HttpRequestMessage 在多 IP 环境中配置 IP
本文关键字:IP 配置 环境 HttpRequestMessage 在多 | 更新日期: 2023-09-27 18:31:25
>我在主机上有多个IP,想要选择从具有HttpRequestMessage
的HttpClient
建立连接时使用的IP。这可以在不我自己编写套接字和编写一个简单的 http 客户端的情况下完成吗?
我正在寻找一个相当于bind
connect
socket
级别,但对于HttpClient
......或替代方案。
因此,如果您在 Windows 计算机上使用默认的HttpClient
消息处理程序,HttpClient
将使用 .Net HttpWebRequest
来完成其工作。这反过来又依赖于ServicePointManager
来提供管理与 URI 的连接ServicePoint
。对于任何域,都可以挂接到其ServicePoint
以更改其绑定到 IPEndPoint 的方式。
如果您获取要尝试连接的 URI 并找到其ServicePoint
:
var sp = ServicePointManager.FindServicePoint(uri);
然后,您可以:
var sp = ServicePointManager.FindServicePoint(new Uri("http://www.google.com"));
sp.BindIPEndPointDelegate = (servicePoint, remoteEndPoint, retryCount) => {
IPAddress adapterIpAddress = //your chosen adapter's IP address
return new IPEndPoint(adapterIpAddress, 0);
};
如果你想变得非常爵士,你可以把它折叠到一个委托处理程序中,这样HttpClient就会为你处理一切:
public class RebindingHandler : DelegatingHandler
{
private BindIPEndPoint bindHandler;
public RebindingHandler(IEnumerable<IPAddress> adapterAddresses,
HttpMessageHandler innerHandler = null)
: base(innerHandler ?? new WebRequestHandler())
{
var addresses = adapterAddresses.ToList();
if(!addresses.Any())
{
throw new ArgumentException();
}
var idx = 0;
bindHandler = (servicePoint, remoteEndPoint, retryCount) => {
int i = Interlocked.Increment(ref idx);
uint i2 = unchecked((uint)i);
int index = (int)(((long)i2) % addresses.Count);
IPAddress adapterIpAddress = addresses[index];
return new IPEndPoint(adapterIpAddress, 0);
};
}
protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request,
CancellationToken cancellationToken)
{
var sp = ServicePointManager.FindServicePoint(request.RequestUri);
sp.BindIPEndPointDelegate = bindHandler;
var httpResponseMessage = await base.SendAsync(request, cancellationToken);
return httpResponseMessage;
}
}
然后,您可以:
var addresses = new List<IPAddress>(); //this contains your adapter addresses
var client = new HttpClient(new RebindingHandler(addresses));
当您使用 client
时,内部处理程序将自动注册相关的服务点以使用围绕一堆 IPEndPoint 旋转的 BindIPEndPoint。