diff --git a/NewLife.Remoting/Clients/ClientBase.cs b/NewLife.Remoting/Clients/ClientBase.cs
index a7e4c6f..b448d5f 100644
--- a/NewLife.Remoting/Clients/ClientBase.cs
+++ b/NewLife.Remoting/Clients/ClientBase.cs
@@ -47,7 +47,7 @@ public abstract class ClientBase : DisposeBase, ICommandClient, IEventProvider,
     /// <summary>收到命令时触发</summary>
     public event EventHandler<CommandEventArgs>? Received;
 
-    /// <summary>命令前缀</summary>
+    /// <summary>命令前缀。默认Device/</summary>
     public String Prefix { get; set; } = "Device/";
 
     /// <summary>协议版本</summary>
@@ -84,7 +84,6 @@ protected override void Dispose(Boolean disposing)
     /// <param name="args">参数</param>
     /// <param name="cancellationToken"></param>
     /// <returns></returns>
-    [return: MaybeNull]
     public abstract Task<TResult> OnInvokeAsync<TResult>(String action, Object? args, CancellationToken cancellationToken);
 
     /// <summary>远程调用拦截，支持重新登录</summary>
diff --git a/NewLife.Remoting/Clients/HttpClientBase.cs b/NewLife.Remoting/Clients/HttpClientBase.cs
index e638ac6..89e973a 100644
--- a/NewLife.Remoting/Clients/HttpClientBase.cs
+++ b/NewLife.Remoting/Clients/HttpClientBase.cs
@@ -1,5 +1,4 @@
-using System.Diagnostics.CodeAnalysis;
-using NewLife.Caching;
+using NewLife.Caching;
 using NewLife.Log;
 using NewLife.Remoting.Models;
 using NewLife.Serialization;
@@ -20,24 +19,32 @@ public class HttpClientBase : ClientBase
     /// </summary>
     public ApiHttpClient Client => _client;
 
-    private MyHttpClient _client = null!;
-    private ICache _cache = new MemoryCache();
+    private readonly ApiHttpClient _client;
+    private readonly ICache _cache = new MemoryCache();
     #endregion
 
     #region 构造
     /// <summary>实例化</summary>
     public HttpClientBase() : base()
     {
-        _client = new MyHttpClient
+        _client = new ApiHttpClient
         {
-            Client = this,
             Log = XTrace.Log
         };
     }
 
     /// <summary>实例化</summary>
     /// <param name="urls"></param>
-    public HttpClientBase(String urls) : this()
+    public HttpClientBase(String urls) : this() => AddServices(urls);
+
+    /// <summary>新增服务点</summary>
+    /// <param name="name"></param>
+    /// <param name="url"></param>
+    public void AddService(String name, String url) => _client.Add(name, new Uri(url));
+
+    /// <summary>根据服务端地址列表新增服务点集合</summary>
+    /// <param name="urls"></param>
+    public void AddServices(String urls)
     {
         if (!urls.IsNullOrEmpty())
         {
@@ -48,11 +55,6 @@ public HttpClientBase(String urls) : this()
             }
         }
     }
-
-    /// <summary>新增服务点</summary>
-    /// <param name="name"></param>
-    /// <param name="url"></param>
-    public void AddService(String name, String url) => _client.Add(name, new Uri(url));
     #endregion
 
     #region 方法
@@ -61,7 +63,6 @@ public HttpClientBase(String urls) : this()
     /// <param name="args">参数</param>
     /// <param name="cancellationToken"></param>
     /// <returns></returns>
-    [return: MaybeNull]
     public override Task<TResult> OnInvokeAsync<TResult>(String action, Object? args, CancellationToken cancellationToken)
     {
         if (args == null || action.StartsWithIgnoreCase("Get") || action.Contains("/Get"))
@@ -70,15 +71,6 @@ public override Task<TResult> OnInvokeAsync<TResult>(String action, Object? args
             return _client.PostAsync<TResult>(action, args);
     }
 
-    class MyHttpClient : ApiHttpClient
-    {
-        public HttpClientBase Client { get; set; } = null!;
-
-        public Service? Current { get; private set; }
-
-        protected override Service GetService() => Current = base.GetService();
-    }
-
     /// <summary>设置令牌。派生类可重定义逻辑</summary>
     /// <param name="token"></param>
     protected override void SetToken(String? token)
diff --git a/NewLife.Remoting/Clients/RpcClientBase.cs b/NewLife.Remoting/Clients/RpcClientBase.cs
index a94432f..ceb2ffa 100644
--- a/NewLife.Remoting/Clients/RpcClientBase.cs
+++ b/NewLife.Remoting/Clients/RpcClientBase.cs
@@ -39,7 +39,6 @@ public RpcClientBase(String urls) : this()
     /// <param name="args">参数</param>
     /// <param name="cancellationToken"></param>
     /// <returns></returns>
-    [return: MaybeNull]
     public override async Task<TResult> OnInvokeAsync<TResult>(String action, Object? args, CancellationToken cancellationToken)
     {
         return await _client.InvokeAsync<TResult>(action, args, cancellationToken);
diff --git a/Samples/IoTZero/Clients/HttpDevice.cs b/Samples/IoTZero/Clients/HttpDevice.cs
index bdb25f9..99efa69 100644
--- a/Samples/IoTZero/Clients/HttpDevice.cs
+++ b/Samples/IoTZero/Clients/HttpDevice.cs
@@ -22,13 +22,13 @@ public class HttpDevice : HttpClientBase
     #region 构造
     public HttpDevice() => Prefix = "Device/";
 
-    public HttpDevice(ClientSetting setting) : base(setting.Server)
+    public HttpDevice(ClientSetting setting) : this()
     {
-        Prefix = "Device/";
-
         _setting = setting;
 
         ProductKey = setting.ProductKey;
+
+        AddServices(setting.Server);
     }
     #endregion