01 .NET CORE 2.2 使用OCELOT -- 簡單使用

　　目前參考兩篇文章，已實現基本的ocelot的網關功能。

　　https://www.cnblogs.com/xlxr45/p/11320988.html

　　https://www.jianshu.com/p/c967eda8b04d

　　按照第一篇的操作，ocelot的網關宿主為cmd，因為本想用webapi項目引用ocelot實現網關功能，配置文件有點出入。

　　後來搜索查到第二篇。簡單修改下配置，configuration.json 如下

{
  "ReRoutes": [
    {
      "DownstreamPathTemplate": "/api/customers",
      "DownstreamScheme": "http",
      "DownstreamHostAndPorts": [
        {
          "Host": "localhost",
          "Port": 9001
        }
      ],
      "UpstreamPathTemplate": "/customers",
      "UpstreamHttpMethod": [ "Get" ]
    },
    {
      "DownstreamPathTemplate": "/api/customers/{id}",
      "DownstreamScheme": "http",
      "DownstreamHostAndPorts": [
        {
          "Host": "localhost",
          "Port": 9001
        }
      ],
      "UpstreamPathTemplate": "/customers/{id}",
      "UpstreamHttpMethod": [ "Get" ]
    },
    {
      "DownstreamPathTemplate": "/api/products",
      "DownstreamScheme": "http",
      "DownstreamHostAndPorts": [
        {
          "Host": "localhost",
          "Port": 9002
        }
      ],
      "UpstreamPathTemplate": "/api/products",
      "UpstreamHttpMethod": [ "Get" ]
    }
  ]
}

　　修改三個項目的啟動宿主為iisexpress、埠等，併在解決方案中設置為多項目啟動。

　　VS按F5啟動，可以看到同時啟動三個項目