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   "source": [
    "# HttpClient 处理错误与异常"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "根据客户端的创建方法不周，有不同的错误与异常处理方式。推荐类型化客户端、工厂和Polly库中统一处理！"
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   "source": [
    "## 初始化"
   ]
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      "text/markdown": [
       "## 初始化\n",
       "这是全局共用文件，包括Nuget包引用、全局类库引用、全局文件引用、全局命名空间引用、全局变量、全局方法、全局类定义等功能。\n",
       "\n",
       "在业务笔记中引用，执行其它单元格之前先执行一次。"
      ]
     },
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      "text/html": [
       "<div><div></div><div></div><div><strong>Installed Packages</strong><ul><li><span>Microsoft.Extensions.DependencyInjection, 9.0.4</span></li><li><span>Microsoft.Extensions.Http, 9.0.4</span></li><li><span>Microsoft.Extensions.Http.Polly, 9.0.4</span></li><li><span>Microsoft.Extensions.Logging, 9.0.4</span></li><li><span>Microsoft.Extensions.Logging.Console, 9.0.4</span></li><li><span>Microsoft.Net.Http.Headers, 9.0.4</span></li><li><span>Polly, 8.5.2</span></li><li><span>Refit, 8.0.0</span></li><li><span>Refit.HttpClientFactory, 8.0.0</span></li><li><span>System.Net.Http.Json, 9.0.4</span></li></ul></div></div>"
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     "text": [
      "配置文件根目录：c:\\Users\\ruyu\\Desktop\\HttpClientStudy\\Docs\\Publish\\HttpClientStudy.Core\n",
      "配置文件根目录：c:\\Users\\ruyu\\Desktop\\HttpClientStudy\\Docs\\Publish\\HttpClientStudy.Core\n",
      "启动WebApi项目...\n",
      "程序[c:\\Users\\ruyu\\Desktop\\HttpClientStudy\\Docs\\Publish\\HttpClientStudy.WebApp\\HttpClientStudy.WebApp.exe]已在新的命令行窗口执行。如果未出现新命令行窗口，可能是程序错误造成窗口闪现！\n",
      "已启动WebApi项目,保持窗口打开状态！\n",
      "初始化完成！\n"
     ]
    }
   ],
   "source": [
    "#!import ./Ini.ipynb"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 常规方法 try catch"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "直接实例化客户端时，可以用`Try Catch`简单处理,这种是最不推荐的方式！"
   ]
  },
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   "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",
    "    var baseUrl = WebApiConfigManager.GetWebApiConfig().BaseUrl;\n",
    "\n",
    "    using(var client = new HttpClient())\n",
    "    {\n",
    "        //发送请求\n",
    "        var response = await client.GetAsync(baseUrl);\n",
    "        response.EnsureSuccessStatusCode();\n",
    "    }\n",
    "\n",
    "    //显示句柄\n",
    "    var displayValue = display($\"第 0 次请求，成功！\");\n",
    "\n",
    "    for(int i=0;i<10;i++)\n",
    "    {\n",
    "        using(var client = new HttpClient())\n",
    "        {\n",
    "            var response = await client.GetAsync(baseUrl);\n",
    "            response.EnsureSuccessStatusCode();\n",
    "            displayValue.Update($\"第 {i+1} 次/ 共 10 次请求，成功！\");\n",
    "        }\n",
    "    }\n",
    "}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 静态或工具类中处理"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 类型化客户端中处理"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 在管道中，添加异常中间件"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 工厂模式中统一处理"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Polly库处理"
   ]
  }
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