如何为HttpWebRequest或WebRequest C#强制使用ipv6或ipv4

问题描述

来自node.js，我可以这样做来告诉node.js使用ipv6 vs ipv4进行请求

Coming from node.js I can do this to tell node.js to make the request using ipv6 vs ipv4

var http = require("http");
var options = {
  hostname: "google.com",
  family: 4, // set to 6 for ipv6
};
var req = http.request(options, function(res) {
  .. handle result here ..
});
req.write("");
req.end();

将family设置为4会强制ipv4，将其设置为6会强制ipv6.如果不设置它，任何一个都可以工作.

Setting family to 4 forces ipv4, setting it to 6 forces ipv6. Not setting it lets either work.

如何在C#(.NET 3.5)中执行相同的操作

How can I do the same thing in C# (.NET 3.5)

我可以想到一种方法，自己为自己的A或AAAA记录发出DNS请求，提出直接IP请求并设置host:标头.有更好的方法吗?

I can think of one way which is to make a DNS request myself myself for the A or AAAA records, make a direct IP request and set the host: header. Is there a better way?

推荐答案

您可以使用 ServicePoint.BindIPEndPointDelegate .

var req = HttpWebRequest.Create(url) as HttpWebRequest;

req.ServicePoint.BindIPEndPointDelegate = (servicePoint, remoteEndPoint, retryCount) =>
{
    if (remoteEndPoint.AddressFamily == System.Net.Sockets.AddressFamily.InterNetworkV6)
    {
        return new IPEndPoint(IPAddress.IPv6Any, 0);
    }

    throw new InvalidOperationException("no IPv6 address");
};

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