如何为 HttpWebRequest 或 WebRequest C# 强制使用 ipv6 或 ipv4 [英] How to force ipv6 or ipv4 for HttpWebRequest or WebRequest C#

问题描述

来自 node.js 我可以这样做告诉 node.js 使用 ipv6 和 ipv4 发出请求

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 强制使用 ipv4，将其设置为 6 强制使用 ipv6.不设置它可以让任何一个工作.

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) 中做同样的事情

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

我可以想到一种方法，即自己为 A 或 AAAA 记录发出 DNS 请求，发出直接 IP 请求并设置 host: 标头.有没有更好的办法?

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

你可以使用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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