Support multiple `PreActions`.

framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/AbpHttpClientOptions.cs

@@ -10,11 +10,17 @@ public class AbpHttpClientOptions
 {
     public Dictionary<Type, HttpClientProxyConfig> HttpClientProxies { get; set; }
 
-    public Dictionary<string, Action<HttpClientProxyConfig, ClientProxyRequestContext, HttpClient>> ProxyHttpClientPreSendActions { get; }
+    public Dictionary<string, List<Action<HttpClientProxyConfig, ClientProxyRequestContext, HttpClient>>> ProxyHttpClientPreSendActions { get; }
 
     public AbpHttpClientOptions()
     {
         HttpClientProxies = new Dictionary<Type, HttpClientProxyConfig>();
-        ProxyHttpClientPreSendActions = new Dictionary<string, Action<HttpClientProxyConfig, ClientProxyRequestContext, HttpClient>>();
+        ProxyHttpClientPreSendActions = new Dictionary<string, List<Action<HttpClientProxyConfig, ClientProxyRequestContext, HttpClient>>>();
+    }
+
+    public AbpHttpClientOptions AddPreSendAction(string remoteServiceName, Action<HttpClientProxyConfig, ClientProxyRequestContext, HttpClient> action)
+    {
+        ProxyHttpClientPreSendActions.GetOrAdd(remoteServiceName, () => new List<Action<HttpClientProxyConfig, ClientProxyRequestContext, HttpClient>>()).Add(action);
+        return this;
     }
 }

framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/ClientProxying/ClientProxyBase.cs

@@ -146,7 +146,7 @@ public class ClientProxyBase<TService> : ITransientDependency
         HttpResponseMessage response;
         try
         {
-            foreach (var preSendAction in ClientOptions.Value.ProxyHttpClientPreSendActions.Where(x => x.Key  == clientConfig.RemoteServiceName).Select(x => x.Value))
+            foreach (var preSendAction in ClientOptions.Value.ProxyHttpClientPreSendActions.Where(x => x.Key  == clientConfig.RemoteServiceName).SelectMany(x => x.Value))
             {
                 preSendAction(clientConfig, requestContext, client);
             }

framework/test/Volo.Abp.Http.Client.Tests/Volo/Abp/Http/AbpHttpClientTestModule.cs

@@ -1,9 +1,11 @@
 using System;
 using System.Collections.Generic;
+using System.Net.Http;
 using Microsoft.Extensions.DependencyInjection;
 using Volo.Abp.AspNetCore.Mvc;
 using Volo.Abp.Http.Client;
 using Volo.Abp.Http.Client.ClientProxying;
+using Volo.Abp.Http.Client.Proxying;
 using Volo.Abp.Http.DynamicProxying;
 using Volo.Abp.Http.Localization;
 using Volo.Abp.Localization;
@@ -64,7 +66,7 @@ public class AbpHttpClientTestModule : AbpModule
 
         Configure<AbpHttpClientOptions>(options =>
         {
-            options.ProxyHttpClientPreSendActions.Add("Default", (_, requestContext, httpclient) =>
+            options.AddPreSendAction("Default", (_, requestContext, httpclient) =>
             {
                 if (requestContext.Action.Name.Equals("TimeOutRequestAsync"))
                 {