title: How to use a proxy to access wcf service in .net core
body: <p>I'm add a wcf service in my code(.net core 2.1), but I cann't access this service directly, I need to use a proxy to do this , I don't know how to set proxy in my code. 
  when i add a wcf service, vs generate a json file like this:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>{
    "ProviderId": "Microsoft.VisualStudio.ConnectedService.Wcf",
    "Version": "15.0.20628.921",
    "GettingStartedDocument": {
      "Uri": "https://go.microsoft.com/fwlink/?linkid=858517"
    },
    "ExtendedData": {
      "Uri": "http://xxxxx/eisp-zk/ws/zkiService?wsdl",
      "Namespace": "EispService",
      "SelectedAccessLevelForGeneratedClass": "Public",
      "GenerateMessageContract": false,
      "ReuseTypesinReferencedAssemblies": true,
      "ReuseTypesinAllReferencedAssemblies": true,
      "CollectionTypeReference": {
        "Item1": "System.Array",
        "Item2": "System.Runtime.dll"
      },
      "DictionaryCollectionTypeReference": {
        "Item1": "System.Collections.Generic.Dictionary`2",
        "Item2": "System.Collections.dll"
      },
      "CheckedReferencedAssemblies": [],
      "InstanceId": null,
      "Name": "EispService",
      "Metadata": {}
    }
  }</code></pre>
  </div>
  </div>
  </p>
  
  <p>I want to know how to set a proxy. anyone can help me？</p>