use IHttpClientFactory and polly
+            services.AddHttpClient(remoteServiceConfigurationName)
+                .AddTransientHttpErrorPolicy(builder =>
+                    // retry 3 times
+                    builder.WaitAndRetryAsync(3, i => TimeSpan.FromSeconds(Math.Pow(2, i))));
+
             var interceptorType = typeof(DynamicHttpProxyInterceptor<>).MakeGenericType(type);
             services.AddTransient(interceptorType);
 

framework/src/Volo.Abp.Http.Client/Volo.Abp.Http.Client.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <Import Project="..\..\..\common.props" />
 
@@ -15,6 +15,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.Authentication.Abstractions" Version="2.2.0" />
+    <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="2.2.0" />
   </ItemGroup>
 
   <ItemGroup>

framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/DefaultDynamicProxyHttpClientFactory.cs

@@ -5,9 +5,21 @@ namespace Volo.Abp.Http.Client.DynamicProxying
 {
     public class DefaultDynamicProxyHttpClientFactory : IDynamicProxyHttpClientFactory, ITransientDependency 
     {
+        private readonly IHttpClientFactory _httpClientFactory;
+
+        public DefaultDynamicProxyHttpClientFactory(IHttpClientFactory httpClientFactory) 
+        {
+            _httpClientFactory = httpClientFactory;
+        }
+
         public HttpClient Create() 
         {
-            return new HttpClient();
+            return _httpClientFactory.CreateClient();
+        }
+
+        public HttpClient Create(string name) 
+        {
+            return _httpClientFactory.CreateClient(name);
         }
     }
 }

framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/DynamicHttpProxyInterceptor.cs

@@ -127,12 +127,12 @@ namespace Volo.Abp.Http.Client.DynamicProxying
         }
 
         private async Task<string> MakeRequestAsync(IAbpMethodInvocation invocation)
-        {
-            using (var client = HttpClientFactory.Create())
         {
             var clientConfig = ClientOptions.HttpClientProxies.GetOrDefault(typeof(TService)) ?? throw new AbpException($"Could not get DynamicHttpClientProxyConfig for {typeof(TService).FullName}.");
             var remoteServiceConfig = RemoteServiceOptions.RemoteServices.GetConfigurationOrDefault(clientConfig.RemoteServiceName);
 
+            var client = HttpClientFactory.Create(clientConfig.RemoteServiceName);
+
             var action = await ApiDescriptionFinder.FindActionAsync(remoteServiceConfig.BaseUrl, typeof(TService), invocation.Method);
             var apiVersion = GetApiVersionInfo(action);
             var url = remoteServiceConfig.BaseUrl + UrlBuilder.GenerateUrlWithParameters(action, invocation.ArgumentsDictionary, apiVersion);
@@ -162,7 +162,7 @@ namespace Volo.Abp.Http.Client.DynamicProxying
 
             return await response.Content.ReadAsStringAsync();
         } 
-        }
+        
 
         private ApiVersionInfo GetApiVersionInfo(ActionApiDescriptionModel action)
         {

framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/IDynamicProxyHttpClientFactory.cs

@@ -5,5 +5,7 @@ namespace Volo.Abp.Http.Client.DynamicProxying
     public interface IDynamicProxyHttpClientFactory
     {
         HttpClient Create();
+
+        HttpClient Create(string name);
     }
 }