文档：管理客户端

Docs/1.2.使用准则.ipynb

@@ -26,7 +26,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": 2,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
@@ -712,7 +712,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 29,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
@@ -724,7 +724,24 @@
      "languageId": "polyglot-notebook"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div><div></div><div></div><div><strong>Installed Packages</strong><ul><li><span>Microsoft.Extensions.Http.Resilience, 8.5.0</span></li><li><span>Polly, 8.4.0</span></li></ul></div></div>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "共有9193个字符\r\n"
+     ]
+    }
+   ],
    "source": [
     "#r \"nuget:Polly\"\n",
     "#r \"nuget:Microsoft.Extensions.Http.Resilience\"\n",

Docs/1.3.0.基础使用.管理客户端.ipynb

@@ -20,7 +20,31 @@
    "source": [
     "HttpClient 旨在实例化一次，并在应用程序的整个生命周期内重复使用。\n",
     "\n",
-    "为实现复用，HttpClient类库默认使用连接池和请求管道，可以再结合IoC容器、工厂模式(提供了IHttpClientFactory类库)、复原库Polly"
+    "为实现复用，HttpClient类库默认使用连接池和请求管道，可以手动管理(连接池、配置管道、使用Polly); 结合IoC容器、工厂模式(提供了IHttpClientFactory类库)、复原库Polly,可以更加方便、完善的使用,这也是推荐的方法。"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "dotnet_interactive": {
+     "language": "csharp"
+    },
+    "polyglot_notebook": {
+     "kernelName": "csharp"
+    },
+    "vscode": {
+     "languageId": "polyglot-notebook"
+    }
+   },
+   "outputs": [],
+   "source": [
+    "//全局设置，行运行一次，为后续准备\n",
+    "#r \"nuget:System.Net.Http.Json\"\n",
+    "#r \"nuget:Microsoft.Extensions.DependencyInjection\"\n",
+    "\n",
+    "global using System.Net.Http;\n",
+    "global using System.Net.Http.Headers;\n"
    ]
   },
   {
@@ -40,6 +64,64 @@
     "## 1、手动管理：直接实例化-强烈不推荐"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "下面这种每次使用都实例化的用法是最常见、最`不推荐的`：\n",
+    "\n",
+    "因为HttpClient刚推出时不成熟及微软官方文档的示例代码是这种用法，再加上这种是最简单方便的使用方法，就造成很多人使用这种用法。\n",
+    "这种方法有如下缺点：\n",
+    "+ 1. 每次使用都实例化，造成性能开销大、容易内存泄露；\n",
+    "+ 2. 并发量大、请求频繁时：网络端口会被耗尽 `Using包HttpClient,也只是在应用进程中释放了HttpClient实例，但http请求/响应是跨操作系统和网络的，而系统及网络问题在进程之上，不是进程所能处理的。`\n",
+    "  \n",
+    "优点：\n",
+    "+ 1. 使用简单，好学易用；\n",
+    "+ 2. 并发量小且请求不频繁时，问题不大；"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "dotnet_interactive": {
+     "language": "csharp"
+    },
+    "polyglot_notebook": {
+     "kernelName": "csharp"
+    },
+    "vscode": {
+     "languageId": "polyglot-notebook"
+    }
+   },
+   "outputs": [],
+   "source": [
+    "/*\n",
+    "    每次请求都实例化：并发量大、请求频繁进会耗尽套接字端口\n",
+    "*/\n",
+    "{ \n",
+    "    using(var client = new HttpClient())\n",
+    "    {\n",
+    "        //发送请求\n",
+    "        var response = await client.GetAsync(\"http://localhost\");\n",
+    "        response.EnsureSuccessStatusCode();\n",
+    "    }\n",
+    "\n",
+    "    //显示句柄\n",
+    "    var displayValue = display($\"第 1 次请求，成功！\");\n",
+    "\n",
+    "    for(int i=0;i<10;i++)\n",
+    "    {\n",
+    "        using(var client = new HttpClient())\n",
+    "        {\n",
+    "            var response = await client.GetAsync(\"http://localhost\");\n",
+    "            response.EnsureSuccessStatusCode();\n",
+    "            displayValue.Update($\"第 {i+1} 次/ 共 10 次请求，成功！\");\n",
+    "        }\n",
+    "    }\n",
+    "}"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -58,7 +140,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## 4、手动管理 + 可复原(Polly)"
+    "## 4、手动管理：可复原(Polly)请求"
    ]
   },
   {

HttpClientStudy.Core/HttpError.cs

@@ -1,6 +1,7 @@
 using HttpClientStudy.Config;
 
 using Microsoft.Extensions.Options;
+using System.Net.Http.Json;
 
 namespace HttpClientStudy.Core
 {